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  1. Home
  2. Discontinued Car Audio & Electronics
  3. Discontinued Car Amplifiers
  4. Discontinued Class-D Amplifiers

Discontinued Class-D Amplifiers

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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 Key Features
Amplifiers can offer a diverse array of features. If you select more than one feature, then you will view amplifiers that have ALL features selected. These include speaker-level inputs that facilitate seamless integration with factory audio systems, Bluetooth connectivity suitable for ATV/UTV or Classic vehicle setups, built-in DSPs that provide enhanced control over your audio signal, and a host of other functionalities to explore.
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.
Brutus Series (60)
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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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JBL GTO-501EZ (Open Box)

Monoblock GTO Series Class D Car Amplifier

GTO-501EZ big DISCONTINUED
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JBL GTO-501EZ (Open Box)

Monoblock GTO Series Class D Car Amplifier

• RMS: 350W x 1 @ 4 ohm, 500W x 1 @ 2 ohm
• Total Peak Power: 770W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +12 dB
• Class D Circuitry
• Dimensions: 8-7/16"W x 9-11/16"L x 2-5/8"H

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• RMS: 350W x 1 @ 4 ohm, 500W x 1 @ 2 ohm
• Total Peak Power: 770W
• CEA-2006 Compliant
• Variable Bass Boost: 0 to +12 dB
• Class D Circuitry
• Dimensions: 8-7/16"W x 9-11/16"L x 2-5/8"H

Rockford Fosgate Punch P600.1bd R/B

(Factory Refurbished) 600 Watt Class-bd Monoblock Amplifier (2006-2007 Model)

P600.1bd big DISCONTINUED
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Rockford Fosgate Punch P600.1bd R/B

(Factory Refurbished) 600 Watt Class-bd Monoblock Amplifier (2006-2007 Model)

600W Class-bd Monoblock Amplifier • 325W x 1 chan. @ 4 Ohm • 600W x 1 chan. @ 2 Ohm • mass heatsink design • special design TO-247 MOSFETs • top mounted LED indicators • CEA-2006 compliant

600W Class-bd Monoblock Amplifier • 325W x 1 chan. @ 4 Ohm • 600W x 1 chan. @ 2 Ohm • mass heatsink design • special design TO-247 MOSFETs • top mounted LED indicators • CEA-2006 compliant

MTX Audio TA3401 Thunder 3401 R/B

Class D Monoblock Amplifier Thunder3401

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MTX Audio TA3401 Thunder 3401 R/B

Class D Monoblock Amplifier Thunder3401

400 watts RMS x 1 @ 2 • selectable low-pass crossovers • wired remote ThunderEQ bass boost • preamp outputs • speaker-level inputs with SmartEngage

400 watts RMS x 1 @ 2 • selectable low-pass crossovers • wired remote ThunderEQ bass boost • preamp outputs • speaker-level inputs with SmartEngage

Infinity Reference 1600a R/B

(Factory Refurbished) 894W Max, Reference Series Class D Monoblock Amplifier (REF1600A)

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Infinity Reference 1600a R/B

(Factory Refurbished) 894W Max, Reference Series Class D Monoblock Amplifier (REF1600A)

Reference Series Class D Monoblock Amplifier • 400W x 1 chan. @ 4 ohm • 600W x 1 chan. @ 2 ohm • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

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Reference Series Class D Monoblock Amplifier • 400W x 1 chan. @ 4 ohm • 600W x 1 chan. @ 2 ohm • MOSFET power supply • Gold-plated preamp RCA outputs • Wired remote bass level control included

JL Audio 600/1v3 , Open Box (Very Good, Used)

600W RMS Monoblock Slash v3 Series Class D Car Amplifier

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JL Audio 600/1v3 , Open Box (Very Good, Used)

600W RMS Monoblock Slash v3 Series Class D Car Amplifier

• Item Condition - Very Good, Used
• Peak: 600W x 1 @ 4 ohm, 600W x 1 @ 3 ohm, 600W x 1 @ 2, 600W x 1 @ 1.5 ohm
• Total RMS Power: 600W
• R.I.P.S. Power Supply
• Parametric Bass EQ
• Fully Variable Infrasonic Filter
• Dimensions: 13.40"L x 9.25"W x 2.36"H

