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MB Quart ONX4.125

1000W RMS ONYX Series 4-Channel Amplifier (ONX-4.125)

  • 4.4

(26 reviews)

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The price was great and the speakers were flawless. Thank you!

- Steve from Chicago, IL

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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: 125 watts x 4 chan.
    • 2 ohms: 250 watts x 4 chan.
    • Bridged, 4 ohms: 500 watts x 2 chan.
  • CEA-2006 compliant amplifier
  • Peak Power Handling: 2000 Watts
  • 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: 20"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 125 watts x 4 channels
RMS Power @ 2 ohms 250 watts x 4 channels
Bridged RMS Power 500 watts x 2 channels
Peak Power Output 1000 watts x 2 channels
Amplifier Specifications
Amplifier Class AB
Number of Channels 4
Total Peak Power Output 2000 watts
Total RMS Power Output 1000 watts
Maximum Input Gauge Size 4 AWG
Minimum Impedance Unbridged 2 ohms
Minimum Impedance Bridged 4 ohms
THD at Rated RMS Power 0.05%
Speaker Level Inputs No
Preamp Outputs 1 pair
Built-in Crossover Low-pass (LP)
High-pass (HP)
Full (AP)
High-Pass Crossover Frequency 60 - 13,000 Hz
Low-Pass Crossover Frequency 30 - 250 Hz
Signal-to-Noise Ratio >92 dB
Channel Separation >80 dB
Bass Boost 0 - 12 dB
Bass/Gain Remote No
Fan Cooled No
Fuse Rating 40A x 3 
CEA-2006 Compliant Yes
Warranty and Return Policy
Return Policy Standard Return Policy
Parts Warranty Duration 1 year
Labor Warranty Duration 1 year
Warranty Provider Manufacturer
Customer Review Summary for MB Quart ONX4.125
Average Customer Rating is 4.4 out of 5 stars:
  • 4.4
based on 26 Reviews
Share your thoughts with others:
Rating Distribution:
5 star:
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.
73%
4 star:
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15%
3 star:
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0%
2 star:
.
.
4%
1 star:
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8%
what's this?
Average Attributes Rating:
Durability
  • 4.3
4.3
Value
  • 4.6
4.6
Features
  • 4.4
4.4
Design
  • 4.3
4.3
Usability
  • 4.7
4.7
what's this?
Quick Comparison:
Most Helpful Customer Reviews:
November 27, 2012 Great!!!!
Review by
Robert from Alton, TX
Overall
  • 5.0
Durability
  • 5.0
Value
  • 4.0
Features
  • 4.0
Design
  • 4.0
Usability
  • 5.0
I connected this amp, never imagined the power and the sound quality you don't even need to adjust amp level too high. I recommend this product you would not regret it having one.
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November 17, 2012 awesome amp!!
Review by
Marcel from Amarillo, TX
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
very sturdy amp it is very solid!! heavy and it is HUGE , hasnt got hot on me just warm but very nice
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November 14, 2012 very large but also very strong
Review by
eric from Lemont, IL
Overall
  • 5.0
Durability
  • 5.0
Value
  • 3.0
Features
  • 5.0
Design
  • 1.0
Usability
  • 5.0
theres nothing special about this amplifier except that its very strong. it is very large for the wattage.
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November 9, 2012 owner
Review by
Lkncomputer from Huntersville NC
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 5.0
Design
  • 5.0
Usability
  • 5.0
I have been running this amp for a good wile now and it has proven to be up to any task i ask of it, driving 2 ohms or 4 x 4 nothing stops this amp and it does it with style and awesome audio too, power is right on par with my meters right to the end of its range heat was their but cool down was fast, well done MB Quart!!!
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August 14, 2012 best dollar per watt that produces clean power
Review by
josh from olive branch MS
Overall
  • 5.0
Durability
  • 5.0
Value
  • 5.0
Features
  • 4.0
Design
  • 4.0
Usability
  • 5.0
I love this amp, the quality of the sound is great, it actually produces the power it claims, and doesn't run hot, I'd recommend it to anyone, pushes my crescendo pwxs excellently.

