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Kenwood KAC-8405

360W 4-Channel Performance Series Amplifier

Discontinued
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This item has been discontinued

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Kenwood KAC-8406

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Kenwood KAC-8405

360W 4-Channel Performance Series Amplifier

$119.99

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Small Universal Remote Level Bass Control

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Kenwood KAC-8405

KAC Car Amplifiers

Reliable Output

An important element to class AB amplifiers is clean output with high efficiency. These two factors were highly considered in the engineering of the Kenwood KAC-8405. Highly rated signal to noise ratio and total harmonic distortion showcase this amplifiers signal processing and clean output. In some cases these factors wouldn’t mean much because the amplifier may generate plenty of heat over time and cause it to constantly shut off. In order to maximize total efficiency, the Kenwood KAC-8405 has had cleverly incorporated self activating fans to help quickly dissipate heat. This prevents damage to your amplifiers internals and also protects the amplifier from constantly going into self-protection mode.

With rated output levels of 60 watts to 4 Channels at 4 Ohms, and 90 watts to 4 Channels at 2 Ohms, this amplifier can truly output clean class AB signal without distorting and overheating. To achieve higher power output, the Kenwood KAC-8405 can also bridge two channels together to even power more demanding applications. This effectively allows the amplifier for 4, 3, and even 2 channel operations! Built into a compact, brushed metal chassis this amplifier even gives off an appearance of staying cool even in the harshest environments.


General Features:

  • 4-Channel Performance Series Class AB Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 4 chan.
    • 2 ohms: 90 watts x 4 chan.
    • Bridged, 4 ohms: 180 watts x 2 chan.
  • Max power output: 720 Watts
  • MOSFET power supply
  • LED power indicators
  • 4/3/2 channel operation
  • Speaker-level inputs
  • Input sensitivity control
  • Bass boost switch
  • Short circuit, DC offset, overload, and thermal protection circuitry
  • Signal sensing turn-on
  • Cast aluminum heat sink design
  • Built-in cooling fan
  • Gold-plated RCA level inputs
  • Gold-plated screw terminals
  • Single side exposure of terminals for multi-installation
  • Variable high-pass filter (50-200 Hz, 12 dB/octave)
  • Variable low-pass filter (50-200 Hz, 12 dB/octave)
  • CEA-2006 compliant amplifier
  • Frequency response: 50-200 Hz
  • Dimensions: 11"L x 2-5/16"H x 9-3/8"D
  • 8-gauge power and ground leads recommended. Contact us for information regarding a discount on a select amplifier kit when purchased together.
  • 1-year Sonic Electronix warranty

Product History:

Kenwood KAC-8406 thumbnail
(newest, current model)
Kenwood KAC-8405 thumbnail
(previous model, replaced by Kenwood KAC-8406)
Kenwood KAC-8404 thumbnail
(previous model, replaced by Kenwood KAC-8405)
Kenwood KAC-8403 thumbnail
(previous model, replaced by Kenwood KAC-8404)
Kenwood KAC-8402 thumbnail
(previous model, replaced by Kenwood KAC-8403)
Kenwood KAC-8401 thumbnail
(previous model, replaced by Kenwood KAC-8402)

Power Specifications - Full Range Channels

RMS Power @ 4 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 4 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

60 watts x 4 channels
RMS Power @ 2 ohms

The RMS power rating is the measure of continuous power that an amplifier can output, or a speaker can handle. It is the most accurate depiction of real, continuous power that the industry has so far.

If the final impedance of your speakers or subwoofers equals 2 ohms, this is how much power this amplifier will supply at that ohm level. The higher the RMS wattage, the more clean and loud your music will sound.

90 watts x 4 channels
Bridged RMS Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the RMS power created once an amplifier is bridged.

180 watts x 2 channels

Power Specifications - Full Range Channels

Peak Power @ 4 ohms
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 2 ohms
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 1 ohm
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Bridged Peak/Max Power

Bridging refers to combining two channels on an amplifier to create one channel with double the voltage and an increased power output. A 2-channel amplifier will bridge down to 1-channel and a 4-channel amplifier can bridge to create 2-channels. An amplifier is most commonly bridged to drive a subwoofer.

