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Infinity KAPPA FOUR

1200W Kappa Series 4-Channel Amplifier

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List price $549.95

$249.99

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Bundled Savings with this Product

=

25% Off a 4 Gauge Amp Kit with Purchase!

Save 25% off the Belva BAK44 install kit, you will need an amp kit to install your amp, and this the perfect kit for your amp!

12.50

17780

292

Infinity KAPPA FOUR

$249.99

+

25% OFF

Belva BAK44

$49.99

Special Price $37.49 ($49.99 if purchased separately)

Belva BAK44

• Complete 4 Gauge 4-Channel Amplifier Installation Kit
• Designed Specifically For Car Audio Systems Up to 1000 Watts RMS
• Premium Power and Ground Wire Provides Optimal Power Transfer

(Offer 1 of 1)

Combined Total Price

$287.48

You Save $12.50

  • Infinity KAPPA 4-Channel Class D Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 125 watts x 4 chan.
    • 2 ohms: 150 watts x 4 chan.
    • Bridged, 4 ohms: 300 watts x 2 chan.
  • Max power output: 300 watts x 4 chan.
  • DirectFET transistors for increased power output
  • Remote bass level input (remote level control sold separately
  • LED power indicators for DC output, over/under voltage, and Short circuit protection
  • Tuned Bass EQ (0-12 dB bass boost at 50 Hz)
  • High-power class D circuit topology
  • 4/3/2 Channel operation
  • Speaker-level inputs
  • 3-Way Smart System Protection
  • Heavy duty heatsink for extreme heat dissipation
  • RCA level inputs
  • Screw terminals
  • Variable high-pass filter (32-320 Hz, 12 dB/octave)
  • Variable low-pass filter (32-320 Hz, 12 dB/octave)
  • Frequency response: 10-75,000 Hz
  • Dimensions: 13"D x 7-1/16"W x 1-3/4"H
  • 4-gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits when purchased together with this amplifier.
  • Authorized Internet Dealer
  • 3-year Manufacturer's warranty

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.

125 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.

150 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.

300 watts x 2 channels
Peak Power Output
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.

300 watts x 4 channels

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.
Kappa (Infinity)
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.

D
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.

1200 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.

600 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.
4 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.
1%
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.
No
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)
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.

32 - 320 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.

32 - 320 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.
85 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 - 12 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).
No
Fuse Rating
The amperage and the number of fuse(s) an amp requires.
40A x 2 
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

Warranty and Return Policy

Parts Warranty Duration
3 years
Labor Warranty Duration
3 years
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
90%
4 Star
5%
3 Star
0%
2 Star
5%
1 Star
0%

Average Attribution Rating

Durability
4.6
Value
4.7
Features
5.0
Design
4.9
Usability
4.9

Chris

Texas

Overall
Durability
Value
Features
Design
Usability

Great!!!

June 9, 2014

I have had the amp for 4-5 mouths. No problems or issues. I would buy it again!

0 of 0 found this helpful

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Creighton

South Pasadena, CA

Overall
Durability
Value
Features
Design
Usability

Amazing

February 9, 2014

This amp is solid!! If the missing piece of your puzzle is an amp then look no further. I dont brag on shops often, but Sonic is the place to get your stuff. These guys know their s-it!! I explained what I had and what I wanted and they got me what I needed. I will definitely purchase from them again.

0 of 0 found this helpful

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Neto

Mexico

Overall
Durability
Value
Features
Design
Usability

excellent

October 8, 2013

This amp will blow your woofers, perfect match with infinity´s kappa perfect 6.1. Great view

0 of 0 found this helpful

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Ig

Houston, TX

Overall
Durability
Value
Features
Design
Usability

Infinity KAPPA FOUR

September 20, 2013

Excellent amp, a little tempermental with mounting and power source. Car alternator supplied too many volts and would kick offline. Rerouted power to remote battery cured problem.

0 of 0 found this helpful

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Mr C

Canada

Overall
Durability
Value
Features
Design
Usability

Great Amp

September 17, 2013

The amp is great. It has fantastic sound, lots of power, and is easy to install and set up. The frequency response is good and it is easy to make adjustments. I am very happy with this amp.

0 of 0 found this helpful

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Daviboysmith

Canada

Overall
Durability
Value
Features
Design
Usability

Great amp

August 21, 2013

The sounds is clear and crisp, love this amp. Much better than the MTX 4004 that I originally had. Does not cut out and runs quite cool.

0 of 0 found this helpful

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Sikotik13

Maynard, IA

Overall
Durability
Value
Features
Design
Usability

Absolutely Gorgeous

July 9, 2013

After having an unnamed Maxxsonics made 4-channel heat itself to death on me, I opted to bite the bullet and mate this to my Kappa Perfect 6 and Reference 6830cs speakers. One word: Amazing.for an amp that is literally, half of the size of the amp it replaced, it pushes twice as much power and is still cool to the touch. Sound quality was the primary purpose of my build, and it more than meets my needs. Also, it looks beautiful.

