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MB Quart ONX4.80

4-Channel ONYX Series Car Amplifier (ONX-4.80)

Discontinued
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We apologize

This item has been discontinued

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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 4-Channel Class A/B Car Amplifier
  • RMS Power Rating:
    • 4 ohms: 80 watts x 4 chan.
    • 2 ohms: 160 watts x 4 chan.
    • Bridged, 4 ohms: 320 watts x 2 chan.
  • CEA-2006 compliant amplifier
  • PWM (Pulse Width Modulated) MOSFET power supply
  • LED power (green) and protect (red) indicators
  • Variable Bass Boost (0 to +12 dB bass boost at 45 Hz
  • 4/3/2 channel operation
  • Unbalanced RCA input jack
  • Preamp RCA outputs to daisy chain multiple amps
  • 4-Way System Protection circuitry (DC, thermal, overload, and speaker short protection)
  • Piano black gloss finish with illuminated logo
  • Heavy duty aluminum alloy convection heatsink for superb heat dissipation
  • Silver-plated RCA level inputs
  • Silver-plated screw terminals
  • Input sensitivity:
    • Low level: 200mV-6V
  • Variable high-pass filter (60-13,000 Hz, 24 dB/octave)
  • Variable low-pass filter (30-250 Hz, 24 dB/octave)
  • Damping factor: >180
  • Frequency response: 10-45,000 Hz
  • Dimensions: 14-7/8"L x 9"W x 2-1/2"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 - 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.

80 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.

160 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.

320 watts x 2 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.
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.
4
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.

640 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.
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)
Full (AP)
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.

60 - 13,000 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 - 250 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 - 12 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.
No
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.
25A x 2 
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.
Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.

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
11%
3 Star
7%
2 Star
4%
1 Star
4%

Average Attribution Rating

Durability
4.4
Value
4.8
Features
4.5
Design
4.5
Usability
4.6
Jimmy

Morriston, FL

Overall
Durability
Value
Features
Design
Usability
Great Value.

December 2, 2013

Amp puts out good power for price. I like the MB Quart amps for highs but the mono MB amps don't put out close to rated rms power.

9 of 16 found this helpful

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Lars

Groton, NY

Overall
Durability
Value
Features
Design
Usability
Awesome Amp At An Awesome Price

March 18, 2013

I love this amp, I have to say this amp came pretty highly recommended to me for my price range and I am glad I got it. The sound quality and power of this amp is great, makes my cheap walmart speakers sound good, which I had no idea they could.

Looks great, easy to use, sounds great, cheap, doesn't get much better than that!

9 of 16 found this helpful

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zica

Argentina

Overall
Durability
Value
Features
Design
Usability
fuse mb quart onx 4.80

December 31, 2012

the official website of mb quart says that this amp has two 30 amp fuses and two 25 amp specifications as stated on this page are wrong

8 of 14 found this helpful

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PSH

Southwest FL

Overall
Durability
Value
Features
Design
Usability
Great amp and great value

February 29, 2012

I recently was introduced to car audio and it has quickly grown into a hobby as mine. I started by purchasing a pair of Kicker DS68 for my rear deck and bought a JVC head unit as well. I quickly realized deck power was not ample for speakers so I started looking into amps. A friend of mine works at B**t Buy and is heavy into the car audio scene. He recommended MB Quart for amps. I looked into them and was taken aback by how cheap they sell. I can't possibly get a quality product for this price, can I? Well, I was way wrong. This thing POUNDS. I still have stock speakers on the front and will be very surprised if the sound quality doesn't jump up by 1/2 when I have them installed. I have no sound issues and it is quite easy on the eyes too. The glossy black on matte on gloss is very nice too and the light adds a dash of "bad*ss" to the amp. It doesn't overheat and it sits under my seat. You would have to pay quite a bit more to get anything near this quality. I only put 4 stars for ease of use because I am still learning how the toggles work, it is not a knock on the product.