Remember, once you bridge two channels down to one its final impedance will be 4 ohms unless otherwise specified. This rating lists the Peak/Max power created once an amplifier is bridged.

Power Specifications - Subwoofer Channel

Peak Power @ 4 ohm
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 2 ohms
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Peak Power @ 1 ohm
This form of power rating refers to the maximum amount of power an electronic device can handle or output in an instant without damage occurring. Often times this maximum is achieved during a brief musical burst, such as a drum accent, or low bass hit.

Some manufacturers display peak power ratings on the face of their products to increase the appeal to consumers. The RMS power rating is more accurate, and we recommend using it for product comparison. However, some manufacture's do not provide an RMS figure and therefore one cannot be advertised.

Amplifier Specifications

Amplifier Series
This designates the series of the amplifier. Many amps are available in a litany of different wattage and channel configurations, but maintain consistent features throughout the product line.
Performance (Kenwood)
Amplifier Class

An amplifier increases the power of the signal being fed to it by taking energy from its power supply and matching the signal but increasing its amplitude. Amplifiers use many different methods for converting these electrical signals and have been categorized into classes.

Class A/B: Greater than 50% of the input signal is amplified while the other percentage is “off”. These amplifiers have a small amount of current flowing through the output transistors all the time which almost eliminates crossover distortion. Class A/B has great sound quality but is not as efficient as class D. These amps are most commonly used to drive speakers.

Class D: Also known as switching amplifiers, class D amps have output transistors that are completely turned “on” or “off”. This means that when the transistors are on, there is almost no voltage across them but when they are off there is significant voltage but no current flowing through it which makes these amplifiers very efficient at the cost of sound quality. These amps are most commonly used to drive subwoofers.

Other Classes: You may see classes such as GH, bD, X, FD, etc. by some manufactures. These amplifiers tend to be either class A/B, D or a hybrid of the two but with improvements to their designs that can make them more efficient or offer better sound quality.

AB
Number of Channels
Each channel on an amplifier will power one speaker using a positive and negative cable. There are various types of amplifiers, each designed to power a certain number of speakers. Monoblock amplifiers, also known as single channel, are designed to power one or more subwoofers. These amplifiers often have very high power ratings. On the other hand, multi-channel amplifiers power multiple speakers, usually at lower power ratings. 2-Channel and 4-Channel amplifiers can power car speakers or low powered subwoofers. Occasionally you might see a 5 or 6-channel amplifier that can power speakers and subwoofers at the same time. The most common setup is a monoblock amp to run subwoofers and a 4-channel amp to run door speakers. Check out our Knowledge Base for more information.
4
Total Peak Power Output
The total peak power output is measured as the wattage per channel multiplied by the number of channels, and is calculated at the lowest level of operating impedance.

It is measured during a brief musical burst, such as a sudden drum accent. Some manufacturers display peak power ratings on the face of their products to increase the appeal.

The RMS power rating is more accurate, and we recommend using it for product comparison.

720 watts
Total RMS Power Output
Total RMS power is measured by multiplying RMS power per channel by the number of channels, and is calculated at the lowest level of operating impedance.

RMS power is the amount of continuous power, measured in watts, that an amplifier produces is called RMS power. The higher the RMS figure, the louder and cleaner your music sounds.

The RMS output figure is much more accurate than the peak rating when comparing products.

360 watts
Maximum Input Gauge Size
This is the largest gauge wire that will fit into the power and ground terminals of this device. The lower the gauge number, the thicker the wire is. For example, a 4 gauge wire is thicker than an 8 gauge wire and thus has higher current carrying capacity. Always do your best to get this size wire to reduce the risk of damage to your components.
8 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
2 ohms
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
4 ohms
THD at Rated RMS Power
The amount of change in harmonic content of the signal as it is amplified. A lower figure indicates less change and a more accurate amp. THD below 0.10% is inaudible.
0.8%
Speaker Level Inputs
Speaker level inputs are commonly referred to as high-level inputs and vice versa. This input type allows you to get your audio signal directly from the speaker wire in your vehicle, instead of using RCA cables. The advantage of this is factory integration, as most stock radios do not have RCA outputs to run amplifiers.
Yes
Preamp Outputs
Many amplifiers are equipped with RCA preamp outputs which pass the original music signal from the source to additional amplifiers. This is known as daisy chaining because the source connects to the first amp, and the first amp connects to the second amp, etc. The advantage to daisy chaining is you only need one 2-channel RCA cable to transfer the signal from the head-unit to the amplifier, and then one additional cable for each amp being daisy chained.
1 pair
Built-in Crossover

A crossover is a type of filtering system that permits only certain frequencies to play. A Low-Pass (LP) crossover allows only frequencies below its setting to get through which is good in the case of some subwoofers. A High-Pass(HP) filter allows frequencies above its setting to pass through, this is normally used on speakers.

