Garage
Shop
Account Icon
Account
Box Icon
Track
order
Telephone Icon
Call
Help Icon
Help
Door with Arrow Icon
Sign In
  1. Home
  2. MA Audio Store
  3. Discontinued MA Audio Car Audio & Electronics
  4. Discontinued MA Audio Car Amplifiers
  5. Discontinued MA Audio Class-D Amplifiers

Discontinued MA Audio Class-D Amplifiers

Filters
MA Audio ✕
Clear Filters
Reset Done
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.
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.
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.

Condition

Shop the Category

filter-icon Filters & Sort
You are currently viewing discontinued products.

MA Audio HK4000D

4000W RMS Class X / D Competition Monoblock Amplifier

HK4000D big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio HK4000D

4000W RMS Class X / D Competition Monoblock Amplifier

4000W Digital Class X Competition Mono Block Amplifier • 3600W x 1 @ 2 Ohm at 14.4V • 4000W @ 2 Ohm at 17.0V • Temperature, Voltage & Output Level LCD Display • Fully Unregulated Power Supply • Full Mosfet Circuitry • Stainless Steel Finish Heat sink • Low Pass and Subsonic Filters • 0 - 18 dB Bass Boost

7

4000W Digital Class X Competition Mono Block Amplifier • 3600W x 1 @ 2 Ohm at 14.4V • 4000W @ 2 Ohm at 17.0V • Temperature, Voltage & Output Level LCD Display • Fully Unregulated Power Supply • Full Mosfet Circuitry • Stainless Steel Finish Heat sink • Low Pass and Subsonic Filters • 0 - 18 dB Bass Boost

MA Audio HK2000D

Class D / X Monoblock Amplifier

HK2000D big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio HK2000D

Class D / X Monoblock Amplifier

2000W Digital Class X Competition Mono Block Amplifier • 1000W x 1 @ 2 Ohm at 14.4V • 1500W @ 1 Ohm at 14.4V • 1500W x 1 @ 2 Ohm at 17.04V • 1800W @ 1 Ohm at 17.0V • Fully Unregulated Power Supply • Full Mosfet Circuitry • Stainless Steel Finish Heat sink • Low Pass and Subsonic Filters • 0 - 18 dB Bass Boost

12

2000W Digital Class X Competition Mono Block Amplifier • 1000W x 1 @ 2 Ohm at 14.4V • 1500W @ 1 Ohm at 14.4V • 1500W x 1 @ 2 Ohm at 17.04V • 1800W @ 1 Ohm at 17.0V • Fully Unregulated Power Supply • Full Mosfet Circuitry • Stainless Steel Finish Heat sink • Low Pass and Subsonic Filters • 0 - 18 dB Bass Boost

MA Audio HK1000D

Digital Class D Monoblock Amplifier

HK1000D big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio HK1000D

Digital Class D Monoblock Amplifier

1000W Class-X Monoblock Amplifier • 1000W RMS x 1 @ 1 Ohm • Stainless Steel Finsh Heatsink • Strappable with another HK-1000D • 1 Ohm Stable • Remote Gain Control Included • RCA Outputs

9

1000W Class-X Monoblock Amplifier • 1000W RMS x 1 @ 1 Ohm • Stainless Steel Finsh Heatsink • Strappable with another HK-1000D • 1 Ohm Stable • Remote Gain Control Included • RCA Outputs

MA Audio HK400D

HK400D big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio HK400D

Digital Mono Amplifier • 400W x 1 @ 2 Ohm RMS • 190W x 1 @ 4 Ohm RMS • 3-Way Protection Circuitry • Strappable with a 2nd Class D Amplifier • Variable Low Pass Filter • 0 - 18 dB Variable Bass Boost Control • Remote Knob

6

Digital Mono Amplifier • 400W x 1 @ 2 Ohm RMS • 190W x 1 @ 4 Ohm RMS • 3-Way Protection Circuitry • Strappable with a 2nd Class D Amplifier • Variable Low Pass Filter • 0 - 18 dB Variable Bass Boost Control • Remote Knob

