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Boss CXXM1250

625W RMS Class AB Single Channel Monoblock Chaos Exxtreme Series Amplifier

In Stock. Only 2 Left!
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List price $269.99

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$64.95

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Bundled Savings with this Product

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25% off a 4 Gauge Amp Kit with Purchase

You will need an amp kit to install your amp, and the Belva BAK42 is the perfect kit for this amp. For a limited time, when you click "Add Both to Cart", you'll receive 25% off the amp kit with the purchase of select amplifiers.

6.25

68539

294

Boss CXXM1250

$64.95

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25% OFF

Belva BAK42BK (Black)

$24.99

Special Price $18.74 ($24.99 if purchased separately)

Belva BAK42BK (Black)

• Complete 4 Gauge 2-Channel Amplifier Installation Kit
• Designed Specifically For Car Audio Systems Up to 1000W RMS
• Premium Power and Ground Wire Provides Optimal Power Transfer

(Offer 1 of 1)

Combined Total Price

$83.69

You Save $6.25

General Features:

  • Chaos Extreme Series Monoblock Channel Class AB Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 500 watts x 1 chan.
    • 2 ohms: 625 watts x 1 chan.
  • Max power output: 1250 watts x 1 chan.
  • 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
  • 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
  • Variable low-pass filter (35-160 Hz)
  • 8 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 10-5/8"L x 2-7/8"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Product History:

Boss CXXM1250 thumbnail
(newest, current model)
Boss CX1100M thumbnail
(previous model, replaced by Boss CXXM1250)
Boss CH850M thumbnail
(previous model, replaced by Boss CX1100M)

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.
500 watts x 1 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 speaker(s) or subwoofer(s) 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. The 5th channel on these particular amplifiers are usually dedicated for driving subwoofers.
625 watts x 1 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. 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. This is the peak power output for the amplifier's 5th channel.
1250 watts x 1 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.
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.
1 - Mono
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.

1250 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.

625 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.
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.
No
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)
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
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 1 
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
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.

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
50%
4 Star
50%
3 Star
0%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.8
Value
5.0
Features
4.3
Design
4.8
Usability
5.0
ferrari22

Santa Ana Ca

Overall
Durability
Value
Features
Design
Usability
Great amp for the money

November 13, 2014

This amp is awesome by so far. I have it plugged into a Sony Xplod 10 inch sub and works great.

0 of 0 found this helpful

Help our customers find the most helpful reviews

bass head

Canada

Overall
Durability
Value
Features
Design
Usability
great value

October 12, 2014

I would recomend this product for the novice and for a wory free install. I currently have this installed with a low level pic up which works quite well and drives my sub hard. My only complaint is that the bass boost is only on or off, on +15 off zero... I would have liked it to have a dial instead... Other from that, it is a great solution for the hobbyists. not suitable for comp setups!

0 of 0 found this helpful

Help our customers find the most helpful reviews

truspector

Greenwood, SC

Overall
Durability
Value
Features
Design
Usability
Exceptional for the price

January 27, 2014

I knew what I was getting into with a forty dollar sub, but was pleasantly surprised that it outperformed my expectations. I built the box out of 5/8 MDF ported to spec as described in the owners manual. It doesn't hit like the JL13w3v3 I had previously but who would expect it to.

0 of 0 found this helpful

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Ryan

Newark, nj

Overall
Durability
Value
Features
Design
Usability
great for lower powered systems

January 7, 2014

I have it hooked up to a Lanzar Opti Scion 15 dvc and it knocks pretty good. The sub was in a ported box and it was too loud with the gain turned up 1\2 way. Put the sub in a sealed box and all of a sudden, I had great musical bass. But, distortion was way too much. Hooked up the bass remote and it was much better with less distortion. However, there was still to much distortion. I upgrade all of my power and speaker wires to ofc copper and the distortion is almost gone. The gain is up to 3\4 right now and it's hitting like a 15 should hit. I also added 12 oz of poly fill to the box and it helped more than I thought it would. Sonic is correct when they recommend the higher quality wires. The accessories make all of the difference. Great little amp and BOSS offers a great value compared to the other brands out there :)

0 of 0 found this helpful

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Accessory Tools and Products

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SMD DD-1 Distortion Detector

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Browse 1 question and 4 answers
Hide answersShow all answers | Sort by
can i power two pioneer w304r subs off of one of these, or would i have to buy two, and if i can power them off of one how do i wire them to make it work?
Gray S on Nov 18, 2014
Boss CXXM1250
Boss CXXM1250
Pioneer TS-W304R
Pioneer TS-W304R
Best Answer: Yes you can, I use the Boss CXXM1250 amp to power two pioneer w254r subs (same subs except 10") and my system sounds phenomenal. I've been told my system sounds better and hits harder than my buddies 1 15". You would have to wire the two subs together then wire the amp to one of the subs. You can find a wiring diagram online as well for this is the most common way to run two 4 ohm subs off a monoblock amp. This lowers the ohms (resistance) as well allowing you to get the max amount of power out of the amp.
Reply · Report · Devin D on Nov 19, 2014
· Add Answer · I Have This Question Too (0)

Product Summary

Manufacturer

Model Number

CXXM1250

UPC

791489119573

Weight

7.05lbs

Internal SKU

cxxm1250

Internal Product ID

68539

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 CXXM1250

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