When a crossover is set to FULL it means no filtering is added and the full frequency spectrum is allowed through the amplifier. Filtering is important because feeding a speaker frequencies it cannot reproduce effectively creates distortion.

Low-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency
The high-pass crossover frequency can be a fixed crossover point or a variable crossover range. A variable high-pass crossover allows you to select a specific crossover point which allows frequencies above the set crossover point to pass, while making frequencies below the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 200 Hz
Low-Pass Crossover Frequency
The low-pass crossover frequency is typically used for subwoofers. It can be a fixed crossover point or a variable crossover range. A variable low-pass crossover allows you to select a specific crossover point which allows frequencies below the set crossover point to pass, while making frequencies above the set point gently or harshly roll-off, depending on the steepness of the slope.

The steepness of the roll-off slope is measured in dB/octave and refers to the rate of attenuation (lowering of volume) outside their pass bands.

50 - 200 Hz
Signal-to-Noise Ratio
This spec compares the strength of the signal to the level of background noise. A higher value indicates less background noise.
100 dB
Bass Boost
The objective of the bass boost is to get more kick out of your subwoofer. It is a circuit that emphasizes the lower frequencies at a given point. The bass boost should always be set first before setting the gain. This feature is known for destroying subwoofers and is commonly used incorrectly, so be cautious.
0 - 18 dB
Bass/Gain Remote
If the amp comes with a bass/gain remote you will be able to control the level of your bass from your dashboard. Typically bass remotes also include a 16-20 ft. wire for installation.
No
Fan Cooled
A great feature to have if an amp generates a large amount of heat. Cooling fans can help regulate the temperature to prevent the amp from overheating (burning).
Yes
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
40A x 1 
CEA-2006 Compliant
Amplifiers that have been tested to meet specific standards. When a car amplifier meets these standards, you can be sure that it will be able to produce the amount of power specified by the official CEA-2006 rating. Usually, these rating consist of the following items:
  • RMS Power
  • Signal-to-Noise Ratio

This rating applies to both external car amplifiers, as well as the amplifiers inside of in-dash stereos.

Yes
Sonic Certified Amplifier
Sonic Certified amplifiers have been tested by the experts at Sonic Electronix to meet or exceed the wattage ratings provided by the manufacturer. If this is marked as Yes, then you can trust the wattage ratings. If marked as No, then we have tested the amplifier and it did not meet the advertised wattage ratings. If marked as Not Tested, then the Sonic Electronix experts have not yet been able to test the amp.
Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
71%
4 Star
18%
3 Star
6%
2 Star
0%
1 Star
4%

Average Attribution Rating

Durability
4.6
Value
4.7
Features
4.4
Design
4.5
Usability
4.6
Chris

East Bethel, MN

Overall
Durability
Value
Features
Design
Usability
worth the money

September 20, 2013

I am very satisfied with this amp it didn't cost much for what you get out of it. The only thing bad about it is that it only has a bass boost on 2 of the 4 channels otherwise its great, best amp I have ever bought for that price range

18 of 27 found this helpful

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cesar

las vegas, NV

Overall
Durability
Value
Features
Design
Usability
KENWOOD IS GREAT!

September 10, 2011

First of all this amp is well worth the money. I know kenwood is not known for their amps, but this is the second kenwood amp i have purchased and so far i like them. Don't get me wrong... these are great for the money! The settings are easy to work with and the amp comes with fans! i live in Las vegas and it gets HOT! the fans have kicked in but the amp has never gone into protect mode and im only powering some alpine type R's, makes them loud with out hurting the ears.