• Item Condition - Very Good, Used
• Peak: 600W x 1 @ 4 ohm, 600W x 1 @ 3 ohm, 600W x 1 @ 2, 600W x 1 @ 1.5 ohm
• Total RMS Power: 600W
• R.I.P.S. Power Supply
• Parametric Bass EQ
• Fully Variable Infrasonic Filter
• Dimensions: 13.40"L x 9.25"W x 2.36"H

Lanzar OPTI4601D

4600W RMS, Monoblock Class D OptiDrive Series Car Amplifier

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Lanzar OPTI4601D

4600W RMS, Monoblock Class D OptiDrive Series Car Amplifier

• RMS: 1050W x 1 @ 4 ohm, 1980W x 1 @ 2 ohm, 3025W x 1 @ 1 ohm
• Total RMS Power: 4600W
• Class D Circuitry
• Bass Boost: 0-18 dB
• 0.5 Ohm Stable
• Dimensions: 21-3/4"L x 10-11/16"W x 2-1/8"H

• RMS: 1050W x 1 @ 4 ohm, 1980W x 1 @ 2 ohm, 3025W x 1 @ 1 ohm
• Total RMS Power: 4600W
• Class D Circuitry
• Bass Boost: 0-18 dB
• 0.5 Ohm Stable
• Dimensions: 21-3/4"L x 10-11/16"W x 2-1/8"H

Pioneer GM-D8500M Factory Refurbished

(Factory Refurbished) 1200W Max, GM Digital Series Class D Monoblock Amplifier

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Pioneer GM-D8500M Factory Refurbished

(Factory Refurbished) 1200W Max, GM Digital Series Class D Monoblock Amplifier

GM Series Monoblock Car Amplifier • Class D • 300W x 1 Chan. @ 4 Ohm • 600W x 1 Chan. @ 2 Ohm • 1200W Max • 0-12 dB Bass Boost • Chrome-Plated Terminals • Speaker-Level Inputs • Balanced Isolator Input Circuit

GM Series Monoblock Car Amplifier • Class D • 300W x 1 Chan. @ 4 Ohm • 600W x 1 Chan. @ 2 Ohm • 1200W Max • 0-12 dB Bass Boost • Chrome-Plated Terminals • Speaker-Level Inputs • Balanced Isolator Input Circuit

Power Acoustik PS1-2000D R/B

2000W Max, Class D Monoblock Amplifier

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Power Acoustik PS1-2000D R/B

2000W Max, Class D Monoblock Amplifier

Power Series Class D Monoblock Car Amplifier • 600W x 1 chan. @ 4 ohm • 900W x 1 chan. @ 2 ohm • 1200W x 1 chan. @ 1 ohm • Full regulated PWM MOSFET power supply • Preamp RCA outputs • 4-Way Protection circuitry

Power Series Class D Monoblock Car Amplifier • 600W x 1 chan. @ 4 ohm • 900W x 1 chan. @ 2 ohm • 1200W x 1 chan. @ 1 ohm • Full regulated PWM MOSFET power supply • Preamp RCA outputs • 4-Way Protection circuitry

Hifonics Brutus Elite BE1700.1D (Factory Refurbished)

1700W Monoblock Brutus Elite Series Super Class D Amplifier

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Hifonics Brutus Elite BE1700.1D (Factory Refurbished)

1700W Monoblock Brutus Elite Series Super Class D Amplifier

• Item Condition: Factory Refurbished
• RMS Power: 600W x 1 @ 4 ohm, 1200W x 1 @ 2 ohm, 1700W x 1 @ 1 ohm
• Total Peak Power: 3400W
• Variable Low Pass Filter
• Dimensions: 9.65" W x 15.35" L x 2.48" H

• Item Condition: Factory Refurbished
• RMS Power: 600W x 1 @ 4 ohm, 1200W x 1 @ 2 ohm, 1700W x 1 @ 1 ohm
• Total Peak Power: 3400W
• Variable Low Pass Filter
• Dimensions: 9.65" W x 15.35" L x 2.48" H

