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Boss CXX2705

1200W RMS Class AB 5-Channel Chaos Exxtreme Series Amplifier

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General Features:

  • Chaos Extreme Series 5-Channel Class AB Car Amplifier
  • Channel 1-4 RMS Power Rating:
    • 4 ohms: 150 watts x 4 chan.
  • Subwoofer Channel RMS Power Rating:
    • 4 ohms: 600 watts x 1 chan.
  • Max power output: 2700 watts
  • Pulse Width Modulated MOSFET power supply
  • Wired remote bass level control included
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +18 dB bass boost at 50 Hz)
  • Soft turn-on circuit
  • 5/4/3/2 or Mono channel operation
  • Speaker-level (high-level) inputs with signal sensing for automatic turn-on
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Heavy duty aluminum alloy heat-sink
  • Fixed high-pass filter (80 Hz)
  • Variable low-pass filter (35-160 Hz)
  • 4 gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.
  • Dimensions: 11"W x 20-1/4"L x 2-7/8"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product History:

Boss CXX2705 thumbnail
(newest, current model)
Boss CX1800 thumbnail
(previous model, replaced by Boss CXX2705)

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.

150 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.

300 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

Power Specifications - Subwoofer Channel

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 speaker(s) or subwoofer(s) 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. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
600 watts x 1 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.
Chaos EXXtreme (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.
5
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.

2700 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.

1200 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.
Any Gauge with use of Spade Terminal 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.
Not Bridgeable
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)
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.

80 Hz Fixed
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.

35 - 160 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.
30A x 3 
Strappable
Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.
No
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
1 year
Labor Warranty Duration
1 year
Warranty Provider
Manufacturer

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
89%
4 Star
11%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.9
Value
5.0
Features
4.9
Design
4.8
Usability
4.9
Brian

Milwaukie, OR

Overall
Durability
Value
Features
Design
Usability
UnderRated for sure ..

September 9, 2013

I own both Boss CX1800 and the Boss CXX2705.
The CX1800 is in my 05 Aveo Hatch and the CXX2705 is in my 04 Durango. Both run Dual 12" Kicker CompD122 and the Aveo has PB 6 1/2 seperates and PB 4x7. The CXX2705 Durango has Kicker DS35 up front and Kicker CS674 in the doors and backhatch.
Both cars have dual batteries and a 2 farad cap. This amp does the trick. IMHO this Amps are very under rated. If you match your wattage with good quality speakers these amps seriously give much higher AMPS a run for there money. BE WARNED these amps do get hot. Install them in an open area. SO GRAB ONE.. YOU WON'T BE Disappointed

13 of 17 found this helpful

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Bobby

Canada

Overall
Durability
Value
Features
Design
Usability
Great Amp

January 31, 2015

This amp is perfect for my 300. I replaced 2 amps with 1, it has power to spare and adjustments galore. My 2 x 12" subs hit hard and the sound is crystal clear....and Loud!. Cant beat the price for a 5 channel amp with this much power.

6 of 11 found this helpful

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Twistad

Lengby

Overall
Durability
Value
Features
Design
Usability
Great value

September 20, 2014

Im loving this amp. Now I need a better box

9 of 17 found this helpful

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Tommy

Richmond, VA

Overall
Durability
Value
Features
Design
Usability
Nice Amp....

March 30, 2015

I purchase this 2700 watt Boss amp for my car, I wanted to separate the sound from all of my speakers. This amp did the trick. I can bring up the fronts while toning down the rear or vice versa depending what type of music I'm playing. I'd recommend this amp to others who have been looking at it, it works great and the price is reasonable also.

0 of 0 found this helpful

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Freddy Krueger

Demotte , IN .

Overall
Durability
Value
Features
Design
Usability
Fantastic 5 channel high out put amp for the money

March 18, 2015

The amp powers 4 NVX VSP65 speakers in both the front and rear of car and a Pioneer TS-W3003d4 subwoofer . The gains are set at about 45% and at half volume the car just bursts with clean clear crisp highs , perfect mids , and slamming lows with 0 harmonic distortion !! I highly recommend this amp if you want high power to run your whole system with one amp . I know Boss is not top of the line equipment but the high output and the rave reviews sold me . You won't be disappointed . The only downside is the amp is huge !!

