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

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.
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.

Full (AP),
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.
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.
Amp Bluetooth Connectivity
This feature will tell you if the amplifier has the capability to connect to a Bluetooth device.
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NVX VADM4 v2 (VADM4v2)

500W RMS Class D V-Series Micro Full-Range 4-Channel Car/Marine/Powersports Amplifier

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NVX VADM4 v2 (VADM4v2)

500W RMS Class D V-Series Micro Full-Range 4-Channel Car/Marine/Powersports Amplifier

• 80 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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NVX NDA6004

1200W Peak (600W RMS) Class D N-Series 4-Channel Amplifier

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NVX NDA6004

1200W Peak (600W RMS) Class D N-Series 4-Channel Amplifier

• 100 watts x 4 channel @ 4 ohm
• 160 watts x 4 channel @ 2 ohm
• Bridged: 320 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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NVX VAD10004 v2 (VAD10004v2)

1000W RMS Class D Full Range 4-Channel Car/Marine/Powersports Amplifier

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NVX VAD10004 v2 (VAD10004v2)

1000W RMS Class D Full Range 4-Channel Car/Marine/Powersports Amplifier

• 150 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1000 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Rockford Fosgate Prime R2 R2-200X2

200W RMS Class D Prime Series 2 Channel Car Amplifier

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Rockford Fosgate Prime R2 R2-200X2

200W RMS Class D Prime Series 2 Channel Car Amplifier

• 50 watts x 2 channel @ 4 ohm
• 100 watts x 2 channel @ 2 ohm
• Bridged: 200 watts x 1 channel @ 4 ohm
• Total RMS Power: 200 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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AudioControl LC-5.1300

1300W RMS Class D LC Series 5-Channel Car Amplifier with AccuBass

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AudioControl LC-5.1300

1300W RMS Class D LC Series 5-Channel Car Amplifier with AccuBass

• 100 watts x 4 channel + 300 watts x 1 channel @ 4 ohm
• 200 watts x 4 channel + 500 watts x 1 channel @ 2 ohm
• Bridged: 400 watts x 2 channel @ 4 ohm + 500 watts x 1 channel @ 2 ohm
• Total RMS Power: 1300 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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Rockford Fosgate Prime R2 R2-500X4

500W RMS Class D Prime Series 4 Channel Car Amplifier

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Rockford Fosgate Prime R2 R2-500X4

500W RMS Class D Prime Series 4 Channel Car Amplifier

• 75 watts x 4 channel @ 4 ohm
• 125 watts x 4 channel @ 2 ohm
• Bridged: 250 watts x 2 channel @ 4 ohm
• Total RMS Power: 500 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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NVX VADM2 v2 (VADM2v2)

600W RMS Class D V-Series Micro Full-Range 2-Channel Car/Marine/Powersports Amplifier

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NVX VADM2 v2 (VADM2v2)

600W RMS Class D V-Series Micro Full-Range 2-Channel Car/Marine/Powersports Amplifier

• 200 watts x 2 channel @ 4 ohm
• 300 watts x 2 channel @ 2 ohm
• Bridged: 600 watts x 1 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 2-Channel Amplifier

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NVX VAD10004v1 Version 1 (Like New (Open Box))

1000W RMS Full Range Class D 4-Channel Car/Marine/Powersports Amplifier

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NVX VAD10004v1 Version 1 (Like New (Open Box))

1000W RMS Full Range Class D 4-Channel Car/Marine/Powersports Amplifier

• 150 watts x 4 channel @ 4 ohm
• 250 watts x 4 channel @ 2 ohm
• Bridged: 500 watts x 2 channel @ 4 ohm
• Total RMS Power: 1000 watts
• CEA-2006 Compliant
• Class D 2 ohm Stable 4-Channel-Channel Amplifier

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Hertz SP 1.900

1000W RMS Class D SPL Show Series Monoblock Car, Motorcycle, Marine, and Powersports Amplifier

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Hertz SP 1.900

1000W RMS Class D SPL Show Series Monoblock Car, Motorcycle, Marine, and Powersports Amplifier

