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HD Amplifiers

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An angled view of an HD900 amplifier in a dark sleek setting.
An angled view of an HD900 amplifier in a dark sleek setting.

HD: Ultra-compact and ultra-powerful.

When the HD amplifiers were introduced in 2008, they wowed the industry with their amazing technological content and impressive power density. Subsequent and continued success in the marketplace is testament to the excellence of their design. They remain unmatched in offering compact packaging, along with the flexibility and stability of our Regulated, Intelligent Power Supply (R.I.P.S.) technologies.

“Small” is not the only story here. Making a small amplifier is great, of course... but not if power and sound quality are sacrificed. Our engineering team focused on achieving world-class fidelity first, and then on making our HD amplifiers amazingly powerful, efficient and small. These efforts led to a remarkable switching amplifier technology called Single Cycle Control™, which allowed all of these goals to be achieved.

This exclusive core amplifier technology is mated to our regulated, intelligent power supply (R.I.P.S.), advanced thermal management systems and a full complement of studio-grade processing features. Behind every HD’s removable security cover, you will find studio-grade signal processing with fully variable crossover filters. Also included are our noise-killing, highly flexible differential-balanced inputs with remote level control capabilities via the HD-RLC remote level control (optional).

We invite you to sonically compare the HD amplifiers to any amplifier, at any price. We think you will quickly discover that all the old amplifier compromises are suddenly irrelevant.

Studio-Grade Signal Processing

Security cover conceals and protects all controls.

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An HD amplifier in a dark setting.
An HD amplifier in a dark setting.

R.I.P.S. - Regulated Intelligent Power Supply

Ensures remarkably consistent power delivery over a wide range of battery voltages and load impedances.

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A series of 4 HD amps lined up vertically.
A series of 4 HD amps lined up vertically.

Single Cycle Control

Groundbreaking amplifier technology delivers world-class fidelity, power and performance from an impossibly small package.

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A pair of HD amplifiers stacked on top of each other.


HD Amplifiers feature JL Audio’s exclusive R.I.P.S. (Regulated, Intelligent Power Supply) technology to maintain rock-solid audio performance with any speaker load from 1.5 - 4 ohms, even with fluctuating battery voltage. This is a feature you won’t find on any other amplifier.

Simply sophisticated.

Removable power and speaker plugs permit high-integrity connections in tight mounting locations.

The input panel of a HD amplifier.

Flexible Mounting

Lateral mounting feet permits installation in very tight space applications.

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An overhead close up view of the feet of an HD amp.
An overhead close up view of the feet of an HD amp.

Monoblock Class D Wide-Range Amplifier, 750 W

Monoblock Class D Wide-Range Amplifier, 1200 W

4 Ch. Class D Full-Range Amplifier, 600 W

5 Ch. Class D System Amplifier, 900 W