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  3. Discontinued MB Quart Car Audio & Electronics
  4. Discontinued MB Quart Car Amplifiers
  5. Discontinued MB Quart 4-Channel Amplifiers

Discontinued MB Quart 4-Channel Amplifiers

Perfectly balanced sound awaits with MB Quart's versatile 4-Channel Amplifiers.

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Product Type
Price Range
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.
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.
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.
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.
Series
Many brands group their products into series or lines of products to help customers know the level of quality (good, better, best for example). You can filter by series and the brand using our guided browsing.
Minimum Impedance Unbridged
The lowest impedance the amplifier will handle when it is not bridged.
Minimum Impedance Bridged
The lowest impedance the amplifier will handle when it is bridged.
Remote bass/level controller
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.
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.
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.
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.

Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
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EXCLUSIVE

MB Quart ONX4.60 + Amplifier Kit Bundle

480W Max, 4-Channel ONYX Amplifier + Raptor 4 Gauge Amp Kit + Cache CTM Sound Dampening Material

ONX4.60_ISPKBL4BG big DISCONTINUED
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MB Quart ONX4.60 + Amplifier Kit Bundle

480W Max, 4-Channel ONYX Amplifier + Raptor 4 Gauge Amp Kit + Cache CTM Sound Dampening Material

ONYX Series 4-Channel Class A/B Car Amplifier • PWM MOSFET Power Supply • 4-way Protection Circuitry • Variable Low-Pass Filter • Variable High-Pass Filter • Amplifier Installation Kit with RCA Interconnect Cable • Designed for Systems Up to 1000W • Five 18" x 32" Pieces of Dead Shield Sound Dampening Material

ONYX Series 4-Channel Class A/B Car Amplifier • PWM MOSFET Power Supply • 4-way Protection Circuitry • Variable Low-Pass Filter • Variable High-Pass Filter • Amplifier Installation Kit with RCA Interconnect Cable • Designed for Systems Up to 1000W • Five 18" x 32" Pieces of Dead Shield Sound Dampening Material

MB Quart DSC 480 Open Box

(Open Box) 640W RMS, Class A/B 4-Channel Discus Series Amplifier (DSC480)

DSC-480 big DISCONTINUED
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MB Quart DSC 480 Open Box

(Open Box) 640W RMS, Class A/B 4-Channel Discus Series Amplifier (DSC480)

Discus Series 4-Channel Class AB Car Amplifier • 80W x 4 Chan. @ 4 Ohm • 160W x 4 Chan. @ 2 Ohm • 320W x 2 Chan. @ 4 Ohm • Preamp RCA Outputs • Switchable 2-Channel/4-Channel Input Modes

Discus Series 4-Channel Class AB Car Amplifier • 80W x 4 Chan. @ 4 Ohm • 160W x 4 Chan. @ 2 Ohm • 320W x 2 Chan. @ 4 Ohm • Preamp RCA Outputs • Switchable 2-Channel/4-Channel Input Modes

EXCLUSIVE

MB Quart Q4.150 + Amplifier Kit Bundle

1760W Max, 4-Channel Class A/B Q Series Amp + Kicker 4 Gauge Amp Kit + Cache CTM Sound Damp Material

Q4.150_09ZCK44 big DISCONTINUED
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MB Quart Q4.150 + Amplifier Kit Bundle

1760W Max, 4-Channel Class A/B Q Series Amp + Kicker 4 Gauge Amp Kit + Cache CTM Sound Damp Material

Q Series 4-Channel Class AB Car Amplifier • MOSFET Power Supply • 3-way Protection Circuitry • Variable Low-Pass Filter • Double Sided PCB Design • Amplifier Complete 4 Gauge Z-Series 4-Channel Amplifier Installation Kit• Designed for Systems Up to 1000W • Five 18" x 32" Pieces of Dead Shield Sound Dampening Material

29

Q Series 4-Channel Class AB Car Amplifier • MOSFET Power Supply • 3-way Protection Circuitry • Variable Low-Pass Filter • Double Sided PCB Design • Amplifier Complete 4 Gauge Z-Series 4-Channel Amplifier Installation Kit• Designed for Systems Up to 1000W • Five 18" x 32" Pieces of Dead Shield Sound Dampening Material

MB Quart ONX4.125 Open Box

Open Box: 1000W RMS, ONYX Series 4-Channel Amplifier (ONX-4.125)