0 of 0 found this helpful

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Brandon

Fort Lauderdale

Overall
Durability
Value
Features
Design
Usability

Dissapointed

December 31, 2012

I spent a while looking for a good 4 channel amp to buy and I saw that this amp received good feed back. After having it in for almost a month, it blew on me. Now before you say I had my wiring bad, no, I had a solid ground with full contact, proper sized power and ground. I've had problems with the amp to what I was suggested it to be as clipping. I had the voltage input at about half and the vibrating from the speakers stopped and to add to that, the fuses didn't blow, the amp did, non of the protections worked. Maybe I just received a bad amp, but I surely won't be buying anything from Infinity again.

0 of 0 found this helpful

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Ross J.

Canada

Overall
Durability
Value
Features
Design
Usability

Awesome Piece

November 23, 2012

Powering 2 - 10" Kappa 100.9W's in bridged mode in an extended cab GMC pickup, tri-amped with active crossover. The sound is crisp, clear and as loud as you want it to be, but be prepared to upgrade your charging system - this amp will give your alternator a workout. A joy to setup, all settings are easy to configure and no tweaking was necessary after initial setup. The sound is fantastic, with no coloration audible. Highly recommend this amp to anyone looking for a clear natural sound. Sonic Electonix was great to deal with and any future purchases will definitely be through them.

0 of 0 found this helpful

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carlos310

channelview tx

Overall
Durability
Value
Features
Design
Usability

Strong,Reliable, crisp sounding amp

October 14, 2012

I have been pushing this amp for more than a year straight without any problems. sounds amazing!

0 of 0 found this helpful

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Ben

Atlanta, GA

Overall
Durability
Value
Features
Design
Usability

Good amp

September 2, 2012

This amp was good working, but it messed up so SE hooked me up with a better amp! I would still recommend this amp.

0 of 0 found this helpful

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Justin

Clarence, NY

Overall
Durability
Value
Features
Design
Usability

Kappa Four

July 26, 2012

Had a powerbass amp before this one and the Kappa Four is definitely worth the extra $$. 2x cleaner and has extreme power for the compact design. Definitely enjoy the controls on the faceplate considering it is mounted on the back wall of my f150.

0 of 0 found this helpful

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Jose

Channelview, TX

Overall
Durability
Value
Features
Design
Usability

Kappa Four

December 2, 2011

Amazing power on a compact design. Sound quality is outstanding!

0 of 0 found this helpful

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DrBen

Tuscaloosa, AL

Overall
Durability
Value
Features
Design
Usability

Kappa Four

September 2, 2011

Absolutely everything I wanted in an amp, plus a power rating that is very conservative. It is small, powerful, clean as crystal, has the right adjustments, and is very robust. You can use the front two channels to push all the speakers you want, and bridge the back two for a really conservative 300x1 @ 4ohm. I swear this back two channels bridged has driven my 2 4ohm jls (2ohm load) as well as my Kappa monoblock (rated 500rms at 4ohm). When set up in the livingroom against other considerations for my mids and highs, going from my other amps to the Infinity showed just full and musical the Infinity amp is compared to some lesser brands. Best I have owned, and it is not the most expensive I have owned.

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damien

nashville, TN

Overall
Durability
Value
Features
Design
Usability

A1 Everything

May 3, 2011

Sonic Electronix is awesome and this amp kicks *** I own 2 and my mids and highs rock

0 of 0 found this helpful

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Jason

Everett, WA

Overall
Durability
Value
Features
Design
Usability

Great amp for a Great price.

February 16, 2011

I use this to power my Infinity Kappa series 6.5's & 6X9's. And it does an incredible job of it. Small size, big power, sleek design, Infinity is the only way to go for your mids and highs.

0 of 0 found this helpful

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Apolloshep

Charlotte, NC

Overall
Durability
Value
Features
Design
Usability

Could not ask for more........Well woth the money.....

June 18, 2010

I bought this amp around 2 months ago from Sonic for $309.00 and it got quite hot but never shut off. I will say that I had it lying on the carpet in my trunk and carpet does not dissipate heat at all. The bottom of the amp is heavy thick metal more so than any amp I have seen. So the bottom acts as a heat sink as well it seems. I wound up mounting it (vertical) with 1.5 inch stand-offs from the carpet on my sub box and installed a squirrel cage fan (65CFM) from Sonic and she now runs warm to the touch. I did not rate this amp until I felt comfortable with the fact that it can measure up and not shut down when pushed. I have had a few other amps in this vehicle and they would shut down. My system consist of 2 10” Polk Momo subs powered by a MTX JH600 amp. I installed Infinity Kappa 6.5 components in the front doors and Infinity Kappa 6X9 coaxial in the rear. My head unit is a Pioneer DVD 3200. I also installed a 1 fared cap as well. All power and ground leads are four gauge. The total watts are just shy or 1300rms. I recently went on a 7 hour trip and ran the volume at moderate to high levels and I must say that this amp kicks butt! I cannot say how happy I am with it. I like my music loud and clear and this amp does both effortlessly. I cannot even turn it up too much because I am afraid that it will damage my ears! The highs are unbelievable as well as the midrange and bass. I have to set the EQ highs on the head unit to neutral. I will say as another reviewer stated that you better outfit this amp with high quality speakers otherwise you are wasting your money. You should always put more money in speakers than the amp anyway this is my belief. The setup instructions are clear and to the point. It is also nice having the controls on top of the amp. It has a small footprint, but is quite heavy considering this fact. When and if this amp dies, there is only one other brand that I would consider and that is Rockford Fosgate or another Infinity amp. I hope she goes the distance because I love it! I promise that if you buy this amp you will not be disappointed!