13 of 17 found this helpful

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Brian

griswold, ct

Overall
Durability
Value
Features
Design
Usability
Great amp, packed with features

November 28, 2012

I bought this amp about 5 months ago as part of a stock equipment upgrade for my Hyundai Sonata
It's worked flawlessly since. It's compact size fits under my passenger seat. I used the included speaker level inputs to hook into the stock stereo which was fairly easy with the included directions, but very time consuming.
I listen at high volumes quite often and this amp takes it easily. I have it hooked to Boston Acoustic components in the front and 2-ways in the rear. It's crystal clear. It also offers a lot of flexibility for tweaking your sound with the crossovers built in.
I've owned several Kenwood products over the years and have never had a problem.
I highly recommend this amp.

16 of 24 found this helpful

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Ross

Beaver County, Pennsylvania

Overall
Durability
Value
Features
Design
Usability
BEST AMP IN THE CLASS!

March 23, 2011

This amp is one of the SMALLEST 4 channel amps i have ever seen...Not only the size but this is one of the most powerful in its size...this is my third amplifier on the setup i have in my car, Infinity Kappa front and rear and this little amp really kicks all the other out the window! I will buy another one for my other car, its that good....Most amazing 4 channel amplifier ive ever heard this size. To all other reviews that say it gets "SO HOT" or whatever, it says in the manual if it is not installed correctly it will over heat and it also states during normal operations may cause burns. so it is normal AND it DOES have twin fans. The only amp in its class that ive owned that does not shut down at too loud of a volume for long periods of use. These other reviews are very vague and do not give this amplifier enough credit and are only acceptable if they are comparing this to a 500$ Kappa amp which i doubt they have as they just bought one at 1/5th the price so if you ask me i would say they are amateurs that dont know how to tune an amp in correctly because trust me this one is worth every cent. I would buy 5 just for future cars if i could. 100% quality...kenwood out did their selves and sold me to all of their other products with just this amplifier! A sony xplod amplifier deserves the ratings from the others on here as this one deserves a perfect 5. (upgraded from an xplod 600w to this and yeah its that big a difference... this will NOT shut down crank it all the way up!

15 of 24 found this helpful

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Marvin

La Palma, CA

Overall
Durability
Value
Features
Design
Usability
Very nice amp

June 1, 2011

Got this amp to power Polk DB651, and DB6501. Sounds are crisp, and clear. Absolutely no signs of over heating. Amp is still cool to the touch after an hour of solid play. Set up took about 20 min and I haven't touched it since. Great little amp!

13 of 22 found this helpful

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Mark

Yulee, FL

Overall
Durability
Value
Features
Design
Usability
Excellent Choice!

November 11, 2012

It gave me the boost I needed to hear my music above any wind noise with my windows and sunroof open in my HHR. Installation was very easy and 'tuning' it was easier yet. I liked the fact it has a cooling fan when so many amps in this price/power range rely solely on heat sinks. Its operation is seamless when it is powering on or off via the automatic sensing circuitry, no popping. HIGHLY RECOMMEND!

10 of 17 found this helpful

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Ruben

HARKER HEIGHTS, TX

Overall
Durability
Value
Features
Design
Usability
Great amp at a Great Price

February 16, 2012

This amp's price was right and had lots of spunk.

6 of 10 found this helpful

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LAMONT CRANSTON

Canada

Overall
Durability
Value
Features
Design
Usability
GOOD BANG FOR YOUR BUCK

January 12, 2012

I bridged it for two Alpine subwoofers in my fleetwood and had no problem with this amp.

6 of 10 found this helpful

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Terry

Visalia, CA

Overall
Durability
Value
Features
Design
Usability
Produce great sounds

June 20, 2011

Item was easy to install and adjust with great sound.

11 of 20 found this helpful

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DBK

Bakersfield,Ca.

Overall
Durability
Value
Features
Design
Usability
Compack

May 17, 2011

It's nice and small you can put it any where you want to if you don't want anyone to see it. And it's easy set it up not to complated is to wire it up and ajusted and your done and price you can't get no better that. So to me is very good and simple and thank you good day.