Hifonics BRZ1200.1D Refurbished

1200W RMS Brutus Series 1-Channel Monoblock Super Class D Amplifier (BRZ 1200.1D)

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Hifonics BRZ1200.1D Refurbished

1200W RMS Brutus Series 1-Channel Monoblock Super Class D Amplifier (BRZ 1200.1D)

• 1200W x 1-Chan. @ 1 Ohm
• 900W x 1-Chan. @ 2 Ohm
• 450W x 1-Chan. @ 4 Ohm
• Wired HFR-3 Remote
• 4-Way System Protection
• Phase Shift
• Silver-Plated RCA Inputs

• 1200W x 1-Chan. @ 1 Ohm
• 900W x 1-Chan. @ 2 Ohm
• 450W x 1-Chan. @ 4 Ohm
• Wired HFR-3 Remote
• 4-Way System Protection
• Phase Shift
• Silver-Plated RCA Inputs

JL Audio e1800DM (Marine Series e1800M) R/B

Class D Monoblock Amplifier -- Marine Version of e1800D

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JL Audio e1800DM (Marine Series e1800M) R/B

Class D Monoblock Amplifier -- Marine Version of e1800D

1000W RMS Class D Monoblock Amplifier • High-Damping Class D Circuit • Built-in Crossover: LPF 20 - 400Hz • 1000W x 1 @ 2 Ohm RMS (14.4V) • 640W x 1 @ 4 Ohm RMS (14.4V) • Pass-through RCA Outputs • High-level Inputs • CEA-2006 Compliant

1000W RMS Class D Monoblock Amplifier • High-Damping Class D Circuit • Built-in Crossover: LPF 20 - 400Hz • 1000W x 1 @ 2 Ohm RMS (14.4V) • 640W x 1 @ 4 Ohm RMS (14.4V) • Pass-through RCA Outputs • High-level Inputs • CEA-2006 Compliant

Kicker ZX2500.1 (08ZX2500.1)

2500W RMS, Class D Monoblock ZX Series Amplifier (ZX25001)

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Kicker ZX2500.1 (08ZX2500.1)

2500W RMS, Class D Monoblock ZX Series Amplifier (ZX25001)

ZX Series Class D Monoblock Car Amplifier • 1250W x 1 chan. @ 4 ohm • 2500W x 1 chan. @ 2 ohm • Balanced differential inputs make KICKER ZX Amplifiers compatible with any factory radios

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ZX Series Class D Monoblock Car Amplifier • 1250W x 1 chan. @ 4 ohm • 2500W x 1 chan. @ 2 ohm • Balanced differential inputs make KICKER ZX Amplifiers compatible with any factory radios

Kicker KXMA1200.1 / 44KXMA12001 (Open Box, Complete)

1200W RMS KXM Series Marine Class-D Monoblock 1 Ohm Stable Amplifier with Wireless Remote Level Control Knob Included

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Kicker KXMA1200.1 / 44KXMA12001 (Open Box, Complete)

1200W RMS KXM Series Marine Class-D Monoblock 1 Ohm Stable Amplifier with Wireless Remote Level Control Knob Included

• 600 Watts RMS x 1 @ 4 ohm
• 1200 Watts RMS x 1 @ 2 ohm
• 1200 Watts RMS x 1 @ 1 ohm (+/- 10%)
• Wireless remote bass level control included
• CEA-2006 Compliant
• Conformal-Coated Circuit Boards
• Black Anodized Aluminum Chassis
• Stainless Steel Mounting Hardware Included

• 600 Watts RMS x 1 @ 4 ohm
• 1200 Watts RMS x 1 @ 2 ohm
• 1200 Watts RMS x 1 @ 1 ohm (+/- 10%)
• Wireless remote bass level control included
• CEA-2006 Compliant
• Conformal-Coated Circuit Boards
• Black Anodized Aluminum Chassis
• Stainless Steel Mounting Hardware Included

Crunch PZ1800.2 (Factory Refurbished)

1800W Max PowerZone Series 2-Channel Class AB Car Amplifier

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Crunch PZ1800.2 (Factory Refurbished)