8 of 14 found this helpful

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Christian

Overland Park, KS

Overall
Durability
Value
Features
Design
Usability
Amazing Amp.

February 7, 2013

bought to keep up with my 2 15' obsidian audio subs on 2200 watts. i have them on 2 crescendo 6.5 mid range and 2 cadence tweets. if you set your gains and x overs correctly, this amp sounds amazing. would buy again in a heartbeat. and DOES NOT GET HOT IF YOU SET GAINS RIGHT. people just crank the gain all the way most of the time and you cannot do that. youre creating excess power and distortion causing excessive heat. buy this beatiful amp guys

7 of 13 found this helpful

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Big tank

Temple, Ga

Overall
Durability
Value
Features
Design
Usability
Great amp

December 26, 2012

Excellent amp at a great price. I am running two sets of components with it.

8 of 15 found this helpful

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John

Houston, TX

Overall
Durability
Value
Features
Design
Usability
so so amp

August 5, 2012

Purchased this amp awhile back, so far it sounds great at lower volumes but when cranked there's some apparent distortion. I also tried wiring it bridged to my 2 front speakers and still, the amp distorts some even with more power.

This amp has also gone thermal on me and cut off several times in both 4 channel and 2 channel bridged operation after about 25 minutes at about 2/3 to 3/4 volume. This amp gets hot, sometimes too hot to touch and i've had to mount a computer fan to tame it a bit.. And even still, it's cut off with the computer fan.. Only real advantage i gained from the fan was that the cutoff time went from 5-6 minutes to about 1-2 minutes.

I'd say this amp is good for just average systems, gets pretty loud but not that loud. Keeping gains and volume down is a must. Overall, i wouldn't buy again. I think i'm shooting for a class d next time, like a polk audio pa d4000.4, kenwood xr-4s or infinity kappa four.

5 of 9 found this helpful

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Rashid

Kansas CityRaytown, MO

Overall
Durability
Value
Features
Design
Usability
real good amp

August 1, 2012

Man this amp is hard. It makes all my speakers like im at a concert or something. I would reccomend this to anybody that wants quality sound for a good price.

8 of 15 found this helpful

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M

bradenton, FL

Overall
Durability
Value
Features
Design
Usability
Sounds great if you can find one that works...

March 1, 2013

Ordered this amp to complement my onx1500.1d, channels 3 and 4 were defective. Sonic sent it to MB Quart and delivered me a new one, unfortunately it was also defective. Maybe I just had bad luck... these amps DO sound good for the money, maybe run a little hot (a/b class), I am just tired of swapping out brand new amps...

Again, if you can find one that works, good deal for the money.

6 of 12 found this helpful

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Adam

Thomasville, Ga

Overall
Durability
Value
Features
Design
Usability
High pass crossover

June 3, 2012

I have a 125.4 and a 80.4, both onyx series mb quart amps. The high pass crossover on these really does NOT go to 13000 hz. It is actually closer to 1300 hz. I found this out when trying to set the high pass filter to 4000 hz using the SMD CC-1. I tried a lower tone (1000 Hz) and was able to calibrate it, but the adjustment was almost all the way up. About a 16th of a turn from the highest setting or "13000 Hz". Other than this the amp pushes pretty good power and works fine for running full range speakers.

3 of 6 found this helpful

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redeyz V.F.A.C.

Woodbridge Va

Overall
Durability
Value
Features
Design
Usability
Good amp for the buck.

August 4, 2011

Great and louder with an EQ hooked up to it. You'd pretty much get a great, clear sound with a Alpine high-end head unit. They complement each other like night and day.

4 of 8 found this helpful

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Nicholas

Medford, NY

Overall
Durability
Value
Features
Design
Usability
Love It!!!!