• 600 watts x 1 channel @ 4 ohm
• 1000 watts x 1 channel @ 2 ohm
• 1000 watts x 1 channel @ 1 ohm
• Total RMS Power: 1000 watts
• Class D 1 ohm Stable Monoblock Amplifier

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Deaf Bonce Machete MFA 2.520

1500W RMS Class D Machete Series 2-Channel Full Range Car Amplifier

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Deaf Bonce Machete MFA 2.520

1500W RMS Class D Machete Series 2-Channel Full Range Car Amplifier

• 520 watts x 2 channel @ 4 ohm
• 750 watts x 2 channel @ 2 ohm
• Bridged: 1500 watts x 1 channel @ 4 ohm
• Total RMS Power: 1500 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

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Diamond Audio MICRO85U

1035W RMS Class D Micro8U Series 5-Channel Full Range Car Amplifier

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Diamond Audio MICRO85U

1035W RMS Class D Micro8U Series 5-Channel Full Range Car Amplifier

• + @ 4 ohm
• 85 watts x 1 channel + 375 watts x 1 channel @ 2 ohm
• Bridged: 200 watts x 1 channel @ 4 ohm + 375 watts x 1 channel @ 2 ohm
• Total RMS Power: 1035 watts
• Class D 2 ohm Stable 5-Channel-Channel Amplifier

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DS18 ION700.2D

2100W Peak (700W RMS) Class D iON Series 2-Channel Car Amplifier

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DS18 ION700.2D

2100W Peak (700W RMS) Class D iON Series 2-Channel Car Amplifier

• 240 watts x 2 channel @ 4 ohm
• 350 watts x 2 channel @ 2 ohm
• Bridged: 700 watts x 1 channel @ 4 ohm
• Total RMS Power: 700 watts
• Class D 2 ohm Stable 2-Channel-Channel Amplifier

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JL Audio HD600/4

600W RMS Class D HD Series 4 Channel Car Amplifier

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JL Audio HD600/4

600W RMS Class D HD Series 4 Channel Car Amplifier

• 150 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 1.5 ohm Stable 4-Channel Amplifier

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Kenwood eXcelon XR901-5

900W RMS Class D eXcelon Reference Series 5-Channel Car Amplifier with Bass Remote (Hi-Res Audio Certified)

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Kenwood eXcelon XR901-5

900W RMS Class D eXcelon Reference Series 5-Channel Car Amplifier with Bass Remote (Hi-Res Audio Certified)

• 60 watts x 4 channel + 400 watts x 1 channel @ 4 ohm
• 75 watts x 4 channel + 600 watts x 1 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm + 600 watts x 1 channel @ 2 ohm
• Total RMS Power: 900 watts
• Class D 2 ohm Stable 5-Channel Amplifier

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JL Audio HD750/1

750W RMS Class D HD Series Monoblock Car Amplifier

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JL Audio HD750/1

750W RMS Class D HD Series Monoblock Car Amplifier

• 750 watts x 1 channel @ 4 ohm
• 750 watts x 1 channel @ 2 ohm
• Total RMS Power: 750 watts
• Class D 1.5 ohm Stable Monoblock Amplifier

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Kenwood KAC-M1814

400W Peak (180W RMS) Class D M Series 4-Channel Car, Marine, Powersports, and Motorcycle Amplifier

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Kenwood KAC-M1814

400W Peak (180W RMS) Class D M Series 4-Channel Car, Marine, Powersports, and Motorcycle Amplifier

• 45 watts x 4 channel @ 4 ohm
• 45 watts x 4 channel @ 2 ohm
• Bridged: 90 watts x 2 channel @ 4 ohm
• Total RMS Power: 180 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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• 45 watts x 4 channel @ 4 ohm
• 45 watts x 4 channel @ 2 ohm
• Bridged: 90 watts x 2 channel @ 4 ohm
• Total RMS Power: 180 watts
• Class D 2 ohm Stable 4-Channel Amplifier

Rockford Fosgate Prime R2 R2-300X4

300W RMS Class D Prime Series 4 Channel Car Amplifier

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Rockford Fosgate Prime R2 R2-300X4

300W RMS Class D Prime Series 4 Channel Car Amplifier

• 50 watts x 4 channel @ 4 ohm
• 75 watts x 4 channel @ 2 ohm
• Bridged: 150 watts x 2 channel @ 4 ohm
• Total RMS Power: 300 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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Diamond Audio MICRO4V2