ONX4.125 big DISCONTINUED
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MB Quart ONX4.125 Open Box

Open Box: 1000W RMS, ONYX Series 4-Channel Amplifier (ONX-4.125)

ONYX Series 4-Channel Class A/B Car Amplifier • 250W x 4 Chan @ 2 Ohm • 125W x 4 Chan @ 4 Ohm • Unbalanced RCA Input Jack • Preamp RCA Outputs • 4-Way System Protection Circuitry • Piano Black Gloss Finish

ONYX Series 4-Channel Class A/B Car Amplifier • 250W x 4 Chan @ 2 Ohm • 125W x 4 Chan @ 4 Ohm • Unbalanced RCA Input Jack • Preamp RCA Outputs • 4-Way System Protection Circuitry • Piano Black Gloss Finish

MB Quart RA640.4 (Factory Refurbished)

640W 4-Channel Reference Series Bridgeable Power Amplifier (RA6404)

RA640.4 big DISCONTINUED
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MB Quart RA640.4 (Factory Refurbished)

640W 4-Channel Reference Series Bridgeable Power Amplifier (RA6404)

• Item Condition: Factory Refurbished
• 80W x 4-Chan. @ 4 ohm
• 160W x 4-Chan. @ 2 ohm
• 320W x 2 Chan. @ 4 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

• Item Condition: Factory Refurbished
• 80W x 4-Chan. @ 4 ohm
• 160W x 4-Chan. @ 2 ohm
• 320W x 2 Chan. @ 4 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

MB Quart NAU 660 Open Box

540W Max, Nautic Series 6-Channel Marine Amplifier (NAU660)

No picture DISCONTINUED
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MB Quart NAU 660 Open Box

540W Max, Nautic Series 6-Channel Marine Amplifier (NAU660)

Nautic Series 6-Channel Class A/B Marine Amplifier • UV And Salt Water Resistant • 60W x 6 Chan. @ 4 Ohm • 90W x 6 Chan. @ 2 Ohm • Full Range Line Outputs • 4-Way System Protection • Gold-Plated RCA Level Inputs

Nautic Series 6-Channel Class A/B Marine Amplifier • UV And Salt Water Resistant • 60W x 6 Chan. @ 4 Ohm • 90W x 6 Chan. @ 2 Ohm • Full Range Line Outputs • 4-Way System Protection • Gold-Plated RCA Level Inputs

MB Quart NAU 460 Open Box

(Open Box) 360W Max, Nautic Series 4-Channel Marine Amplifier

NAU460 big DISCONTINUED
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MB Quart NAU 460 Open Box

(Open Box) 360W Max, Nautic Series 4-Channel Marine Amplifier

Nautic Series 4-Channel Class A/B Marine Amplifier • UV And Salt Water Resistant • 60W x 4 Chan. @ 4 Ohm • 90W x 4 Chan. @ 2 Ohm • Full Range Line Outputs • 4-Way System Protection • Gold-Plated RCA Level Inputs

Nautic Series 4-Channel Class A/B Marine Amplifier • UV And Salt Water Resistant • 60W x 4 Chan. @ 4 Ohm • 90W x 4 Chan. @ 2 Ohm • Full Range Line Outputs • 4-Way System Protection • Gold-Plated RCA Level Inputs

MB Quart OA800.4- OPEN BOX INCOMPLETE

800W 4-Channel Onyx Series Full Range Bridgeable Power Amplifier

OA800.4 big DISCONTINUED
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MB Quart OA800.4- OPEN BOX INCOMPLETE

800W 4-Channel Onyx Series Full Range Bridgeable Power Amplifier

• 100W x 4-Chan. @ 4 ohm
• 200W x 4-Chan. @ 2 ohm
• 400W x 2 Chan. @ 4 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

1

• 100W x 4-Chan. @ 4 ohm
• 200W x 4-Chan. @ 2 ohm
• 400W x 2 Chan. @ 4 ohm
• 3-Way System Protection
• 4/3/2/1 Channel Operation
• 4 Gauge Power and Ground Inputs
• FLUID-FETS Circuit for Smooth Sound Quality

MB Quart Q4.150 Open Box

(Open Box) 880W RMS Q-Series 4-Channel Amplifier (Q4150)

Q4.150 big DISCONTINUED
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MB Quart Q4.150 Open Box