MA Audio HK10KA

10,000W Max, Class X (D) Monoblock Amplifier

HK10KA big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio HK10KA

10,000W Max, Class X (D) Monoblock Amplifier

(Special Order Item -- No Cancellations/Refunds) • Extreme Competition Class X (D) Monoblock Car Amplifier • 2500W x 1 chan. @ 4 ohm (14.1V) • 3500W x 1 chan. @ 4 ohm (17.5V) • 10000W x 1 chan. @ 1 ohm Max (17.5V)

(Special Order Item -- No Cancellations/Refunds) • Extreme Competition Class X (D) Monoblock Car Amplifier • 2500W x 1 chan. @ 4 ohm (14.1V) • 3500W x 1 chan. @ 4 ohm (17.5V) • 10000W x 1 chan. @ 1 ohm Max (17.5V)

MA Audio Dual 12" QS Complete Bass Package w/ BONUS AMP KIT!

HK400D + MAK88 Amp Kit + (2) MA120QS + Dual 12" MDF Sealed Box

COMBO-HK400D-2-MA120QS-DUAL-BOX-AMP-KIT big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio Dual 12" QS Complete Bass Package w/ BONUS AMP KIT!

HK400D + MAK88 Amp Kit + (2) MA120QS + Dual 12" MDF Sealed Box

HK400D Amplifier + 2) MA120QS Subs + Dual 12" MDF Box + MAK88 Amp Kit • The amplifier will push 200 watts RMS to each subwoofer! Plenty of power to make your car THUMP!

138

HK400D Amplifier + 2) MA120QS Subs + Dual 12" MDF Box + MAK88 Amp Kit • The amplifier will push 200 watts RMS to each subwoofer! Plenty of power to make your car THUMP!

Amp + Subs + Box Combo: MA Audio HK400D + MA212B

Class D Amp + Box w/ 2 12" Subs

HK400D+MA212B big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

Amp + Subs + Box Combo: MA Audio HK400D + MA212B

Class D Amp + Box w/ 2 12" Subs

Digital Mono Amplifier • 360W x 1 @ 2 Ohm RMS • 190W x 1 @ 4 Ohm RMS • 3-Way Protection Circuitry • Strappable with a 2nd Class D Amplifier • Variable Low Pass Filter • 0 - 18 dB Variable Bass Boost Control • Remote Knob

Digital Mono Amplifier • 360W x 1 @ 2 Ohm RMS • 190W x 1 @ 4 Ohm RMS • 3-Way Protection Circuitry • Strappable with a 2nd Class D Amplifier • Variable Low Pass Filter • 0 - 18 dB Variable Bass Boost Control • Remote Knob

MA Audio Dual 10" QS Complete Bass Package

HK400D + 2) MA100QS + Dual 10" MDF Sealed Box

HK400D_MA100QS_MDFD10 big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio Dual 10" QS Complete Bass Package

HK400D + 2) MA100QS + Dual 10" MDF Sealed Box

HK400D Amplifier + 2) MA100QS Subs + Dual 10" MDF Box • The amplifier will push 200 watts RMS to each subwoofer! Plenty of power to make your car THUMP!

58

HK400D Amplifier + 2) MA100QS Subs + Dual 10" MDF Box • The amplifier will push 200 watts RMS to each subwoofer! Plenty of power to make your car THUMP!

