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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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You are currently viewing discontinued products.

Kicker KXM400.4 (40KXM4004)

400W KXM Series 4-Channel Class D-IC Stereo Bridgeable Marine Power Amplifier

40KXM400.4 big DISCONTINUED
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Kicker KXM400.4 (40KXM4004)

400W KXM Series 4-Channel Class D-IC Stereo Bridgeable Marine Power Amplifier

• 50W x 4-Chan. @ 4 ohm
• 100W x 4-Chan. @ 2 ohm
• Bridged: 200W x 2 Chan. @ 4 ohm
• 3-Way System Protection
• Single Channel Operation
• 4 Gauge Power and Ground Inputs
• Stylish Magnetic Panel Covers Tuning Options for Clean Install

• 50W x 4-Chan. @ 4 ohm
• 100W x 4-Chan. @ 2 ohm
• Bridged: 200W x 2 Chan. @ 4 ohm
• 3-Way System Protection
• Single Channel Operation
• 4 Gauge Power and Ground Inputs
• Stylish Magnetic Panel Covers Tuning Options for Clean Install

Polk Audio PA D4000.4 (PAD4000.4) - Open Box, Good Condition (Used)

800W RMS PA D Series Class-D 4-Channel Car Amplifier Open Box Complete (Good, Used)

PA D4000.4 big DISCONTINUED
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Polk Audio PA D4000.4 (PAD4000.4) - Open Box, Good Condition (Used)

800W RMS PA D Series Class-D 4-Channel Car Amplifier Open Box Complete (Good, Used)

• 125 Watts RMS x 4 @ 4 ohm
• 200 Watts RMS x 4 @ 2 ohm
• 400 Watts RMS x 2 @ 4 ohm, Bridged
• 4, 3 and 2 Channel Operation
• CEA-2006 Compliant
• Frequency Response: 20 - 20,000 Hz
• Selectable crossover modes: LPF / FULL / HPF , with 10x Multiplier
• Dimensions: 6-3/4" W x 10-15/16" L x 1-13/16" H

• 125 Watts RMS x 4 @ 4 ohm
• 200 Watts RMS x 4 @ 2 ohm
• 400 Watts RMS x 2 @ 4 ohm, Bridged
• 4, 3 and 2 Channel Operation
• CEA-2006 Compliant
• Frequency Response: 20 - 20,000 Hz
• Selectable crossover modes: LPF / FULL / HPF , with 10x Multiplier
• Dimensions: 6-3/4" W x 10-15/16" L x 1-13/16" H

Alpine MRX-M50

500W RMS, Monoblock Class D X-Power Series Car Amplifier

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Alpine MRX-M50

500W RMS, Monoblock Class D X-Power Series Car Amplifier

MRX Series Monoblock Car Amplifier • 300W RMS @ 4 Ohm x 1 Chan. • 500W RMS @ 2 Ohm x 1 Chan. • 300W RMS @ 1 Ohm x 1 Chan. • Variable Low-Pass Crossover • Variable Subsonic Crossover • Variable Bass Boost

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MRX Series Monoblock Car Amplifier • 300W RMS @ 4 Ohm x 1 Chan. • 500W RMS @ 2 Ohm x 1 Chan. • 300W RMS @ 1 Ohm x 1 Chan. • Variable Low-Pass Crossover • Variable Subsonic Crossover • Variable Bass Boost

Kenwood KAC-8103D

1000W max. Class D Monoblock Amplifier

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Kenwood KAC-8103D

1000W max. Class D Monoblock Amplifier

100 watt Class D Monoblock Amplifier • 300W RMS x 1 @ 4 ohm • 500W RMS x 1 @ 2 ohm • Variable Low-Pass and Infrasonic Filter • S/N Ratio is 85 dB

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100 watt Class D Monoblock Amplifier • 300W RMS x 1 @ 4 ohm • 500W RMS x 1 @ 2 ohm • Variable Low-Pass and Infrasonic Filter • S/N Ratio is 85 dB

Kicker IX500.1 (10IX500.1)

500W RMS, Monoblock Class D IX Series Amplifier (IX5001)

10IX500.1 big DISCONTINUED
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Kicker IX500.1 (10IX500.1)

500W RMS, Monoblock Class D IX Series Amplifier (IX5001)

