JL AUDIO (HD600/4) 4-CHANNEL CLASS-D FULL-RANGE AMPLIFIER. 150 WATTS X 4 @ 1.5-4 OHMS OVERVIEW: 4-Channel Class D Full-Range Amplifier, 150 W x 4 @ 1.5-4 Ω This 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. RATED CONTINUOUS (RMS) POWER @ 14.4 V @ 4 Ω : 150 W RMS x 4 @ 3 Ω : 150 W RMS x 4 @ 2 Ω : 150 W RMS x 4 @ 1.5 Ω : 1500 W RMS x 4 Bridged @ 8 Ω : 300 W RMS x 2 Bridged @ 4 Ω : 300 W RMS x 2 RATED CONTINUOUS (RMS) POWER @ 12.5 V @ 4 Ω : 150 W RMS x 4 @ 3 Ω : 150 W RMS x 4 @ 2 Ω : 150 W RMS x 4 @ 1.5 Ω : 1500 W RMS x 4 Bridged @ 8 Ω : 300 W RMS x 2 Bridged @ 4 Ω : 300 W RMS x 2 GENERAL SPECIFICATIONS: Frequency Response : Hz - 30 kHz (+0, -1dB) S/N Ratio, referred to highest rated power : >110 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth) S/N Ratio, referred to 1 W (Main Channels) : 88.2 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth) Damping Factor @ 4 Ω : >300 / 50 Hz Damping Factor @ 2 Ω : >150 / 50 Hz THD+N @ Rated Power (Main Channels) :