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Boss NX2800.1

2800W Max Onyx Series Monoblock MOSFET Power Amplifier


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  • Onyx Series Monoblock Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 1500 watts x 1 chan.
  • Max Power Rating:
    • 2 ohms: 2800 watts x 1 chan.
  • MOSFET PWM Power supply
  • Remote subwoofer level control
  • LED power and protection indicators
  • Variable 0 to +18dB Bass boost
  • Thermal and speaker short protection
  • Soft turn-on circuit
  • Variable gain controls
  • Line and speaker level inputs
  • Input sensitivity selector
  • Heavy duty aluminum alloy heatsink
  • Chrome RCA level inputs
  • Chrome screw terminals
  • Variable low-pass filter
  • Dimensions: 15-1/8"L x 10"W x 2-3/16"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
  • 1-year Manufacturer's warranty

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.
1500 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.
2800 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.
Onyx (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.

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.

2800 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.

1 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.
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.
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.
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.
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)
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.
105 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.
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).
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.

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

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
4 Star
3 Star
2 Star
1 Star

Average Attribution Rating


apache junction, AZ

Boss is the Bomb

May 11, 2014

This amp kicks much ass.I have it wired to 1 12" Pioneer In a 1.74' box ported and it pushes this 12 bigtime! Great Amp. and for the price, you really cant beat it.

11 of 15 found this helpful

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Cottage Grove, MN

Very Nice power, quality, and options for price

September 12, 2013

No RMS rating is available by maybe it's around 800-1000W RMS at 2 Ohm and maybe 600-700W at 4 Ohms with 14V. Runs fairly cool at 4 ohm but can be a bit hot at 2 ohms if you really max it. Definitely nice amp for the RMS power you get. Would I buy it again? It depends... If running at 8 or 4 Ohms, Yes. If running at 2 Ohms, definitely yes if I'm trying to power a 600W RMS subs. For 800W, maybe get the NX4500.

11 of 18 found this helpful

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Dysart, Iowa

I Love This Amp!!!

December 25, 2010

I love this amp. It pushes enough power to make my Two Twelves Polk Audio DXi's and my two Apline Type E's also twelves they pound the snow right off of my trunk. Only bad thing is you can only run 4 Gauge wire nothing more, i like the differnt options it allows alot of different fine tuning. I would recomend this for 3-4 Differnt subs or 1-2 High powered subs. Great amp!

9 of 15 found this helpful

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columbus, OH


November 22, 2013

Got three 2500 Watt boss twelves hooked up and now u can hear when im coming blocks away

5 of 9 found this helpful

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Tucson, AZ

This beast pushes!

February 26, 2011

Hooked up to two Lanzar MAXP154D's running 1000 watts to each @ 4ohms and they POUND! I have all the settings on this amp turned down and they still bang like no tomorrow. This amp is a powerhouse, no complaints!

7 of 13 found this helpful

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Ft. Washington, MD

Great amp.

March 21, 2014

I bought this amp for my little brothers car. I bought it to push one of my old mtx 10 inch sub that I gave em. Wow. I think this amp is underrated. It pushed the sub hard. My brothers car is sound proofed very well and it still rolled the mirror down when it was barely turned up. I would recommend this amp to everyone. Especially if your trying to save money and get a great product. Thanks sonic. Ps my brother love the remote sub control.

5 of 10 found this helpful

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westminster, MD

not bad at all

May 9, 2012

I got this to power 3 12" audiobahns, hits hard, doesn't overheat, could definitely use a cap though.

8 of 16 found this helpful

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nice overall

September 18, 2014

Has nice power...delivers deep bass....great design and very durable. lookin to get the 4500...this amp is good for just about any subs

3 of 7 found this helpful

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Port saint lucie, FL


August 31, 2014

It is a good amp to use, im using a 3000 watt max 10" pionner and its hard.

4 of 9 found this helpful

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Fort Wayne, IN

Alright amp

September 9, 2012

Alright for about 600 watts at most, no where near 1500, mine overheats alot, dont care for that much, bought it once, wouldnt buy it again, id rather just get an hifonics or something

7 of 15 found this helpful

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Bad egg, big bangs

October 30, 2012

First one I got died after a couple of weeks, but it was just a bad egg. Got a replacement and it hasn't let me down yet! This thing got so much juice to give out, and the little details such as the wiring setup makes this so easy to deal with. From now on, it's Boss half the way and Pioneer the rest.

6 of 16 found this helpful

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Pensacola, FL

Good amp

July 26, 2011

This amp outperforms most I've owned in the past. It's underrated.

5 of 15 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 FB8

8 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

NVX XIV25 V-Series 2-Channel RCA Cable

16.4 ft of V-Series 2-Channel RCA Audio Premium Interconnect Cable with Dual Twisted Pair Hyper-Flex Technology

Your Price $11.99

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 $9.99

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

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Sonic Electronix Store
Price and reviews
Shawn T on Nov 17, 2014

Product Summary


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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 NX2800.1