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Boss NXD4500

4500W Max Onyx Series Class D Monoblock Power Amplifier

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List price $309.99

$129.99

with warranty

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Boss NXD4500

$129.99

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NVX XIN25

$8.99

Special Price $4.49 ($8.99 if purchased separately)

NVX XIN25

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  • Onyx Series Monoblock Class D Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 2100 watts x 1 chan.
  • Max Power Rating:
    • 2 ohms: 3500 watts x 1 chan.
    • 1 ohm: 4500 watts x 1 chan.
  • MOSFET PWM Power supply
  • Remote subwoofer level control
  • LED power and protection indicators
  • Variable 0 to +18dB Bass boost
  • Thermal, overload and speaker short protection
  • Soft turn-on circuit
  • Remote turn-on/turn-off circuit
  • Variable gain controls
  • Line and speaker level inputs
  • Input voltage sensitivity selector
  • 0/180-degree Phase shift selector
  • Heavy duty black anodized heatsink
  • Nickel-plated RCA level inputs
  • Nickel-plated terminals
  • Variable subsonic filter (15-45 Hz, 12 dB/octave)
  • Variable low-pass filter (45-90 Hz, 12 dB/octave)
  • Dimensions: 15-1/4"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.
2100 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.
4500 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.

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.
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.

4500 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.
4 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.
.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
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.

45 - 90 Hz
Subsonic Filter
Allows you to block (filter) ultra-low frequencies that your subs cannot reproduce.
15 - 45 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.
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.
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 4 
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

Specials with this Item

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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
75%
4 Star
13%
3 Star
13%
2 Star
0%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
4.8
Features
4.4
Design
4.3
Usability
4.6

sticcs1

riverside, ca

Overall
Durability
Value
Features
Design
Usability

Good Deal

June 30, 2012

At first after i heard that BOSS was a low end brand, i was a little skeptic when purchasing this amp. However, even though they are a little over rated, this amp is an excelent add on to my sound system. i have 3 rockford fosgate P3D412's hooked up to it at 2 ohms and they sound perfect. I was used to having a hifonics amplifier hooked up to 2 12" rockford fosgate HE subs, but this however is 100 times louder and rattles my frame. Boss may not be a top quality brand, but don't let peoples bad reviews fool you. When it comes to the ONYX series, you will be happy.

2 of 2 found this helpful

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keith

montgomery, AL

Overall
Durability
Value
Features
Design
Usability

good amp

May 13, 2014

Got this in a mustang convertible and it was hard to get bass sound with top down this help a lot.would recommend this amp.got two 10s and wow what a big difference.

0 of 0 found this helpful

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Pablo-Little Man

Fresno California

Overall
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Value
Features
Design
Usability

Audio Tech In Fresno Car Audio Installer

April 5, 2014

We sell these amps in our store that i work at and i have to say, im really surpised what power comes out of this amp, it may not be true power but to get the most of it does require a good cap or extra battery, 0gauge power wire with the big 3 aswell. 0 to 4 gauge splitter for the 4guage amp inputs. a good stereo like pioneer or a simple jvc headunit. and a fan to cool it down since it doesnt have a cooling system so to keep it from getting hot. and some good subs like kicker or re audio. it would sound awesome. from Fresno CA, this is my review and i reccomend it for this price.

0 of 0 found this helpful

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Lil Eddie

Auburn Alabama

Overall
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Value
Features
Design
Usability

Ejay Johnson

February 25, 2014

I recommend anybody to buy this amp. I wasn't a fan of Boss but I must say I love this amp. I have a Grand Marquis and this amp has those 2 Kicker Comp CVR's dancing all in the trunk

0 of 0 found this helpful

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james

woodland, CA

Overall
Durability
Value
Features
Design
Usability

Awesome amp for the price

February 3, 2014

You will not find a more powerful amp any where else for 120 bucks. This amp is perfect for anyone seeking power on a budget. And its strappable. What more could you want?

0 of 0 found this helpful

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johnc

Houston Texas

Overall
Durability
Value
Features
Design
Usability

great value

January 28, 2014

This product is very good and its durable and when I installed it I just fell in love with with it.

0 of 0 found this helpful

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Mike

Canada

Overall
Durability
Value
Features
Design
Usability

BOOOOOOOMING

October 18, 2013

Get things clear this amp is really amazing i never thought an amp could be too powerful but this one is! I got it wired to 2 12 inches boss p126dvc subwoofers and im getting a massage in the driver's seat. Im scared my back window will shatter. The car rattles like hell and I had to turn it down a little. My rear view mirror is unusable since it vibrates so much. It is cheap but it is powerful. Great buy good value fast delivery and so far no problems with it. I definitely recommend this product.

0 of 0 found this helpful

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Neil

Cicero, NY

Overall
Durability
Value
Features
Design
Usability

Excellent Bass

October 5, 2013

Using this amp to power my 1995 12" Volcano Cannibals (2) in a non ported enclosure. They POUND.