2 of 4 found this helpful

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Jimmy

Lewiston Idaho

Overall
Durability
Value
Features
Design
Usability
great amp

May 29, 2014

I installed the amp in the trunk of my 1968 Chevelle Malibu it sounds fantastic

12 of 24 found this helpful

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Troy

Indianapolis, IN

Overall
Durability
Value
Features
Design
Usability
Great value

February 2, 2015

If you need a 5 channel amp for a good price this is the one. Looks good and gives my Kicker speakers the juice they need to sound awesome. Would definitely recommend this amp to anyone on any kind of budget.

7 of 15 found this helpful

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Daniel

St. Louis, Missouri

Overall
Durability
Value
Features
Design
Usability
Great 5-Channel Amp For The Price! Sounds Awesome!

February 1, 2015

I purchased this amp to replace my old two amps (one 4-channel and one mono channel), I had in the back of my 2007 Honda Civic. This 5-channel amp was exactly what I needed. It installed quickly, looks awesome, and sounds really wonderful across my 2 front component speakers, 2 rear coaxial speakers, and my single 10" subwoofer! Truly happy with purchasing this product for my car. I would recommend this product to anyone looking to switch from running two separate amps to power their system to only one.

6 of 13 found this helpful

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abedi

costa mesa ,ca

Overall
Durability
Value
Features
Design
Usability
Great product

July 6, 2014

Excellent amplifier with tons of power. Does not over heat. Have used it to power two 6 1/2 and two 6 x 9 inch Kicker's. Subwoofer is 12 inch 800 watt RMS Kicker at 2 ohms. No problems so far. Have used a 3 Farad capacitor to compensate for power fluctuation if any. I highly recommend this amplifier. Great price also and nice looking.

7 of 16 found this helpful

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Accessory Tools and Products

Accessories added

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 $151.99

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

Stinger SI4612 4000 Series Interconnect Cable

12 ft. 6-Channel 4000 Series Audio Interconnect Cable

Your Price $23.99

Stinger SI4617 4000 Series Interconnect Cable

17 ft. 6-Channel 4000 Series Audio Interconnect Cable

Your Price $41.99

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

Browse 4 questions and 15 answers
Hide answersShow all answers | Sort by
Why did you choose this?
Sonic Electronix Store
It was at the right price and wanted a 5 channel amp.
Tommy C on Feb 20, 2015
Good reviews for the price.
donald m on Dec 13, 2014
excellent multi channel amp for the price...plays loud and clean!
marc j on Feb 5, 2015
I recently purchased Kicker 40DCWS122
Ported enclosure with dual 12" CompS subwoofers to use with this amplifier.
Mitchell C on Sep 1, 2014
I don't see a Amp wiring kit for this Boss CXX2705 single amp with 5 channels listed..What kit do I need?..
mark P on Mar 5, 2015
Best Answer: Mark, Thanks for your question. This kit below should work perfect for you in regards to wiring up the Boss CXX2705 Amplifier. This kit has everything you need essentially: Power wire, ground wire, lots of speaker wire, main-line fuse, and 3-Sets of RCA's. You most importantly need to remember you'll need three sets of RCA's that will hook up from your head unit to the amplifier. Also, the 4-Gauge wire size that is included in this kit is preferred over using 8-Gauge in your car. This amplifier is amazing and I'm so glad I choose to buy this product for my car months ago. If you have any more questions, please ask. Good Luck! -Daniel H.
Belva BAK46
Belva BAK46
Reply (2) · Report · Daniel H on Mar 7, 2015
· Add Answer · I Have This Question Too (0)
Is the subwoofer channel capable of running at 2ohms as well? I only see a 4ohm rating.
Kevin H on Feb 16, 2015
Best Answer: Hi Kevin,

The manufacture does NOT provide a 2ohm ratings, so you/we are to assume that the amplifier is NOT capable of running at that impedance. In addition, doing so is considered "Not intended use" and deemed Warranty Void if attempted. Needless to say, Please do not attempt this.
Reply · Report · Customer SStaff on Feb 17, 2015
· Add Answer · I Have This Question Too (0)
what is the dimensions of this product?
Jeffrey B on Jan 29, 2015
Best Answer: Dimensions: 11"W x 20-1/4"L x 2-7/8"H
Reply · Report · Corey HStaff on Jan 29, 2015
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

CXX2705

UPC

791489119580

Weight

12.00lbs

Internal SKU

cxx2705

Internal Product ID

68540

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 CXX2705

  • Boss Chaos EXXtreme Amplifiers
  • How to Install a Car Amplifier