IX Series Monoblock Class D Car Amplifier • 500W x 1-Chan. @ 2 Ohm • 275W x 1-Chan. @ 4 Ohm • Super-Small Footprint • Optional Stacking Mounts Available • Optional Vinyl Skins For Personalization

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IX Series Monoblock Class D Car Amplifier • 500W x 1-Chan. @ 2 Ohm • 275W x 1-Chan. @ 4 Ohm • Super-Small Footprint • Optional Stacking Mounts Available • Optional Vinyl Skins For Personalization

Rockford Fosgate P1000X4D

1000W RMS 4-Channel Class D Punch Series High Efficiency Amplifier

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Rockford Fosgate P1000X4D

1000W RMS 4-Channel Class D Punch Series High Efficiency Amplifier

Punch Series Class D Full Range 4-Channel Car Amplifier • 150W x 4 Chan. @ 4 ohm • 250W x 4 Chan. @ 2 ohm • 500W x 2 Chan. @ 4 ohm Bridged • Punch EQ 2 Variable Bass Boost • High/Low Pass Crossovers • CEA-2006 Compliant

Punch Series Class D Full Range 4-Channel Car Amplifier • 150W x 4 Chan. @ 4 ohm • 250W x 4 Chan. @ 2 ohm • 500W x 2 Chan. @ 4 ohm Bridged • Punch EQ 2 Variable Bass Boost • High/Low Pass Crossovers • CEA-2006 Compliant

Kenwood KAC-9106D Open Box Complete

1000W RMS Class D Monoblock Performance Series Car Amplifier

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Kenwood KAC-9106D Open Box Complete

1000W RMS Class D Monoblock Performance Series Car Amplifier

• FEATURE 1
• FEATURE 2
• FEATURE 3
• FEATURE 4
• FEATURE 5
• FEATURE 6
• FEATURE 7

• FEATURE 1
• FEATURE 2
• FEATURE 3
• FEATURE 4
• FEATURE 5
• FEATURE 6
• FEATURE 7

MB Quart ONX1.1600D (Factory Refurbished)

1600W RMS ONYX Series Class D Monoblock Amplifier (ONX-1.1600D)

ONX1.1600D-2 big DISCONTINUED
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MB Quart ONX1.1600D (Factory Refurbished)

1600W RMS ONYX Series Class D Monoblock Amplifier (ONX-1.1600D)

• ONYX Series Monoblock Class D Car Amplifier
• 1600W x 1 Chan @ 1 Ohm
• 1100W x 1 Chan @ 2 Ohm
• Dual Speaker Terminals
• Preamp RCA Outputs
• 4-Way System Protection Circuitry
• Piano Black Gloss Finish

• ONYX Series Monoblock Class D Car Amplifier
• 1600W x 1 Chan @ 1 Ohm
• 1100W x 1 Chan @ 2 Ohm
• Dual Speaker Terminals
• Preamp RCA Outputs
• 4-Way System Protection Circuitry
• Piano Black Gloss Finish

EXCLUSIVE

DLS X-D30

730W RMS, X-Program 3-Channel Class D Amplifier (12-31030)

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DLS X-D30

730W RMS, X-Program 3-Channel Class D Amplifier (12-31030)

X-Program 3-Channel Class D Car Amplifier • 730W RMS • Variable Bass Boost • Speaker-Level Inputs • Preamp RCA Outputs • Variable Low/High-Pass Filters • 3-Way System Protection Circuitry • Fully Variable Phase Shift

X-Program 3-Channel Class D Car Amplifier • 730W RMS • Variable Bass Boost • Speaker-Level Inputs • Preamp RCA Outputs • Variable Low/High-Pass Filters • 3-Way System Protection Circuitry • Fully Variable Phase Shift

Autotek MM4000.1D R/B

4000W RMS Mean Machine Series Class D 2-Channel Amplifier (MM40001D)

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Autotek MM4000.1D R/B

4000W RMS Mean Machine Series Class D 2-Channel Amplifier (MM40001D)

Mean Machine Series 2-Channel Class D Car Amplifier • 900 Watts x 2 Chan @ 4 Ohm • 1400 Watts x 2 Chan @ 2 Ohm • 2000 Watts x 2 Chan @ 1 Ohm • MOSFET Power Supply • LED Power Indicators • TCID (Twin Coil Isolation Design)