600W RMS Class D MicroV2 Series 4-Channel Compact Amplifier with Bluetooth

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Diamond Audio MICRO4V2

600W RMS Class D MicroV2 Series 4-Channel Compact Amplifier with Bluetooth

• 80 watts x 4 channel @ 4 ohm
• 150 watts x 4 channel @ 2 ohm
• Bridged: 300 watts x 2 channel @ 4 ohm
• Total RMS Power: 600 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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JBL DSP4086 (DSP4086AM)

1000W Peak 480W RMS Class D 8-Channel Compact Car Amplifier with Digital Signal Processor

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JBL DSP4086 (DSP4086AM)

1000W Peak 480W RMS Class D 8-Channel Compact Car Amplifier with Digital Signal Processor

• 40 watts x 8 channel @ 4 ohm
• 60 watts x 8 channel @ 2 ohm
• Total RMS Power: 320 watts
• Class D 2 ohm Stable 8-Channel Amplifier

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DS18 G3600.4D

3600W Peak (1680W RMS) Class D Gen-X Series 4-Channel Car Amplifier

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DS18 G3600.4D

3600W Peak (1680W RMS) Class D Gen-X Series 4-Channel Car Amplifier

• 300 watts x 4 channel @ 4 ohm
• 420 watts x 4 channel @ 2 ohm
• Bridged: 740 watts x 4 channel @ 4 ohm
• Total RMS Power: 1680 watts
• Class D 2 ohm Stable 4-Channel Amplifier

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    FAQ Frequently asked questions in 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.

    All About Class-D Amplifiers

    Class D Amplifier Information

    Class D Amplifiers are highly efficient with their power and sound signals..At at least 90 percent efficiency, these amplifiers don’t fall prey to frequent heat sinks so less power is drawn from your car’s charging system and overall smaller internal pieces.

    Onboard circuits in the amp create high frequency pulses of DC  current. The width of this current is modified by the input signal. Through pulse width modulation (PWM), the amp can create a bigger singal with a wider pulse for a high power output. 

    Before the final sound output, the signal is run through a transistor that’s either on or off, then through a low-pass filter to smooth out the PWM carrying frequency. This removes move interference and distortion before the music reaches the speakers.

    Sonic Electronix Learning Center: Amplifier Classes

    If you're searching for the best quality class D amplifiers that deliver superior power and efficiency, you've come to the right place. Our extensive collection features only the most reputable brands and models, ensuring that you can find the perfect class D amplifier to elevate your car audio experience.

    Class D amplifiers have revolutionized the world of car audio with their cutting-edge technology and exceptional advantages. These amplifiers are known for their incredible efficiency, converting nearly all of the input power into amplified output. Unlike traditional class AB amplifiers, class D amplifiers produce minimal heat, making them more energy-efficient and reducing the strain on your vehicle's electrical system. With increased efficiency, you can enjoy powerful and dynamic sound without worrying about excessive power consumption.

    One of the main advantages of having a class D amplifier is its compact size and lightweight design. Due to their high efficiency, class D amplifiers can be made smaller and lighter than their counterparts, making them easy to install in limited spaces within your vehicle. Whether you have a compact car or a custom-built audio system, a class D amplifier will seamlessly fit into your setup, providing incredible audio performance without compromising on space.

    In addition to their efficiency and compact size, class D amplifiers deliver outstanding audio quality. Thanks to advancements in technology, modern class D amplifiers can produce pristine sound reproduction across all frequencies, providing crisp highs, punchy mids, and powerful bass. Whether you enjoy smooth jazz, heart-pounding rock, or booming hip-hop, a class D amplifier will ensure that every note is delivered with clarity and precision.

    At Sonic Electronix, we are committed to helping you find the best class D amplifiers for your car audio needs. Our team of audio experts is here to offer personalized assistance throughout your shopping journey. If you have any questions or need guidance on choosing the perfect class D amplifier, don't hesitate to contact us at 1-502-200-8010. Our knowledgeable staff is eager to provide the information you need and help you make an informed decision that will elevate your car audio experience.

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