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MB Quart OA500.1

500W Max Class Q1 1-Channel Monoblock Onyx Series Amplifier


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This item has been discontinued

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General Features:

  • Onyx Series 1-Channel Monoblock Class Q1 Car Amplifier
  • Max Power Rating:
    • 4 ohms: 250 watts x 1 chan.
    • 2 ohms: 500 watts x 1 chan.
  • FLUID-FETS MOSFET Circuit maximizing power efficiency while improving sound quality
  • 1 Ohm stable
  • LED power (green) and protect (red) indicators
  • Variable BassEQ Boost (0 to +12 dB bass boost fixed at 45 Hz)
  • Built-in system diagnostics
  • Mono channel operation
  • Preamp RCA outputs to daisy chain multiple amps
  • 3-way protection circuitry (thermal, overload, and speaker short protection)
  • Heavy duty Black Onyx aluminum alloy heat-sink with illuminated MB Quart design
  • Input sensitivity:
    • Level: 200mV-6V
  • Variable low-pass filter (40-300 Hz)
  • Variable sub-sonic filter (10-40 Hz)
  • 4 gauge power and ground wiring is required for installation. Contact us for information regarding a discount on select amplifier kits from our website when purchased together with this amplifier.
  • Dimensions: 9-7/16"W x 11-13/16"D x 2-1/4"H
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

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 (MB Quart)
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.

500 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
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.
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)
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.

40 - 300 Hz
Subsonic Filter
Allows you to block (filter) ultra-low frequencies that your subs cannot reproduce.
10 - 40 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
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.
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).
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.

Some amplifiers can be "strapped" together in order to increase the output of a single audio channel. These amplifiers feature RCA preamp outputs, allowing you to pass the signal directly from one amp to the other to ensure consistency.

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


Sarasota, FL

Good Amp, Great Price!

June 11, 2014

I am always impressed with MB Quart Amps. I own 4 of them now and 2 of them are this amp. They get a bit hot but definitely do the job.

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Total Steal!

April 24, 2014

I purchased this amp after getting two different cerwin vega amps that were junk. Overall extremely happy with this product and the price I got ($100). That's why I think it's a total steal- previously I had a 250 watt Memphis pushin two skar 8s and now that I hooked this MB I have double the bass and it hits clean and hard notes. Everyone compliments the crispness of the bass and it is just loud pushin those 8s now. Definitely recommend! Easy to hook up and lights up cool. My only concern is it does get warm the few times I've checked it so I'm gonna keep an eye on that. Just a heads up. Totally willing to buy more MB Quart products.

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Great product for the price

April 19, 2014

I was looking for a good amp without blowing the budget. I paired this with a Kicker CompRT in my F-150 and it works fantastic.

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valparaiso, IN


December 21, 2013

one of the best amplifiers I've ever bought. I would definitely recommend this to anyone who wants to add bass to their system. You definitely cannot go wrong with this amplifier.

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Flagstaff, AZ

Nice Amp

November 23, 2013

I am running this amp to a single 10" Kenwood sub in a ported box, and it pushes it great. Amazing amp for the money!

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bakersfield, CA


October 2, 2013

For the price you can't beat it,have this on a dual 4ohm sub wire to 2 ohms and doesn't even get warm.

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San Diego, CA

Excellent amp to put under the passenger seat!!

September 17, 2013

I used this amp paired with a JBL GTO804 8"sub in a custom enclosure and also for a 10" w3 in a stealthbox it works great with no issues for either one. The bass knob is perfect to change bass for different songs on the fly.

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Frankston, TX


April 26, 2013

I have this amp hooked up too a Polk MM-15 in a air tight sealed box in a reg cab pick-up so it's pushing the sub with over 120rms over the rated 380rms of the sub and when the sub is broken in more I would think it would handle a whole lot more from this amp. Further more I have bass at all levels of listening wither it's at low vol or when I just want to crank it up to hear it hit damn hard. The only thing that I can say is it's down side is it's foot print but hell small cab.

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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 $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

Small Universal Remote Level Bass Control

The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.

Your Price $11.99

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

Kicker KI24 K-Series RCA Audio Interconnect Cable

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

Your Price $16.95

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

Scosche SPL Meter SPL1000F

Handheld boomSTICK measures your SPL range from 60 to 135 dB

Your Price $21.99

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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: MB Quart OA500.1

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