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Mean Machine Series 2-Channel Class D Car Amplifier • 900 Watts x 2 Chan @ 4 Ohm • 1400 Watts x 2 Chan @ 2 Ohm • 2000 Watts x 2 Chan @ 1 Ohm • MOSFET Power Supply • LED Power Indicators • TCID (Twin Coil Isolation Design)

Boston Acoustics GTA-800M

800W RMS, GTA Series Class D Monoblock Car Amplifier

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Boston Acoustics GTA-800M

800W RMS, GTA Series Class D Monoblock Car Amplifier

GTA Series Monoblock Class D Car Amplifier • 800W RMS • 500 Watts x 1 Chan. @ 4 Ohm • 800 Watts x 1 Chan. @ 2 Ohm • Q-Tune™ Bass Optimization Circuitry • SST™ (Symmetrical Signal Topology) • Wrap-Around Heatsink

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GTA Series Monoblock Class D Car Amplifier • 800W RMS • 500 Watts x 1 Chan. @ 4 Ohm • 800 Watts x 1 Chan. @ 2 Ohm • Q-Tune™ Bass Optimization Circuitry • SST™ (Symmetrical Signal Topology) • Wrap-Around Heatsink

Audiobahn A4KDN

Class D Monoblock Amplifier

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Audiobahn A4KDN

Class D Monoblock Amplifier

Class-D Competition Amplifier • 4000W RMS x 1 @ 1 • Digital Voltmeter • Remote Bass Knob • Chrome Plated Finish • Cobalt Blue Illumination • Dual Cooling Fans • Bridgeable

Class-D Competition Amplifier • 4000W RMS x 1 @ 1 • Digital Voltmeter • Remote Bass Knob • Chrome Plated Finish • Cobalt Blue Illumination • Dual Cooling Fans • Bridgeable

Hifonics HFI1000.1D-OPEN BOX

1000W RMS Class D Monoblock HFi Series Amplifier

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Hifonics HFI1000.1D-OPEN BOX

1000W RMS Class D Monoblock HFi Series Amplifier

HFi Series Monoblock Class D Car Amplifier • 750W x 1-Chan. @ 2 Ohm • 1000W x 1-Chan. @ 1 Ohm • Wired HFR-3 Bass Remote • 4-Way System Protection Circuitry • Preamp RCA Outputs • Blue Illuminated Hifonics Badge

HFi Series Monoblock Class D Car Amplifier • 750W x 1-Chan. @ 2 Ohm • 1000W x 1-Chan. @ 1 Ohm • Wired HFR-3 Bass Remote • 4-Way System Protection Circuitry • Preamp RCA Outputs • Blue Illuminated Hifonics Badge

EXCLUSIVE

NVX MVPA1 Monoblock Amplifier + 50% OFF True Spec Pure OFC Copper 8 Gauge Installation Kit

Micro-V Series 300W Monoblock Class D Compact Amplifier with 100% Copper, 2-Ch True Spec 8 Gauge Installation Kit

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NVX MVPA1 Monoblock Amplifier + 50% OFF True Spec Pure OFC Copper 8 Gauge Installation Kit

Micro-V Series 300W Monoblock Class D Compact Amplifier with 100% Copper, 2-Ch True Spec 8 Gauge Installation Kit

• Incredibly Tiny! The size of a postcard!
• RMS: 200 x 1 @ 4 ohm, 300W x 1 @ 2 ohm
• Total RMS Power: 300W
• CEA-2006 Compliant
• Switchable Bass Boost: (0dB/+6dB/+12dB)
• Extremely Small Footprint
• Dimensions: 4"W x 5-7/16"L x 1-9/16"H
• 8 Gauge 2-Channel Complete Amplifier Installation Kit
• For Car Audio Systems Up To 600 Watts RMS
• Silver-Tinned 100% Virgin Copper
• 2-channel RCA Interconnect Cable

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• Incredibly Tiny! The size of a postcard!
• RMS: 200 x 1 @ 4 ohm, 300W x 1 @ 2 ohm
• Total RMS Power: 300W
• CEA-2006 Compliant
• Switchable Bass Boost: (0dB/+6dB/+12dB)
• Extremely Small Footprint
• Dimensions: 4"W x 5-7/16"L x 1-9/16"H
• 8 Gauge 2-Channel Complete Amplifier Installation Kit
• For Car Audio Systems Up To 600 Watts RMS
• Silver-Tinned 100% Virgin Copper
• 2-channel RCA Interconnect Cable