11 of 20 found this helpful

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Vassago

Texas

Overall
Durability
Value
Features
Design
Usability
Kenwood power in 2010 camaro powering Infinity Reference separates

November 8, 2013

This unit provides clean power and definitive notes in your music. It cranks out crisp sound. The downside is the constant "whir" of the built in fans. Even mounted in the trunk, under the deck lid the "whir" can be detected between tracks or low levels. Not a deal breaker just a notable caution for those that might consider mounting this unit in the passenger compartment- I wouldn't do that!! Other than this little annoyance this is a solidly built unit, limited adjust-ability. The fans will likely add to the lifespan and keep this unit operable for years. In use time, 1 month.

9 of 17 found this helpful

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Daniel

Squaw Valley, CA

Overall
Durability
Value
Features
Design
Usability
Worth every pinny.

June 21, 2013

I am not a big stereo guy but I am glad I got this amp. It sounds great with the speakers I got. I installed it in my wife's F250 crew cab. She love's the way it sound's. I did run new speaker wire from the amp to the speaker's.

9 of 17 found this helpful

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clutchman22

Riverton, Utah

Overall
Durability
Value
Features
Design
Usability
Great Value!

July 30, 2012

I was looking to replace my amp that burned up after 10 years of use. It was a Kenwood also. I had great use out of it and wanted to find something close. This Kenwood KAC-8405 was the answer. It was easy to hook up and sounds just like my old one. The price was right and I'm very pleased with it.

9 of 17 found this helpful

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Richard

Sandwich, MA

Overall
Durability
Value
Features
Design
Usability
Great Amp for tight spots and provides adequate power for the no so "Big" system

April 5, 2011

I have a 4 door Dakota and needed an amp that would fit in a tight area not much height and wasn't looking to rattle the cars next to me. And this amp fit perfectly powers 2 set of Infinity speakers with plenty of volume and no distortion.

4 of 7 found this helpful

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Lee

Antrim, NH

Overall
Durability
Value
Features
Design
Usability
GREAT

March 30, 2014

Love kenwood and there quality this amp in my tundra is incredible..5 stars

9 of 18 found this helpful

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Scott

Mesa, AZ

Overall
Durability
Value
Features
Design
Usability
Kenwood value

September 17, 2013

I bought this amp to add a little bass to my basic setup. for this price level, it's hard to find a more powerful amp with a cooling fan especially important in Phoenix!
The sound is clean and there are ample controls on the unit for High pass/Low pass, volume level, crossover frequency etc.
I was disappointed that it did not come with a bass knob but the head unit I purchased has easy access to sub level so it wasn't an issue. I guess most people don't run these in three channel mode as I do.
Provides plenty of power for my Saturn and old ears. I recommend.

12 of 24 found this helpful

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Donovan

COLUMBIA, SC

Overall
Durability
Value
Features
Design
Usability
Awesome

August 2, 2013

I have never been disappointed with a Kenwood product. Greatly improved sound

6 of 12 found this helpful

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Kristian

Wichita, KS

Overall
Durability
Value
Features
Design
Usability
Very Goodamp for the price

May 17, 2013

I love this amp,matched with the channel kenwood andworked great together.for the price its hard to beat

5 of 10 found this helpful

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Tye Dye

Hot Springs, Arkansas

Overall
Durability
Value
Features
Design
Usability
Great addition.

March 11, 2013

I recently added this amp to my car and what a difference it makes. I have had my deck amped before but I do not remember it having the clarity this amp provides. Like all upgrades, I started with Kenwood Speakers. I can max out the volume and I still have clean and clear tunes. I had the volume all the way up and for the fun of it I honked my horn, and could barely hear it. I luv this amp. I'm saving up for a sub next. Looking forward to completing my upgrade.

9 of 18 found this helpful

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Bill

Richmond, VA

Overall
Durability
Value
Features
Design
Usability
Great amp

October 21, 2012

This Kenwood amp rocks! Have had Alpine and Jensen amps and they always would overheat and cutout at higher volumes. This Kenwood just keeps jamming. Powering 2 Polk components and 2 coaxial Polks with Kenwood HD receiver, running through Kicker 4g wires and 12g speaker wires.

7 of 14 found this helpful

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ahl395

Brick, NJ

Overall
Durability
Value
Features
Design
Usability
Awesome Amp!

June 17, 2012

Amazing amp! Highly recommended. Works PERFECTLY and sounds great. Much smaller than I anticipated escpecially for a 4 channel amp, but dont let it fool you, this thing packs a ton of power, and looks awesome too! Definitely buy it!