(Open Box) 880W RMS Q-Series 4-Channel Amplifier (Q4150)

Q Series 4-Channel Amplifier • 150W x 4 Chan @ 4 Ohm • 220W x 4 Chan @ 2 Ohm • PWM MOSFET Power Supply • Full Feature Crossover Design • Clipping Control with LED Indicator • Frequency Multiplier • Multi-Channel Configuration • Built-In System Diagnostics

Q Series 4-Channel Amplifier • 150W x 4 Chan @ 4 Ohm • 220W x 4 Chan @ 2 Ohm • PWM MOSFET Power Supply • Full Feature Crossover Design • Clipping Control with LED Indicator • Frequency Multiplier • Multi-Channel Configuration • Built-In System Diagnostics

MB Quart OA800.4 + Complete 4 AWG Amp Kit

800W RMS 4-Channel Onyx Series Class SQ Full-Range Bridgeable Power Amplifier + Amp Kit

OA800.4_BAK44 big DISCONTINUED
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MB Quart OA800.4 + Complete 4 AWG Amp Kit

800W RMS 4-Channel Onyx Series Class SQ Full-Range Bridgeable Power Amplifier + Amp Kit

• 100 Watts RMS x 4 @ 4 ohm
• 200 Watts RMS x 4 @ 2 ohm
• 400 Watts RMS x 2 @ 4 ohm, Bridged
• Total Peak Power: 1600 Watts
• 2-Ohm Stable operation, bridgeable to 4-ohm
• Variable Bass Boost (Bass EQ, Ch 3 & 4 only): 0 - +9 dB at 45Hz
• 16 AWG speaker output connections
• Complete 4 Gauge 4-Channel Amplifier Installation Kit

• 100 Watts RMS x 4 @ 4 ohm
• 200 Watts RMS x 4 @ 2 ohm
• 400 Watts RMS x 2 @ 4 ohm, Bridged
• Total Peak Power: 1600 Watts
• 2-Ohm Stable operation, bridgeable to 4-ohm
• Variable Bass Boost (Bass EQ, Ch 3 & 4 only): 0 - +9 dB at 45Hz
• 16 AWG speaker output connections
• Complete 4 Gauge 4-Channel Amplifier Installation Kit

MB Quart DSC 4125 (DSC4125) Open Box with 1-year Warranty

1000W RMS, Class A/B 4-Channel Discus Series Amplifier (DSC4125)

DSC-4125 big DISCONTINUED
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MB Quart DSC 4125 (DSC4125) Open Box with 1-year Warranty

1000W RMS, Class A/B 4-Channel Discus Series Amplifier (DSC4125)

Discus Series 4-Channel Class AB Car Amplifier • 125W x 4 Chan. @ 4 Ohm • 250W x 4 Chan. @ 2 Ohm • 500W x 2 Chan. @ 4 Ohm • Preamp RCA Outputs • Switchable 2-Channel/4-Channel Input Modes

Discus Series 4-Channel Class AB Car Amplifier • 125W x 4 Chan. @ 4 Ohm • 250W x 4 Chan. @ 2 Ohm • 500W x 2 Chan. @ 4 Ohm • Preamp RCA Outputs • Switchable 2-Channel/4-Channel Input Modes

MB Quart MA1-440.4

440W 4-Channel Full Range M-Line Class D Compact Marine Ready Amplifier

MA1-440.4 big DISCONTINUED
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MB Quart MA1-440.4

440W 4-Channel Full Range M-Line Class D Compact Marine Ready Amplifier

• RMS: 75 W x 4 @ 4 ohm, 110 W x 4 @ 2 ohm, Bridged: 220 W x 2 @ 4 ohm
•Total RMS power output: 440 watts
• New Marinized Design for Marine Application
• Added conformal coating and stainless hardware

• RMS: 75 W x 4 @ 4 ohm, 110 W x 4 @ 2 ohm, Bridged: 220 W x 2 @ 4 ohm
•Total RMS power output: 440 watts
• New Marinized Design for Marine Application
• Added conformal coating and stainless hardware

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    MB Quart 4-Channel Amplifiers Information

    A 4 channel car amplifier from MB Quart will provide your vehicle with the power it requires. These amps can operate four channels and MB Quart is a leader in amplification solutions. Power your speakers with an MB Quart 4-channel amplifier for a great all-around sound.
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