JL Audio HD600/4 4 Ch. 600 Watt 4 Ohm Power Amplifier – #98221

Model Number: HD600/4
UPC: 699440982214
Model Number: HD600/4
UPC: 699440982214

JL Audio HD600/4 #98221 – 4 Channel Power Amplfier

  • 4-channel subwoofer amplifer
  • 150 watts RMS x 4 (rated power from 1.5 to 4 ohms)
  • 300 watts RMS x 2 bridged (rated power from 3 to 8 ohms)
  • Variable high- and low-pass filter (50-500 Hz 12 or 24dB/octave)
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Product Description

Features & Specifications




JL Audio HD600/4 #98221 – 4 Channel Power Amplfier

The JL Audio HD600/4 #98221- 4 Channel Power Amplifier is a compact multi-channel powerhouse employs our Single-Cycle Control switching design and R.I.P.S. technology to deliver 150 W x 4 or 300 W x 2. Tight power supply regulation keeps distortion down and maximizes sound quality.

When using the HD750/1 or HD1200/1 to drive a subwoofer system, the HD600/4 is the ideal satellite amplifier, delivering huge dynamics with pristine resolution. From a pure sound quality perspective, we invite you to compare the real-world, in-car performance of this amplifier to any other amplifier on the market, of any type, at any price.

It can also be deployed on its own as a very capable 3-channel system amplifier with 150 W x 2 to the satellites and 300 W x 1 to a subwoofer system.

This amplifier features a brushed aluminum finish with black powder-coated cast alloy heat sinks and bottom panel. A black powder-coated, gasketed cover is also provided to protect the controls.

Small but big power

JL Audio’s HD Series amplifiers offer high performance from an ultra-compact chassis. These Class D amplifiers use less power, take up less space, and generate less heat than traditional amp designs — you can even stack them up to create a sweet-looking installation.

View of control panel

JL Audio technology goes to work for you

HD Series amplifiers reproduce your music with exceptional accuracy, so you’ll hear high-fidelity sound even under the most demanding conditions. JL Audio uses Single Cycle Control™ technology to eliminate the excessive signal distortion that’s plagued Class D amplifiers in the past. Differential-balanced inputs eliminate noise before it hits the preamp stage, and allow you to connect the amp to just about any in-dash stereo. You’ll hear clear, true, studio-quality audio, exactly what you expect from JL Audio.

4 channels of reliable power

The 4-channel HD600/4 amplifier pushes 150 watts RMS per channel to your speakers or subs, from a 2″ tall chassis that’s about the size of a sheet of computer paper. The regulated power supply allows this amp to deliver its rated power to a wide range of impedances, even when voltage levels drop during heavy use. Removable power and speaker plugs make it easy to pop this amp out if you need the space in your cargo area.


Model HD600/4
Model: HD600/4
Product: JL Audio HD600/4 4 Ch. 600 Watt 4 Ohm Power Amplifier – #98221
Weight 1.1 kg



– RMS Power Output (Watts x Channels): 150 x 4
– Peak Power Output (Watts x Channels): 600 x 2
– Power at 2 Ohms (Watts x Channels): 150 x 4
– Bridged Power (Watts x Channels): 300 x 2
– Minimum Impedance Bridged: 3
– Minimum Impedance Unbridged: 1.5
– Minimum Impedance: 1.5
– Best Frequency Response: 6-30k Hz
– THD at Rated RMS Power: 0.03%
– Signal to Noise Ratio: 110 dB
– Input Voltage: 14.5v
– Amplifier Class: D
– Low-Pass Crossover Frequency: 50-500 Hz
– Low-Pass Slope (dB/octave): 12/24 dB
– High-Pass Crossover Frequency: 50-500 Hz
– High-Pass Slope (dB/octave): 12/24 dB
– Bass Boost: No
– Fan Cooled: No
– Fuse Rating: 50
– Speaker Level Inputs: RCA
– Preamp Outputs: 1 pair
– Width (inches): 8-7/8
– Height (inches): 1-15/16
– Depth (inches): 10-13/16

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JL Audio Canada 2-Year Limited Manufacturers Warranty