June 29, 2011

I absolutely love this thing it was perfect for what I needed pumps out a lot of clean power its a little big for my small car but i knew that when i ordered it

6 of 12 found this helpful

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kj

omaha

Overall
Durability
Value
Features
Design
Usability
great 4 channel

February 14, 2013

I use this to power four infinity 3 way speakers and it works great. I am happy with this amp.

5 of 11 found this helpful

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Cody

Dalton, Ga

Overall
Durability
Value
Features
Design
Usability
GREAT Amp

December 30, 2012

Upgraded from infinity reference components & 6x9's powered by a Sony XM-GTX6040 (60 watts to 4 channels) To this bad boy powering Focal's Access series components & 6x9's in my '06 Tiburon and its a MAJOR improvement. I thought my first setup sounded great but this beyond expectations for the money. Cant say much about the crossover settings though, ive got them wide open controlling the frequencies played with my EQ up front under my deck.

5 of 11 found this helpful

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Danny

Colorado

Overall
Durability
Value
Features
Design
Usability
MB Quart ONX 4.80

July 11, 2012

I have two of these pushing 3 sets of Polk Audio MM6501's.....these amps are great with awesome sound quality.....lots of power!! I give 5 stars cause the price is great, the look and design is sharp out of the box.....I have had them over a year the rest is user friendly.

6 of 13 found this helpful

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Larry VFAC Washington

NO. Va

Overall
Durability
Value
Features
Design
Usability
Owned up to its reputation

March 12, 2012

For many years in the game (1996) This brand like the Percision Power amps have been the Apex to car-audio geeks who have used these lines in exotic cars! Well lets just say they have not changed their quality of performance but went to plastic. Not bad but it heated up, what will happen? A MELTDOWN! I will say this is a great amp for the buck and you can take it to its max potential! It does what it says!!! Just dont use cheap speakers like Kenwood it will distort to oblivion!!!

3 of 7 found this helpful

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mickey

reno, NV

Overall
Durability
Value
Features
Design
Usability
this is a great buy

February 28, 2012

Put it in 1994 4 runner 2 4" dcm 2 ways and 2 dcm 6x9s sound great no problems no over heating and we have it under the seat.

4 of 9 found this helpful

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charles

rochester, NY

Overall
Durability
Value
Features
Design
Usability
power and beauty

December 17, 2011

This amp is strong durable and beautiful. From its black piano finish to its powerful clean bass it puts out you will be happy. I loved it. I owned it for a year and was never dissapointed or let down. It never got hot clipped or shut off.

5 of 11 found this helpful

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Micky

NYC

Overall
Durability
Value
Features
Design
Usability
musical majic

November 17, 2011

I have owned the others and like the maxxsonics amps because they have the most flexible and easiest controls. I dont know why they even bother with a Hifonics line when this MBquart line is the best and actually I think it sounds better than any amp out there which makes this amp an absolute gem and steal for the price. I also had both the Hifonics Zeusi80 and the Autorek1400.
The Zeus was a nice amp, with sweet highs, and the Autotek was very nice amp also, with rich mids, BUT THIS mbquart just sounds so open and clear and musical that I would say borderline magical.
The only oher explanation for such unbelievable sound is my new head unit I put at same time, a Pioneer HD unit.

I seriously doubt you can get a better sounding amp for at least double the price. I also had a Polk660, and none compares to this amp. It just sounds so open, big, and clear at low and loud levels. If I had to sum it up in a main characteristic, it would be "transparently immersive" as you seem to be in the music, not just listening. I have to credit some of this to the head unit as well. I used to think I had overly bright and lean speakers untill I upgraded and now they sound totaly transparent :)

6 of 13 found this helpful

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baceman

pulaski, VA

Overall
Durability
Value
Features
Design
Usability
Great Amp!