7 of 14 found this helpful

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Jay

Mountain Home, AR

Overall
Durability
Value
Features
Design
Usability
Great for mids and highs

February 24, 2012

This is the best amp possible if your running kenwood system, everything is clear and crisp and i can max volume and still hear everything clear with no distortion.

4 of 8 found this helpful

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Richard

Ferguson, MO

Overall
Durability
Value
Features
Design
Usability
Sounds Good

August 15, 2011

Nice Amp, but I almost liked the KAC 6404 Better (at this point) Hard to get the Filters etc correct. At this point, it does not have the Depth the 6404 had, and does not sound much louder

6 of 12 found this helpful

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john

Victoria, TX

Overall
Durability
Value
Features
Design
Usability
Poor Quality

July 19, 2011

I had this amp for maybe two months before it broke. I took it apart and found that many of the solder joints inside had broken. This was easy to fix and the amp worked again for about a month or so. Then the amp had the same problem again and I repaired it, this time it worked for about a week at which point it had some other issue which I could not repair and will no longer power on.

This Amp worked really well and sounded pretty good when it did work but I guess it is just not made durable enough to take the vibrations from my subs. Do not mount on or near your sub box if you purchase this amp!

8 of 16 found this helpful

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mudstock

Des Moines, IA

Overall
Durability
Value
Features
Design
Usability
Great Amplifier!!!

April 14, 2011

I bought this amp to replace an X Thunder amp. I wish I would've bought this one in the first place! The highs are crisper and cleaner, and with the fans, I've never had it shut down. I would'nt hesitate to buy another one!

3 of 6 found this helpful

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Denny

Kutztown, PA

Overall
Durability
Value
Features
Design
Usability
very good 4 channel

March 22, 2011

powerful 4 channel amp. easy install. great hookups. and works like its supposed to . a++

4 of 8 found this helpful

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Michael

Mount Juliet, TN

Overall
Durability
Value
Features
Design
Usability
Good little amp

March 20, 2011

Owned one and loved it. Sold to a friend & he loves it. Have put one in wife's car and another friend. All are happy and made there 6.5 comp & coaxials scream.

Pro: Easy to install. Easy to set up and make sound good. Fan is also great. It never gets warm. Will install under just about any seat. Have run CDT cox-622 which take 90w rms and made them rock!!!
Con; Have not been able to find one.

3 of 6 found this helpful

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Thad

Canyon, TX

Overall
Durability
Value
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price is great

November 7, 2010

for the price this amp is great, good sound quality and output, dont like the position of the controls for gain, hpf/lpf etc, the way its set up in my car you have to unscrew the amp to adjust them unless you do it blind

3 of 6 found this helpful

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Lsxtrkiller

Bakersfield, Ca

Overall
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Value
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Usability
great amp

August 2, 2010

I got this amp a few days ago i have it hooked up to a pair of alpine component type Rs in the front and i have it wired to a 2 ohm 12" kenwood sub in the trunk and am planing upon hooking up a pair of polks for the back seat... it puts out fairly good power and is using a lot less of my cars electrical system then did the alpine amp i had of the same size... Although i must say it gets far hotter and i'm concerned that the thermal shutdown may not work i ran it hard for about an hour and a half and it was hot enough to blister my wrist i would not recommend installing this amp under a seat or similar location it needs plenty of air...

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Carlos

Santa Ana, California

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Value
Features
Design
Usability
amp 4 highs

May 25, 2010

Before I was told about this Kenwood amp in person I was gonna decide between a JL Audio, MB Quart, Hifonics or an Alpine amp. I then compared it to others within it's class and this one was more convincing and less money!! I have it hooked up to my 5.25" Focal component system and it sounds great! 60 watts RMS @ 4ohms sounds like a little, but is more than enough clean power needed for those highs and the chicks everywhere on the streets always turn around and dance to my music!!

5 of 10 found this helpful

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Lance

Deepwater, MO

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Value
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Design
Usability
Kenwood KAC-8405 Review

October 14, 2013

So far excellent product. Does not miss a beat. If something goes wrong I will let ya know.