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Dave

Fruitdale, AL

Overall
Durability
Value
Features
Design
Usability

Cleanest sound possible

March 9, 2010

I upgraded to this Amplifier from Harman CA470 and I must say that the difference in sound quality is huge.. Highs/Mids/Lows all were perfectly blended into the air and smooth as silk. It has got better ref. SNR and is able to deliver more power consistently without overheating. I usually push my Amplifiers to their limits causing them to shutdown for protection sometimes, however I've not been able to shutdown this Amplifier even after my wildest efforts, thanks to Class D circuitry. Looks wise I would say, I found it average as per my taste, but who cares when Amplifier has to sit in the boot and just has to sound good, that is its primary job. The separate Bass booster lets you tune it to get more bass out of the system. But just as an advice, make sure that the connected speakers are of very good quality, as average quality speakers/components will be of no use with this state of the art Masterpiece.. I'm lovin it and I don't think I will ever be able to replace it as an upgrade..

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Anthony

Grand Rapids, MI

Overall
Durability
Value
Features
Design
Usability

Infinity KAPPA FOUR

July 6, 2009

Smallest amp ive ever owned. I have to put all my amps in a tight space n this amp is ideal for the operation. It has good thermal control and thats good cuz i use every ounce of power this thing has n its in an unvented space. Good quality. I like the way the tuning options r set up. Very user friendly.

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PC

Osterville MA

Overall
Durability
Value
Features
Design
Usability

The Best!

October 1, 2012

I have always been an Infinity fan and these Kappas coupled with the Kappa 4 amp absolutely rock! They are so clear and clean that you hear things in the songs that you may have never heard before. They can handle more volume than your ears can. The highs are ear shattering and the mids are tight. Just add a sub and you will be all set!

0 of 1 found this helpful

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Accessory Tools and Products

Accessories added

NVX XKIT44 4-Gauge 4-Channel Wiring Kit

4-Channel 100% OFC Complete True 4 Gauge Amp Kit with RCA Cables and Speaker Wire

Your Price $99.99

T-Spec V8-4DAK 4-Channel 4-Gauge Wiring Kit

Get everything you need to hook up your new amplifier!

Your Price $89.95

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

Comes with everything you need to upgrade your power and ground wire.

Your Price $79.99

Kicker Big 3 Package 1/0 Gauge Big 3 Upgrade Kit

Get all you need including wire cutters to upgrade your power and ground wire.

Your Price $149.99

Belva BBG3KT CCA 1/0 Gauge Big Three Kit

Features everything needed to upgrade factory power and ground wire.

Your Price $39.99

Universal Remote Level Bass Control

Controls bass level and frequency via RCA/Interconnect connectors on any amp.

Your Price $7.99

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

StreetWires FB4

4 AWG / 4 Gauge Firewall Bushing

Your Price $6.95

NVX XDBU4 - Top of the Line!

Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

NVX XIV45 4-Channel RCA Audio Interconnect Cable

5 Meters (16.4 ft.) 4-Channel RCA Audio Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $23.99

StreetWires ZN9 Series Interconnect Cable

16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!

Your Price $99.95

Kicker 4-Channel RCA Audio Interconnect Cable

4 Meters (13 ft.) 4-Channel K-Series RCA Audio Interconnect Cable

Your Price $19.95

NVX XWS1225 12 AWG Speaker Wire

25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $39.99

NVX XWS1250 Speaker Wire

50 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $29.99

NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

Your Price $13.99

Belva BBSW127 12 AWG Speaker Wire

12 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $14.99

Belva BBSW167 16 AWG Speaker Wire

16 Gauge 7 Meter (23 Ft) Speaker Wire (CCA)

Your Price $12.99

SMD DD-1 Distortion Detector

Set the gain of an audio amplifier quickly and accurately

Your Price $149.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

AutoSound 2000 CD-102

High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.

Your Price $11.99

Browse 1 question and 1 answer
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Why did you choose this?
Sonic Electronix Store
should be good clean power for my four 6.5 eminence
adam m on Aug 15, 2014

Product Summary

Manufacturer

Model Number

KAPPA-FOUR

UPC

050667035037

Weight

8.00lbs

Internal SKU

kappafour

Internal Product ID

17780

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: Infinity KAPPA FOUR