September 22, 2011

I studied on this amp for a long time before I ordered it. I read the different reviews comparing MB Quart to Old School Phoenix Gold and US Amps. I was like...I don't know. I went to the MB Quart web site and all of their amps ARE CEA 2006 compliant and I likeed the looks of the ONYX sreiers the best and decided to give it a shot. Let me just say that if you are worried about buying this amp...don't be! I have it in my van 160x2 (2-ohm stereo) on my highs and 320x1 (4-ohm bridged) to a pair of 12" subs and I am glad I went with these amps. They sound amazing!!! Both quality and strength. I would say that this amp would compare to a pair of Phoenix Gold M-50s...for those of you who know old school and are looking for an amp to make your system scream loud and clear like it used to - this is the one!

7 of 15 found this helpful

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matt

florida

Overall
Durability
Value
Features
Design
Usability
great value

August 17, 2010

This amp has a lot of features allowing for a lot of adjustment in my system. the amp puts out a lot, very clear sound and well priced. Good amp for the mids and highs. at least to start out with.

3 of 7 found this helpful

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JR

Van Nuys, CA

Overall
Durability
Value
Features
Design
Usability
Great amp

June 26, 2014

This amp has a great sound at a good price....

6 of 14 found this helpful

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Aaron A.

Chandler, Arizona

Overall
Durability
Value
Features
Design
Usability
Great amp for the money!

November 20, 2012

I hooked this amp up to a pair of Kenwood Components and this amp really makes them scream. It has great power output. It does get hot because of the A/B class but if you have a cooling fan on it you will be fine. Lots of settings make for good sound. Not too big, it will fit under most seats. Great design and easy to use. One of the best bang for the buck on this site!

5 of 12 found this helpful

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bigsweat

ney york

Overall
Durability
Value
Features
Design
Usability
great buy

October 16, 2012

had this amp a while running all my door speakers.This is a great amp and a great price.set the gains corrett and it shines.A++++

9 of 20 found this helpful

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mickey

reno, NV

Overall
Durability
Value
Features
Design
Usability
this is a great buy

February 28, 2012

Put it in 1994 4 runner 2 4" dcm 2 ways and 2 dcm 6x9 sounds great no problems no over heating and we have it under the seat.

2 of 6 found this helpful

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doug h.

albany,ny

Overall
Durability
Value
Features
Design
Usability
best sound for the buck

March 15, 2011

I've been into Mb quart since '95,I've heard them at their best...and their worst. I purchased the onyx 4ch x 80w to replace a blown interior amp.i was kinda hesitant to get the (maxxsonics) mbquart amp,at first.but I went with the name brand I have grown to love,and trust. And I was blown away by the sound quality(crystal clear,uncolored highs, solid mid range,and bass reproduction) and the depth of the soundstage that was produced by this amp.paired with Mb quart speakers- you will be astounded by the low price but quality sound.hands down the most flexible, best 4ch amp I have owned to date. To sum it up-don't want to kill your pockets,but you demand great sound quality...THIS AMP IS BUILT FOR PEOPLE WHO LOVE GREAT SOUND....and I'm glad maxxsonics kept true to the name brand and the quality,associated with Mb quart

5 of 12 found this helpful

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Eric

Ochlocknee, GA

Overall
Durability
Value
Features
Design
Usability
MB QUART LIES

June 1, 2012

This amp lies about the HPC range! The amp says 60-13kHZ when actually it only goes to about 1100HZ! This is verifiedy the SMD CC-1! This greatly upsets me because i was suppose to use this and run my superpowers but realizing this is going to set my build back.. Will certainly be boycotting MB Quart. I do own a MB QUART ONX 4.125 as well and checked it to double check my discover and it also did this. So.. no more MB QUART for me.

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Vaughn

Canada

Overall
Durability
Value
Features
Design
Usability
Good

March 4, 2013

Paired it with the onyx 1000.1d Great amps, don't heat up.

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Product Summary

Manufacturer

Model Number

ONX4.80

UPC

806576217008

Weight

12.00lbs

Internal SKU

onx480

Internal Product ID

24110

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