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Boss PH4.400

1600W Phantom Series 4-Channel MOSFET Power Amplifier

In Stock
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List price $299.99

$84.95

with warranty

You Save: $215.04 (71.68%)

Arrives by Tuesday, Sept. 23 to zip 07095

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Bundled Savings with this Product

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40% Off on 4-Channel RCA Cables w/ purchase!

Save 40% off the NVX XIV45 4-Channel RCA Audio Interconnect cables with your purchase! You will need RCA cables to install your amp!

9.60

21823

427

Boss PH4.400

$84.95

+

40% OFF

NVX XIV45

$23.99

Special Price $14.39 ($23.99 if purchased separately)

NVX XIV45

5m (16.40 ft) 4-Channel Twisted RCA • V-Series • Frost Blue Jacket • Dual Twisted Pair Hyper-Flex Technology For Better Signal Transfer

(Offer 1 of 1)

Combined Total Price

$99.34

You Save $9.60

  • Phantom Series 4-Channel Class A/B Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 160 watts x 4 chan.
  • Max Power Rating:
    • 2 ohms: 400 watts x 4 chan.
    • Bridged, 4 ohms: 800 watts x 2 chan.
  • Max power output: 1600 watts
  • Bridgeable outputs
  • MOSFET PWM Power supply
  • Wired remote bass level control included
  • LED power and protection indicators
  • Variable 0 +/- 18 dB Bass boost
  • Trimode operation to connect a pair of speakers plus a subwoofer on one pair of output channels
  • Thermal and speaker short protection
  • Heavy duty black anodized heatsink
  • Soft turn-on circuit
  • Remote turn-on/turn-off circuit
  • Gold-plated RCA High and low level inputs
  • Gold-plated screw terminals
  • Fixed high-pass crossover (50-150 Hz)
  • Variable low-pass crossover (45-90 Hz)
  • Frequency response: 9-50,000 Hz
  • Dimensions: 9-1/2" D x 13-7/16"W x 2-1/4"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.
  • 1-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.

160 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.

800 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.

400 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.
Phantom (Boss)
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.

1600 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.

640 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.
0.01%
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)
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 - 150 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.

45 - 90 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.
103 dB
Channel Separation
Also referred to as crosstalk. The amount of interference on one stereo channel caused by the leaking of the other stereo channel. The higher the rating in decibels (dB), the better the Channel Separation.
90 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.
Yes
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.
20A 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.

No

Warranty and Return Policy

Parts Warranty Duration
6 years
Labor Warranty Duration
6 years
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
83%
4 Star
0%
3 Star
0%
2 Star
0%
1 Star
17%

Average Attribution Rating

Durability
4.5
Value
4.7
Features
4.3
Design
4.6
Usability
4.8
killerhere

orange county

Overall
Durability
Value
Features
Design
Usability
great sound and value

August 24, 2014

this item works great i would buy another i would recommend anyone in the market for a budget amp this is the one to get.

0 of 0 found this helpful

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Fernando

Brazil

Overall
Durability
Value
Features
Design
Usability
FALSE power rating!!

September 18, 2013

This amplifier has nowhere near the rated power. We tested and it was capable of 55W per channel at 4 Ohms and 165W on the bridge at 4 Ohms.

0 of 0 found this helpful

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Kenneth

Westland, MI

Overall
Durability
Value
Features
Design
Usability
Product failed after 6 months

August 28, 2013

Product failed after 6 months. I would not buy this brand again.

0 of 0 found this helpful

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Jdpber

Seneca, SC

Overall
Durability
Value
Features
Design
Usability
Great amp for the money

July 22, 2013

I purchased 2 of these amps about 6 months ago. And installed them in my boat on the passenger dash side dry storage. Fed via 0/1 marine fiberglass wrapped fireproof wire getting power from two dedicated house group 29 batteries isolated from the start battery on a digital charge relay ballast system. Audio comes from a pioneer BEH-X8500HB with tripple 4v RCA outputs. The speakers are 2 pairs of Polk MM651UM performance marine speakers. And the 2nd amp feeds a 10" bazooka and a 12" 1200w in a sealed box. The cockpit hits 138dB and it is clean audio no clip to 40' out at 87dB. Every one that has seen or been in my boat over the summer so far says it is the cleanest sounding stereo that they have heard. The bass is a solid pound for an open air configuration and it sends trimmer ripples out from the sides of the boat. These amps are great value for the $$$ and deliver a great sound for the money. They are the perfect product for my application. I will be using them again in future applications. I am overly happy with these amps. They compare to amps I have had in the past that were 5x the cost.

0 of 0 found this helpful

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Christopher

Puerto Rico

Overall
Durability
Value
Features
Design
Usability
excellent service

July 12, 2013

The product arrived perfect at the date that they told me. price couldn't find better and has been over 6 months and still going hard every day.

0 of 0 found this helpful

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SD_A4

Carlsbad, CA

Overall
Durability
Value
Features
Design
Usability
Good value

June 5, 2013

Using this amp to power 2 Polk MM521's and a Sony 10" sub in a small truck cab. This amp has more than adequate power for the job! Sound is very clean and the install and setup was easy as pie. Highly recommend if you're on a budget.

0 of 0 found this helpful

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jj

austin,texas

Overall
Durability
Value
Features
Design
Usability
excellent

February 10, 2013

A lot of amp for the price, great buy, my first boss puchase, will be buying other products with their name

0 of 0 found this helpful

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Scott

Olanta, SC

Overall
Durability
Value
Features
Design
Usability
tons of power

September 5, 2012

Purchased the full phantom system (amp,5 1/4" and 6x9's) They handle full volume thrash metal easily and the music sounds fuller than it did through the infinity system they replaced. Take the time to adjust each channel, its worth it! And an install kit makes it simple to install.

0 of 0 found this helpful

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NEETZ

Mauritius

Overall
Durability
Value
Features
Design
Usability
WOW!

June 3, 2012

Got this amp for the last two months. Pushing 4 speakers 6x9 pionner 5 ways and a pair of pioneer ts-s20 tweeters. Still got power to give. I fully recommend this amp for speakers.

0 of 0 found this helpful

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lahf

bridgeport, NE

Overall
Durability
Value
Features
Design
Usability
awesome

May 10, 2012

This amp from Boss is kickin' my Kicker 15 solo l3 perfectly, and still has some leftover power for my little tweeters. I give this amp an awesome!

0 of 0 found this helpful

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JJ

Livermore, California

Overall
Durability
Value
Features
Design
Usability
Good stuff!

November 6, 2011

This amp is awesome! It goes well with the subs and what not! If you want a good amp get this one! I havent had any problems with it either and I've owned it for 6 months!

0 of 0 found this helpful

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Herb

Naptown, IN

Overall
Durability
Value
Features
Design
Usability
Good deal

April 5, 2011

This amp is powering four 6.5 and a pair of 6x9, good deal 1600 watts for $115 can't go wrong

0 of 0 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

NVX XBG3PK 1/0 Gauge OFC Big 3 Upgrade Kit

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

Your Price $59.99

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

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

NVX XIX45 X-Series RCA Interconnect Cable

16.4 ft. of 4-Channel X-Series RCA Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $34.99

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

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
best amplifier
brien b on Aug 4, 2014

Product Summary

Manufacturer

Model Number

PH4.400

UPC

791489112116

Weight

11.00lbs

Internal SKU

ph4400

Internal Product ID

21823

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: Boss PH4.400