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MB Quart ONX4.80/500

980W RMS ONYX Series 5-Channel Amplifier (ONX-4.80/500)

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Success is a Measurement of Quality and Power

The success of any car audio amplifier depends on system quality and construction, ease of installation and configuration, and sound enhancing features. MB Quart engineers built the all new Onyx series amplifiers from the ground up to be an affordable amplifier with the audiophile and performance enthusiast in mind. This series is composed of value-packed class A/B amplifiers that boast affordability without sacrifice to power or quality. All Onyx Amplifiers come clothed in a beautiful new age piano black finish which accents interiors and brings a whole new level of sophistication to swallow. To match, the line of Onyx Speakers shows off the same piano black finish applied to their polypropylene cone woofers. It’s a perfect match every time.

Speaking of features, Onyx amplifiers bring the full tuning spectrum to your fingertips with variable high-pass, low-pass and subsonic filters built-in. To increase endurance, MB Quart designed Onyx amplifiers with military grade printed circuit boards and built-in system diagnostics that keep these amps running strong. High speed MOSFET output devices are used in the power supply to give you the best watts-per-dollar ratio. It’s not hard to see how success has been written all over these amplifiers, though with a piano finish that looks that good, we know you will be staring.

  • ONYX Series 5-Channel Class A/B Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 60 watts x 4 chan. + 250 watts x 1 chan.
    • 2 ohms: 120 watts x 4 chan. + 375 watts x 1 chan.
    • 1 ohm: 500 watts x 1 chan. (5th Channel Only)
    • Bridged, 4 ohms: 240 watts x 2 chan. (Channels 1-4)
  • CEA-2006 compliant amplifier
  • MOSFET PWM power supply
  • Wired remote bass level control included
  • LED power indicators shows when turned on
  • LED Protection indicators show high voltage, low voltage, short circuit, hard clip, over heating, or DC fault condition
  • Adjustable Bass EQ (0-10 dB bass boost at 45 Hz)
  • 4-way protection (DC, short, thermal, and overload)
  • 3 sets of RCA inputs
  • 5 channel operation
  • Heavy duty aluminum alloy heatsink for extreme heat dissipation
  • Silver-plated RCA level inputs
  • Silver-plated screw terminals
  • Variable high-pass filter (10-15,000 Hz)
  • Variable low-pass filter (30-150 Hz)
  • Frequency response: 10-25,000 Hz
  • Damping Factor: >180
  • Signal-to-noise: >92dB
  • THD: 0.05%
  • Channel separation: >80dB
  • Variable input level control: 0.2V-6V
  • Fuse size: External 120 amp
  • Dimensions: 22"L x 9"W x 2-1/2"H
  • 2-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.

60 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.

120 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.

240 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.
250 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.
375 watts x 1 channels
RMS Power @ 1 ohm
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 1 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

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.
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 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.

980 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.
2 AWG
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
1 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.
0.05%
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.
1 pair
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.

10 - 15,000 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.

30 - 150 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.
>92 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.
>80 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 - 10 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.
120A x 1 
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.

Yes
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.

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
57%
4 Star
29%
3 Star
0%
2 Star
14%
1 Star
0%

Average Attribution Rating

Durability
4.7
Value
4.7
Features
4.9
Design
4.6
Usability
4.7
Brett

Australia

Overall
Durability
Value
Features
Design
Usability
Great amp

April 4, 2011

This was my first 5 channel amp and I was pleasantly surprised at how well it did the job. It looks fantastic and delivered all the power I required to the rest of the system flawlessly. Tuning was simple and the standard operating temp was unbelievably chilled, it was below every other amp I've owned before.

2 of 2 found this helpful

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Steve

Tulsa, Ok

Overall
Durability
Value
Features
Design
Usability
Overall Good 5 Channel

March 27, 2011

Currently have this installed with 2 pairs of MB Quart 6 x8 components and 2 Boston Acoustic 10.5lf Pro subs. The front and rear channels have a lot of power and overall the amp has a lot of features.

However, the 5th channel lacks a bit, however acceptable for my listening levels. I have the 2 Ohm 10.5s in parallel so I'm presenting the amp with 1 Ohm. That was one of the reasons I bought this amp as it was 1 Ohm stable. The 10.5s just require a lot of power to get them to stand out, previously I had them paired with 1000watts at 1 Ohm and that was a good match.