Hifonics Hercules 4K

2000W RMS 1-Channel Monoblock Mt. Olympus Series Class D Amplifier

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Hifonics Hercules 4K

2000W RMS 1-Channel Monoblock Mt. Olympus Series Class D Amplifier

• RMS Power: 900W x 1 @ 4 ohm, 1600W x 1 @ 2 ohm, 2000W x 1 @ 1 ohm
• Built-in Parametric Equalizer
• +12dB Variable Bass Boost
• Dimensions: 19-3/4" L x 9"W x 2-3/4" H

• RMS Power: 900W x 1 @ 4 ohm, 1600W x 1 @ 2 ohm, 2000W x 1 @ 1 ohm
• Built-in Parametric Equalizer
• +12dB Variable Bass Boost
• Dimensions: 19-3/4" L x 9"W x 2-3/4" H

Hifonics Zeus ZRX2400.1D

2400W Max Class D Monoblock Zeus Series Amplifier (Open Box Complete)

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Hifonics Zeus ZRX2400.1D

2400W Max Class D Monoblock Zeus Series Amplifier (Open Box Complete)

• Peak: 650W x 1 @ 4 ohm, 1200W x 1 @ 2 ohm, 2400W x 1 @ 1 ohm
• Total Peak Power: 2400W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 50 Hz
• Wired Bass Remote Included
• Dimensions: 17-3/16"L x 10"W x 2-7/16"H

• Peak: 650W x 1 @ 4 ohm, 1200W x 1 @ 2 ohm, 2400W x 1 @ 1 ohm
• Total Peak Power: 2400W
• Class D Circuitry
• Variable Bass Boost: 0 to +10 dB at 50 Hz
• Wired Bass Remote Included
• Dimensions: 17-3/16"L x 10"W x 2-7/16"H

Soundstream EGA 1400D Edge Series EGA1400D

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Soundstream EGA 1400D Edge Series EGA1400D

1-ohm Stable Class D MonoBlock Amplifier

1-ohm Stable Class D MonoBlock Amplifier

Eclipse XA1000

Class D Monoblock Premium Digital Amplifiers Series Amplifier

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Eclipse XA1000

Class D Monoblock Premium Digital Amplifiers Series Amplifier

XA Series 1-Channel Class D Car Amplifier • 320W x 1 chan. @ 4 ohm • 480W x 1 chan. @ 2 ohm • 640W x 1 chan. Max • Tuned Bass EQ (0-8 dB bass boost) • Very high efficiency rate with low current draw

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XA Series 1-Channel Class D Car Amplifier • 320W x 1 chan. @ 4 ohm • 480W x 1 chan. @ 2 ohm • 640W x 1 chan. Max • Tuned Bass EQ (0-8 dB bass boost) • Very high efficiency rate with low current draw

Kicker IX500.2 (11IX500.2)

500W RMS, 2-Channel Class D IX Series Amplifier (IX5002)

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Kicker IX500.2 (11IX500.2)

500W RMS, 2-Channel Class D IX Series Amplifier (IX5002)

• IX Series Class D Car Amplifier
• 4-Channel Operation
• 75W x 4 Chan. @ 4 ohm
• 125W x 4 Chan. @ 2 ohm
• 250W x 2 Chan. Bridged
• 0-18 Bass Boost
• Gold-Plated Terminals
• Small Footprint
• Low and High Pass Filters

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• IX Series Class D Car Amplifier
• 4-Channel Operation
• 75W x 4 Chan. @ 4 ohm
• 125W x 4 Chan. @ 2 ohm
• 250W x 2 Chan. Bridged
• 0-18 Bass Boost
• Gold-Plated Terminals
• Small Footprint
• Low and High Pass Filters

Boss DD3600 R/B

3600W Max, Class D Monoblock Diablo Series Amplifier

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Boss DD3600 R/B

3600W Max, Class D Monoblock Diablo Series Amplifier

Diablo Series Class D Monoblock Car Amplifier • 1350 x 1 chan. @ 4 ohm • 1850 x 1 chan. @ 2 ohm • 3600W x 1 chan. Max • Remote subwoofer control • Variable low pass crossover(24dB) • Input sensitivity selector

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Diablo Series Class D Monoblock Car Amplifier • 1350 x 1 chan. @ 4 ohm • 1850 x 1 chan. @ 2 ohm • 3600W x 1 chan. Max • Remote subwoofer control • Variable low pass crossover(24dB) • Input sensitivity selector

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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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