JL Audio HD1200/1 : Monoblock Class D Wide-Range Amplifier, 1200W Mono @ 1.5-4Ω
General Specs
Frequency Response |
6 Hz - 8 kHz (+0, -1dB) |
S/N Ratio, referred to highest rated power |
>110 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth) |
S/N Ratio, referred to 1 W (Main Channels) |
>79 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth) |
Damping Factor @ 4 Ω |
>500 / 50 Hz |
Damping Factor @ 2 Ω |
>250 / 50 Hz |
THD+N @ Rated Power (Main Channels) |
<0.03% @ 4 Ω |
Input Voltage Range @ RCA Inputs |
Switchable from 200 mV - 2 V RMS (Low) to 800 mV - 8 V RMS (High) |
Min.Copper Power / Ground Wire Gauge |
2 AWG wire |
Fuse Rating |
100 A (AFS, AGU or MaxiFuse™) |
@ 4 Ω |
1200 W RMS x 1 |
@ 3 Ω |
1200 W RMS x 1 |
@ 2 Ω |
1200 W RMS x 1 |
@ 1.5 Ω |
1200 W RMS x 1 |
JL's most powerful HD amplifier employs their advanced Single-Cycle Control switching design and R.I.P.S. technology to deliver 1200 W of clean power into any impedance between 1.5 and 4 Ω, giving you the highest degree of flexibility in designing your subwoofer system. Tight power supply regulation keeps distortion down and maximizes your bass quality. From a pure sound quality perspective, JL invites 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.
While targeted primarily to subwoofer applications, the HD1200/1 is a wide-range amplifier and can also be used to drive high-performance mid-range speaker systems.
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.
Signal Processing
Filter Mode(s) |
Low-Pass or High-Pass |
Filter Slope(s) |
12/24 dB/octave |
Filter Frequency Range |
50 Hz - 500 Hz |
Detented, Calibrated Filter Freq. Potentiometer |
Yes |
Filter Defeat Function |
Yes |
Infrasonic Filter |
30 Hz, defeatable |
Bass Boost EQ |
No |
Output Polarity Switch |
Yes |
Remote Subwoofer Level Control |
Optional (HD-RLC) |
Remote Bass EQ Boost Control |
No |
Pass-Through Preamp Output |
Buffered |
Physical Specs

Height (H) |
1.93 in / 49 mm |
Width (W) |
10.74 in / 273 mm |
Depth (D) |
8.29 in / 211 mm |
Net Weight |
6.6 lb / 2.99 kg |