1800W Max PowerZone Series 2-Channel Class AB Car Amplifier

• 1800 Watts Max
• 900 Watts x 2 Chan. @ 2 Ohm
• 4-Way System Protection
• Selectable Highpass/Lowpass Filters
• Speaker-level (high-level) inputs
• Signal to Noise Ration: >90 dB

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• 1800 Watts Max
• 900 Watts x 2 Chan. @ 2 Ohm
• 4-Way System Protection
• Selectable Highpass/Lowpass Filters
• Speaker-level (high-level) inputs
• Signal to Noise Ration: >90 dB

Audiopipe AQX-1800.1

1800W, Class D Monoblock Elite Series Car Amplifier

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Audiopipe AQX-1800.1

1800W, Class D Monoblock Elite Series Car Amplifier

• • • • • Description Coming Soon! • • • • •

• • • • • Description Coming Soon! • • • • •

Crunch PZX900.4 (Factory Refurbished)

900W 4-Channel Powerzone Series Class AB Car Amplifier

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Crunch PZX900.4 (Factory Refurbished)

900W 4-Channel Powerzone Series Class AB Car Amplifier

• Max Power: 115W x 4 @ 4 ohm, 225W x 4 @ 2 ohm, 450W x 2 @ 4 ohm Mono Bridged
• Total Peak Power: 900W
• Rugged MOSFET Pulse Width Modulation Power Supply
• Speaker-level (high-level) inputs
• Preamp RCA outputs to daisy chain multiple amps
• Frequency Response: 10 - 45,000 Hz

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• Max Power: 115W x 4 @ 4 ohm, 225W x 4 @ 2 ohm, 450W x 2 @ 4 ohm Mono Bridged
• Total Peak Power: 900W
• Rugged MOSFET Pulse Width Modulation Power Supply
• Speaker-level (high-level) inputs
• Preamp RCA outputs to daisy chain multiple amps
• Frequency Response: 10 - 45,000 Hz

MTX Audio TC8001 R/B

2400W Max, Class D MonoBlock Amplifier

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MTX Audio TC8001 R/B

2400W Max, Class D MonoBlock Amplifier

800 watts RMS, Class D MonoBlock Amplifier • 400 watts x 1 chan. @ 4 ohm • Patented State-of-the-Art Power Supply • CEA-2006 Compliant • Adjustable Bass Boost and Remote Subwoofer Control • Defeatable Subsonic Filter • High Level Input • RCA Inputs and Output

800 watts RMS, Class D MonoBlock Amplifier • 400 watts x 1 chan. @ 4 ohm • Patented State-of-the-Art Power Supply • CEA-2006 Compliant • Adjustable Bass Boost and Remote Subwoofer Control • Defeatable Subsonic Filter • High Level Input • RCA Inputs and Output

Kenwood KAC-9104D R/B

1800W Max, Class D Monoblock Amplifier

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Kenwood KAC-9104D R/B

1800W Max, Class D Monoblock Amplifier

Class D Monoblock Car Amplifier • 500W x 1 chan. @ 4 ohm • 900W x 1 chan. @ 2 ohm • >900W x 1 chan. @ 1 ohm • 1800W x 1 chan. Max • Stackable operation capable • Speaker-level inputs • Preamp RCA outputs • Built-in cooling fan

Class D Monoblock Car Amplifier • 500W x 1 chan. @ 4 ohm • 900W x 1 chan. @ 2 ohm • >900W x 1 chan. @ 1 ohm • 1800W x 1 chan. Max • Stackable operation capable • Speaker-level inputs • Preamp RCA outputs • Built-in cooling fan

Power Acoustik REACT1-1800 R/B

1800W Max Reactor Series Class D Monoblock Amplifier

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Power Acoustik REACT1-1800 R/B

1800W Max Reactor Series Class D Monoblock Amplifier

Reactor Series Class D Monoblock Car Amplifier • 500W x 1 chan. @ 4 ohm • 700W x 1 chan. @ 2 ohm • 1800W x 1 chan. Max • PWM MOSFET Power supply • High level input • RCA Output • High rail voltage

Reactor Series Class D Monoblock Car Amplifier • 500W x 1 chan. @ 4 ohm • 700W x 1 chan. @ 2 ohm • 1800W x 1 chan. Max • PWM MOSFET Power supply • High level input • RCA Output • High rail voltage