MA Audio HK4000D Open Box Unit

4000W RMS Digital Class X / D Competition Monoblock Amplifier

HK4000D big DISCONTINUED
Go to item page Right Arrow Icon of Right Arrow

MA Audio HK4000D Open Box Unit

4000W RMS Digital Class X / D Competition Monoblock Amplifier

4000W Digital Class X Competition Mono Block Amplifier • 3600W x 1 @ 2 Ohm at 14.4V • 4000W @ 2 Ohm at 17.0V • Temperature, Voltage & Output Level LCD Display • Fully Unregulated Power Supply • Full Mosfet Circuitry • Stainless Steel Finish Heat sink • Low Pass and Subsonic Filters • 0 - 18 dB Bass Boost

4000W Digital Class X Competition Mono Block Amplifier • 3600W x 1 @ 2 Ohm at 14.4V • 4000W @ 2 Ohm at 17.0V • Temperature, Voltage & Output Level LCD Display • Fully Unregulated Power Supply • Full Mosfet Circuitry • Stainless Steel Finish Heat sink • Low Pass and Subsonic Filters • 0 - 18 dB Bass Boost

 
    Clear all
    why-shoping-with-sonic

    We love people and we're ready to help you! See what separates us from our competition.

    Take advantage of our VIP rewards like 10% back on your purchases, free 2-day shipping, extended warranties, and free returns! Gain access to all of these rewards without any membership fees.
    Get great discounted (and possibly FREE) installation accessories with most car stereo purchases. This includes dash kits, wiring harnesses and antenna adapters that you will need to properly install your new car stereo.
    We are an Authorized Dealer for all the brands we sell, including the most premium brands in car and marine audio such as Hertz, JL Audio, NVX, Rockford Fosgate, Kicker, Alpine, Kenwood and many more.
    Shop Deals and get up to 30% off premium brands! Shop Now! We are always looking out for the best products and deals to offer our customers. Don’t pay too much by shopping elsewhere!
    We have information on brands, gear, and more for you to explore! Check out our YouTube Channel for helpful how-to videos, product reviews, and Q&As. For a more detailed look, also visit our Learning Center!
    Our trained experts are here to assist you! They are just a phone call or click away to help you get the right gear for you and your vehicle!
    Why Shop With Us?
    Save up to 10 different vehicles in your garage
    Vehicle
    Store     Delete

    1988 Dodge Colt E

    2004 Jaguar S-Type

    1982 Dodge 400

    2003 Saab 9-3

    2009 Dodge Viper

    1995 Geo Tracker

    2014 Ford C-Max

    2000 Volkswagen Beetle

    1998 Mazda B2500

    2004 Dodge Durango

    Add vehicle Clear all vehicles
    Where to find vehicle info
    Are you sure you want to clear your garage?
    This action cannot be undone. Confirm

    Cancel

    This category was not designed for products.
    If you continue, you will be redirected to a category customized for your vehicle. Continue

    Cancel

    Shop your 1988 Colt E
    Why Use a Vehicle Fit Guide?
    Change vehicle | Shop without vehicle
    Whoa! Slow down. Add your details below!
    additional information required
    Add vehicle details to confirm fitment
    Ignore fitment details
    Find stereos and more that work -- fast.

    Additional information:

    Remove

    Can't find your vehicle? Click here and we'll help.

    Where to find vehicle info

    Go to Fitment

    Didn't find your car?

    Submit your details and we'll help!
    Please enter the letters as they are shown in the image above. Letters are not case-sensitive.
    Identify your vehicle and submodel details
    • Owner's manual
    • Vehicle's insurance card
    • Vehicle registration
    • Vehicle produced after 2005: Inside driver's side door
    • Vehicle produced before 2005: Rear passenger doorjamb, glove box, center console, or engine compartment
    Car Info Side Door Icon
    Vehicle Registration Icon
    Vehicle Insurance Icon
    Back

    Modern vehicles often require specific brackets, wiring harnesses, and mounting solutions. A fit guide ensures:

    • You see only parts engineered for your exact vehicle
    • You avoid incompatible radios, speakers, or wiring
    • Installation is smoother, faster, and frustration-free
    • You get the correct accessories the first time

    Whether you're replacing a factory stereo or upgrading your entire audio system, the Fit Finder eliminates uncertainty.

    Back
    Track your order
    Call our experts
    Support Center
    Return & Exchanges
    Follow on Instagram Instagram logo
    Subscribe on YouTube YouTube logo