8 of 17 found this helpful

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Kisha

Maywood, IL

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Durability
Value
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Love it

September 17, 2013

I love it. ITs a little bigger than what I thought it wold be, but over all it preforms the way I expected it to.

9 of 19 found this helpful

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Matthew

Goldsboro, NC

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Value
Features
Design
Usability
Great 4 speaker amp

September 17, 2013

Installed this in my Dodge Charger with two 6x9 rear speakers and two 6.5in components in the front. All Kenwood system and has crystal clear sound even to the peak gain point.

3 of 7 found this helpful

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joe

Snoqualmie, WA

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Value
Features
Design
Usability
True Power

August 16, 2013

I matched this up with a Kenwood head unit into 6 mids totally too loud at max volume. Tuning was a breeze. If your for an affordable crystal clear amp I would highly recommend.

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Former Kenwood fan

Keller, TX

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Durability
Value
Features
Design
Usability
Over rated performance!!!

February 7, 2013

I'm old school and remember when Kenwood meant quality at a reasonable price. Not so much now. On the positive side it is an inexpensive amp, on the negative side, you aren't going to be happy with the power of this amp. It barely powers one Boston Acoustics sub. A major positive is that you don't have to worry about going deaf from to much volume coming out of this amp :) Looks good, but no power - you be the judge. I suggest looking elsewhere within Sonic. They are a great company with a great selection!

6 of 13 found this helpful

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Bronz

Philadelphia, MS

Overall
Durability
Value
Features
Design
Usability
great amp

December 26, 2011

I got this amp from Amazon. The power hook ups seem fairly small but I guess the sound is what's important. This thing works VERY WELL WELL. I RECOMMEND IT! MAKE SURE YOU HAVE SPADE CONNECTORS THOUGH!!

4 of 9 found this helpful

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Jon

Edmond, OK

Overall
Durability
Value
Features
Design
Usability
No issues

October 6, 2011

I have no issues with this amp. Was decently priced and cleared up the limitations of my head unit. I installed it under my seat and I have no issue with it over heating even after hours of playing at a high volume.

I would buy recommend this amp to friends that needed a small boost over their head units. Not many bells and whistles but that's the way I prefer since I would rather my other components handle the crossover.

I did like the line inputs so it could be installed without an aftermarket head unit.

5 of 11 found this helpful

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David

Jacksonville, NC

Overall
Durability
Value
Features
Design
Usability
a good amp for my modest system

October 3, 2011

I would recommend this amp if you want a reliable amp for a moderate sound system. I definitely love the looks of it, and why don't all amplifiers have fans on them? I ran mine with 4 gauge wire, even though I believe they only recommend 8 gauge, plus it gives me a little room for future upgrades. I installed this in my 2001 Jetta, under the rear deck so it has plenty of air circulation, and easy to get to for tweaking.

3 of 7 found this helpful

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julian

Junction City, KS

Overall
Durability
Value
Features
Design
Usability
Great buy for door speakers

June 17, 2011

Why wouldn't you buy this amp to power your speakers? Makes my alpines sound so clear its not even funny.

3 of 7 found this helpful

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Nolan double-u

Richland Center Wisconsin

Overall
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Value
Features
Design
Usability
Pretty good amp

July 19, 2010

This amp works wonderfully and actually puts out the power that it says it does surprisingly. I have to hooked up to two memphis pr-15 10 inch subwoofers (bridged) and it drives them great. I recommend it because of the value and power and all that jazz. Great amp for great price. Only thing about it though is it heats up because it has no fan or at least not a very good one and it's not very stable bridged. good value though buy it and you'll be happy.

4 of 9 found this helpful

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BIG p

ARLINGTON

Overall
Durability
Value
Features
Design
Usability
YES

January 2, 2014

YES it is a great amp. Very, very, easy set up.

4 of 10 found this helpful

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Ozzie

Durham, NC

Overall
Durability
Value
Features
Design
Usability
powerful compact 4 channel amp at a great price.

September 24, 2013

I use this amp to push 2 6x9s and 1 12inch sub bridged with the amp half way. The sound is crisp and clear. I have pumped this amp hard non stop on five hour road trips without any problems.

4 of 10 found this helpful

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Josh

McMinnville, TN

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Durability
Value
Features
Design
Usability
Great amp!