0 of 0 found this helpful

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Rene

Canada

Overall
Durability
Value
Features
Design
Usability

Working flawlessly

September 17, 2013

Simple setup. It works well and I would recommend it to anyone for a entry level amp.

0 of 0 found this helpful

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Young Polo

St Louis

Overall
Durability
Value
Features
Design
Usability

Well worth the low price.

July 25, 2013

This is everything you could expect and more. Theres nothing else to really say, its just great. Anybody saying its UNDERRATED obviously doesnt have their system wired up at 1-ohm. I have two 15s producing thunder off of this bad boy. Very sturdy and well made.

0 of 0 found this helpful

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sound-maker

killeen, texas

Overall
Durability
Value
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Usability

Boss NXD4500

November 30, 2012

This amp is amazing. Just make sure that when you ground it to your vehicle that the ground is solid. Have no other problems. Keeps the bass going and no shorting.

0 of 0 found this helpful

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ADrake

Wayland, MI

Overall
Durability
Value
Features
Design
Usability

Boss 4500w Amp

October 11, 2012

It was a little difficult to learn to use, being as I'm a novice. But it hit harder than any amp I've ever owned. The only real drawback I found was that after about a month, it stopped working. I don't know what's wrong with it, but if I can fix it, I'm putting it in my truck. I mean, who needs their hearing?

0 of 0 found this helpful

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Big Bone

1904, CA

Overall
Durability
Value
Features
Design
Usability

A little thump in your trunk

July 24, 2011

In the last few years I've owned about 4 different Boss amps and have NEVER had any problems with them Including this one. Whether or not Boss overrates their products remains to be seen. People who say they do, most likely have heard that from someone else who heard it from someone else who heard it from one of those people we like to call "know it all's". Not once have I read about someone actually putting it to the test themselves. Anyways, I bought this amp about a month ago and over all, I'm pretty happy with it. I currently have it pushing two 12" pioneer premier's (ts-w2000spl). I've had it running at 4 ohms and it was doing just fine and pushing my subs pretty hard; verified by multiple complaints from my wonderful neighbors. Yesterday, I wired my subs down to one ohm just because I wanted to see how much power I could squeeze out of this amp. I'm not sure yet if I'm going to leave it that way but we'll see. Needless to say, I almost blew my subs. It did get a little warm so I've decided to get a fan or two for it just to play it safe. All in all I WOULD definitely recommend this amp to anyone! The one and only complaint I have is that the level, the subsonic filter, bass boost etc.. are located at the bottom of the amp instead of on the sides, which in my case with the way I have it mounted, makes it hard to adjust any settings if need be. I did a lot of research and probably looked at just about every other high power amp out there for this price and I'm pretty confident that this amp is going to be the biggest bang you'll get for the money. If you're on a budget and are looking for something with a good balance between being cheap & reliable, go for it but by all means if you got the chetta get something betta!

0 of 0 found this helpful

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Bryan

Olympia, WA

Overall
Durability
Value
Features
Design
Usability

Alright but the usual issue.

July 17, 2011

This amp has a great price but I have noticed in the 6 months that I have had this as usual BOSS once again overrated this amp. 2100 RMS you say? It hits less hard than a 900 RMS kicker. It's decent but you can get better. Doesn't over heat and lasts. I wouldn't recomend it since it is overrated. Spend the bit extra and get a quality amp.

0 of 0 found this helpful

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Bryan

Olympia, WA

Overall
Durability
Value
Features
Design
Usability

Alright

March 24, 2011

I was hesitant to purchase this product due to the same reason as the prior review. Boss tends to overate their wattage and that's what they did. This is pushing out less than my friends 1500 Kicker amp. Looks decent and doesn't over heat often. Decent but not the best.

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Tyler

St. Marys, KS

Overall
Durability
Value
Features
Design
Usability

Great Product

November 2, 2010

I just recently bought this amp with low expectations since boss overrates their products' wattage... So far it has worked great with my boss P126DVC subs.. I wish i would have spent a little more money on my wiring kit.. only have a 5 gauge power wire... shoulda bought a 0 gauge.. Overall Great Product... So Far...

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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 $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 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

Professional Installation for your Car Power Amplifier

Covers labor charges through our professional installer network.

Your Price $89.99

Kicker KI24 K-Series RCA Audio Interconnect Cable

4 Meters (13 ft.) 2-Channel K-Series RCA Audio Interconnect Cable

Your Price $16.95

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 $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

AutoSound 2000 CD-104

Audiophile reference series test disc for evaluation of all audio components.

Your Price $11.99

Product Summary

Manufacturer

Model Number

NXD4500

UPC

791489113717

Weight

12.00lbs

Internal SKU

nxd4500

Internal Product ID

23377

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 NXD4500