I would have to say though now that I'm older, this is a perfect one amp solution for someone looking to have a single amp driving everything. Has a load of crossover and tuning options, the bass control works great as well. Just don't expect it to drive monster sub woofer loads. Would I buy again for a standard car audio system with great sound quality, yes! Would I buy it for a competition system or at least one over the top, no.

2 of 2 found this helpful

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Allen

Oakland, ca

Overall
Durability
Value
Features
Design
Usability
Cheap

January 15, 2013

Cheap product with cheap quality. Clarity is not very good. The good thing is that it never shut off.

0 of 0 found this helpful

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Kalob

Driftwood, TX

Overall
Durability
Value
Features
Design
Usability
Powerful

September 26, 2012

This was my first five channel amp. Before, i had un-amped pioneer door speakers and 2 L5 15's hooked to a brutus 2400w. When i put the onyx amp in, my door speakers were noticeably way louder/clearer, and the fifth channel is said to put out 500 watts max on this onyx amp, but pushed the hell out of my 15's. Sounds louder and better than the 2400 watt amp. The MB Quart is a great amp, with no extra batteries or big 3 upgrade, my lights still don't dim from this amp turned 3/4 of the way up.

0 of 0 found this helpful

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Alvin

New Orleans, Louisiana

Overall
Durability
Value
Features
Design
Usability
Great amp!!!

August 4, 2012

I'm a former Pro installer..now its just a hobby! I installed this amp into a relatives old school Monte Carlo a few months ago! This amp really impressed me with its clarity and output! I installed it on two Polk 5x7s, a set of Polk MoMo 6.5 components and tweeters...with the fifth channel powering a JL 10in. sub! This amp really puts out some very loud and crystal clear highs and Mids! I will also tell you, I didn't think that little ten would be heard in that big trunk...I WAS WRONG!!! This amp is really pushing that sub! You can really feel the bass!

0 of 0 found this helpful

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David

Pullman, Wa

Overall
Durability
Value
Features
Design
Usability
Good 5 Channel Amp

November 16, 2011

I was looking for a good SQ type amp for my pickup (limited space) and found this was 1 ohm stable on the sub channel for future upgrading.

The filters make it easy to keep bass out of the speakers that can't handle it without use of the head unit filters. Sub is crisp and clean but not insane. For the price I was very surprised how clean an amp this is, just don't expect to win any SPL awards. Perfect for listening to your music instead of using it as a back massager :)

The only weird thing is that there is no external fuse on the amp, and they suggest a 120 between the battery and the amp. I've run a 60 amp since ownership and haven't blown it yet. I suspect you would need a lot of load to warrant a 120 amp breaker/fuse.

I would buy again for this application, but would always run different amps for sub and components given the space and budget.

0 of 0 found this helpful

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Brian

CA

Overall
Durability
Value
Features
Design
Usability
Great amp overall

June 13, 2011

Bought this around 6 months ago for my whole system, running a Fi Audio 10" sub and 4 5.25" JL Audio door speakers. This thing sounds really clean and doesnt seem to draw too much power. The door speakers sound so much better than when using the deck, you almost dont need a sub.

i have my sub running at 4 ohms, so i could be getting more power out of the amp, but it still slams really hard. I also noticed that i dont have engine noise anymore, probably because of less draw on the alternator.

Build quality is pretty good overall, my only annoyance is that the tuning knobs are kind of set-in to the amp frame so you need a screwdriver to get to them. Just makes it harder to tune it tight spaces.


overall i am really satisfied with this amp, would buy again.

0 of 0 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 $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 $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

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4 AWG / 4 Gauge Firewall Bushing

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1/0 Gauge Firewall Bushing

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Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs

Your Price $17.99

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

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NVX XWS1250 Speaker Wire

50 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

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NVX XWS1625 16 AWG Speaker Wire

25 ft. of True 16 Gauge 100% Copper EnvyFlex Speaker Cable/Wire

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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

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Handheld boomSTICK measures your SPL range from 60 to 135 dB

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Product Summary

Manufacturer

Model Number

ONX4.80/500

UPC

806576217015

Weight

19.00lbs

Internal SKU

onx480500

Internal Product ID

23876

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: MB Quart ONX4.80/500