July 23, 2012

I have one of these amps in my truck and another in my car and they are fantastic. Very powerful and reliable. You just can't beat it for the money

7 of 16 found this helpful

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Jesse

El Paso TX

Overall
Durability
Value
Features
Design
Usability
Great amp for the money

July 18, 2012

I have used it in Texas heat during the summer, no problems at all. Easy install and adjustment. Good clear reproduction for the money spent. Overall a great value.

5 of 12 found this helpful

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Lucas

Victoria, TX

Overall
Durability
Value
Features
Design
Usability
It's a beast

March 6, 2012

I have had this amp in for 2 years. I have floated down the river with it, taken it to BBQ cook-offs in the closed ice chest in 110 degree heat, and banged it around all with no problems. It has plenty of power to push by Polk 6x9's and I have the other two channels bridged to a soundstream 10" sub. I am buying this amp again for a friend who wants an ice chest radio too.

3 of 8 found this helpful

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Joshua

Holden, LA

Overall
Durability
Value
Features
Design
Usability
Best Bang For The Buck!

October 1, 2012

When I first bought the amp wasn't sure if it was going to get the job done. Boy was I wrong! I've had nothing but great things to say about the amp. They make my highs and mids sound loud and clear without the 1st sign of overheating. I would recommend this product for anyone that wants big beautiful sound for a small price. Thanks Sonic Electronix for this great amp at a great price!

3 of 9 found this helpful

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El Abuelo

Dallas, TX

Overall
Durability
Value
Features
Design
Usability
Alright amp.

September 5, 2011

This amp will improve over a headunit but not by much. I used to have a crunch 900. That amp was way louder and better. This amp does get hot, real hot like a skillet so be careful. Overall decent but not all that.

4 of 12 found this helpful

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Toplait

Clinton, Mo

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Durability
Value
Features
Design
Usability
Kenwod Review

September 17, 2013

Let me start off by saying I replaced the 1600 BAMF 4 channel with this Kenwood...I'm glad I did.

This amp does not get hot and puts out as much power or maybe even more then the BAMF. This is a great amp for cramped spaces. I placed mine under the seat.

It is kind of noisy if you have the stereo turned off or down to maybe 1 on the volume you can hear the 2 fans keeping the amp cool.

The sound is clear and crisp even at full volume on my head set....Although I have the amp set at a little less then half gain and my head set adjusted way low on some of the settings because my pioneer door speakers can not handle the power of the amp. =)

This amp is difficult to switch some of the settings. You will need to use a small screw driver the size of a tooth pick to switch some settings...Once you get it set then you pretty much don't have to worry about the settings again..

There is a Allen wrench you will have to use to take the dust cover off the amp that protects all the input wires to install to the amp.

For the price this is a great amplifier that puts out.

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Tran

centreville, VA

Overall
Durability
Value
Features
Design
Usability
Great budget amp

January 31, 2012

I have this powering infinity 6012 comps and a single image dynamics 10" sub. I had to fiddle with the x-over points and eventually had to turn on bass boost and turn my gain down but I have it set correctly now where I can crank my system and it is crystal clear. I had a 3 hour road trip and had my music cranking and windows down the whole time and no problems.

I elected to wire it up using the speaker cables instead of RCA and have no problems with popping. I can hear the fan slightly in the trunk after turning my car off but it's really not an issue.

This is a great little amp for a budget system and I am very happy with it. I wish it had more power but for what I paid I am completely satisfied.

11 of 27 found this helpful

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Browse 1 question and 1 answer
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what is the best way to set the amp up for two speakers?
kenny T on Jul 31, 2014
Best Answer: Hello,

It really depends what your application is. If the speakers you are referring to are simply asking for ~60w RMS @ 4ohms each, then you can give each one its Own channel. If, however, they're asking for ~180w RMS @ 4ohms each, then you will bridge the channels.

If you are referring to the SETTINGS, then that comes down to preference and what the setup is. You will want to do your own homework, however, as its going to be very difficult to go in-depth within a small Product Thread like this one.
Reply · Report · Customer SStaff on Aug 13, 2014
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Product Summary

Manufacturer

Model Number

KAC-8405

UPC

019048186485

Weight

9.00lbs

Internal SKU

kac8405

Internal Product ID

22573

Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Kenwood KAC-8405