Only con is the amps size, it easily dwarfs my aq 2200
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View All 26 Reviews for MB Quart ONX4.125
Amplifier Wiring Kits
Get the wires you need to properly install and power your car amp.
  Product Price Add?
NVX XKIT44 NVX XKIT44
4-Channel 100% OFC Complete True 4 Gauge Amp Kit with RCA Cables and Speaker Wire
$114.99
Bass Remote Control
Control the volume level of your bass and amplifier from the front of the vehicle.
  Product Price Add?
Universal Remote Level Bass Control Universal Remote Level Bass Control
Controls bass level and frequency via RCA/Interconnect connectors on any amp.
$13.99
Small Universal Remote Level Bass Control Small Universal Remote Level Bass Control
The Scosche RLC is a smaller universal bass remote that connects via RCA inputs.
$14.99
Speaker Wire
Improve the sound quality by delivering more power when replacing your factory wiring. High quality speaker will maximize your amplifier investment and system performance.
  Product Price Add?
NVX XWS1225 Speaker Wire NVX XWS1225 Speaker Wire
25 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire
$39.99
NVX XWS1250 Speaker Wire NVX XWS1250 Speaker Wire
50 ft. of True 12 Gauge 100% Copper EnvyFlex Speaker Cable/Wire
$29.99
Kicker XW1220 Speaker Wire Kicker XW1220 Speaker Wire
12 Gauge Wire - 20 ft. of Dual Twist Speaker Cable with Sleeves for a Clean Install
$39.95
StreetWires SCP1215BL - 12 AWG Speaker Wire StreetWires SCP1215BL - 12 AWG Speaker Wire
12 Gauge Wire - 15 ft. of Speaker Cable with Twisted Construction
$24.99
RCA Interconnects
You will need a good set of RCA interconnect cables to connect your amplifier to your head unit. Using high quality cables ensure the best sound possible by reducing unwanted noise interference, providing tight contacts, and utilizing the latest in cable technology.
  Product Price Add?
NVX XIX45 X-Series RCA Interconnect Cable NVX XIX45 X-Series RCA Interconnect Cable
16.4 ft. of 4-Channel X-Series RCA Cable with Dual Twisted Pair Hyper-Flex Technology
$44.99
StreetWires ZN9 Series Interconnect Cable StreetWires ZN9 Series Interconnect Cable
16.4 ft. of 4-Channel RCA Cable with Rhodium-plated contacts and ZeroNoise construction for clear signal transfer!
$99.99
Installation, Tools & Accessories
With our professional install card, you can have your amp installed by a pro near you, or you can purchase tools and do the install yourself.
  Product Price Add?
StreetWires FB4 StreetWires FB4
4 AWG / 4 Gauge Firewall Bushing
$7.99
StreetWires FB0 StreetWires FB0
1/0 Gauge Firewall Bushing
$4.99
Kicker DB1448 (09DB1448) - Top of the Line! Kicker DB1448 (09DB1448) - Top of the Line!
Distribution Block with Two 1/0 or 4 AWG Inputs and Four 4 or 8 AWG Outputs
$29.95
Professional Installation for your Car Power Amplifier Professional Installation for your Car Power Amplifier
Covers labor charges through our professional installer network.
$89.99
Testing and Performance
Optimize your system's performance with testing tools such as SPL meters, bass test discs and more!
  Product Price Add?
Scosche SPL Meter SPL1000F Scosche SPL Meter SPL1000F
Handheld boomSTICK measures your SPL range from 60 to 135 dB
$24.99
AutoSound 2000 CD-104 AutoSound 2000 CD-104
The ultimate amplifier level setting disc used for evaluation of audio components
$12.99
AutoSound 2000 CD-102 AutoSound 2000 CD-102
High Frequency Test CD specifically designed for the set-up and evaluation of sound system imaging and placement.
$12.99
AutoSound 2000 CD-103 AutoSound 2000 CD-103
Audiophile reference series test disc for evaluation of all audio components.
$12.99

Product Summary

Manufacturer: MB Quart
Model number: ONX4.125
UPC: 806576217046
Weight: 16.00 lbs
Internal SKU: onx4125
Internal product ID: 27474