JL Audio XD700/5

700W RMS, 5-Channel Class D XD Series Car Amplifier

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JL Audio XD700/5

700W RMS, 5-Channel Class D XD Series Car Amplifier

• Full-Range RMS: 75W x 4 @ 4 ohm, 100 x 4 @ 2 ohm
• Subwoofer RMS: 180W x 1 @ 4 ohm, 240W x 1 @ 2 ohm, 300W x 1 @ 1 ohm
• NexD Switching Technology
• State-of-the-Art Microelectronic Components
• Balanced Differential Inputs
• Dimensions: 8-9/16"L x 7-1/8"W x 2-1/16"H

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• Full-Range RMS: 75W x 4 @ 4 ohm, 100 x 4 @ 2 ohm
• Subwoofer RMS: 180W x 1 @ 4 ohm, 240W x 1 @ 2 ohm, 300W x 1 @ 1 ohm
• NexD Switching Technology
• State-of-the-Art Microelectronic Components
• Balanced Differential Inputs
• Dimensions: 8-9/16"L x 7-1/8"W x 2-1/16"H

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    FAQ Frequently asked questions in Discontinued Class-D Amplifiers

    Class D Amplifiers Frequently Asked Questions (FAQ)
    Class D amplifiers are a type of switching amplifier known for their high efficiency and compact size. Unlike traditional Class A, B, and AB amplifiers that use continuous analog voltage to amplify audio signals, Class D amplifiers employ a digital switching technique. This process rapidly switches the output transistors on and off, effectively turning them into binary switches that deliver the audio signal to the speaker. The switching nature of Class D amplifiers drastically reduces power wastage, resulting in higher efficiency and less heat production. As a result, Class D amplifiers are ideal for applications with limited space or power constraints, making them popular in car audio, home theater systems, and portable devices.
    Yes, modern Class D amplifiers have made significant advancements in audio fidelity and can deliver high-quality sound performance. While traditional audiophiles may have associated Class D with lower audio quality due to early models' limitations, today's Class D amplifiers have overcome many of these challenges. With advancements in switching technology, filtering, and feedback mechanisms, Class D amplifiers can now offer exceptional audio reproduction that rivals traditional Class AB amplifiers. Additionally, Class D amplifiers' efficiency and lower heat generation make them well-suited for high-power audio applications where traditional amplifiers would be impractical.
    Yes, Class D amplifiers are versatile and can power various speaker types, including subwoofers, woofers, mid-range, and tweeters. When selecting a Class D amplifier for your speakers, consider the power output (wattage) and impedance rating. Ensure that the amplifier's power rating matches or slightly exceeds your speakers' power handling capabilities to prevent underpowering or overpowering, which can lead to distortion or speaker damage. Additionally, check the amplifier's impedance range to ensure compatibility with your speakers' impedance. Most Class D amplifiers can handle both 4-ohm and 2-ohm loads, making them suitable for a wide range of speaker configurations.
    No, Class D amplifiers are known for their high efficiency, which results in significantly less heat generation compared to other amplifier classes like Class A or Class AB. The digital switching technique used in Class D amplifiers reduces power loss, resulting in a more efficient conversion of electrical energy into audio output. As a result, Class D amplifiers remain relatively cool even at high volume levels, making them suitable for space-constrained installations and applications where heat dissipation is a concern. Their cool operation also extends the lifespan of internal components and reduces the need for large heat sinks or fans.
    Yes, many Class D amplifiers support bridge mode, allowing you to increase the power output when driving a single speaker or subwoofer. In bridge mode, the amplifier combines the power output from two channels into a single channel, effectively doubling the power delivered to the speaker. However, it's essential to follow the manufacturer's guidelines and ensure that your amplifier supports bridging. Additionally, pay attention to the speaker's impedance requirements, as bridging may change the amplifier's impedance capabilities. If you're unsure or need assistance with bridging your Class D amplifier, contact Sonic Electronix's knowledgeable staff, who can help you find the right amplifier and configuration for your audio setup. With their compact size, high efficiency, and versatility, Class D amplifiers offer a compelling solution for various audio applications, delivering powerful and clear sound performance with minimal heat output.
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