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JL Audio RD1500/1 - Monoblock Class D Subwoofer Amplifier


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Engineered for high-power, subwoofer applications, the JL Audio RD1500/1 - Monoblock Class D Subwoofer Amplifier is built to deliver staggering amounts of world-class bass output. Equipped with a special low impedance circuit, the RD1500/1 is capable of generating a whopping 1500 watts of output power, at either 1 or 2 ohms (14.4V, 1% THD). At the heart of this ultra-sleek and compact power plant is JL Audio’s exclusive NexD™ Class D technology, permitting high power output with exceptional efficiency and low distortion.

For your convenience, all of the RD1500/1’s controls are located on top of the amplifier, beneath a protective cover, with all connections found along one side of its chassis. Signal processing features include a 12 dB / octave low-pass filter, with continuously variable frequency selection from 50-500 Hz, and a variable bass boost EQ. Dual-range, differential-balance inputs are also onboard, capable of accepting most input voltage levels. Automatic turn-on capability (via signal sensing or DC-offset sensing) is standard, along with a set of preamp outputs so you can easily pass signals to another amplifier.

The RD1500/1 is also equipped with an onboard LED-clipping indicator. This all-new, innovative feature lets you easily set your amplifier’s input sensitivity setting, quickly and accurately, with no special equipment needed. The RD1500/1 features a durable, black powder-coated finish and a top-mounted, dual-color LED light strip that reports the overall status and condition. Control of the subwoofer level from the driver’s seat is easily accomplished with the addition of the optional RBC-1 remote level control (sold separately).

Technical Specifications

Rated Continuous (RMS) Power @ 14.4 V

@ 4 Ω - 750 W RMS x 1

@ 3 Ω - 1000 W RMS x 1

@ 2 Ω - 1500 W RMS x 1

@ 1 Ω - 1500 W RMS x 1

Rated Continuous (RMS) Power @ 12.5 V

@ 4 Ω - 750 W RMS x 1

@ 3 Ω - 1000 W RMS x 1

@ 2 Ω - 1500 W RMS x 1

@ 1 Ω - 1500 W RMS x 1

Frequency Response 7 Hz - 500 Hz (+0, -1dB)
S/N Ratio, referred to highest rated power >82 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)
S/N Ratio, referred to 1 W >50 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)
Damping Factor @ 4 Ω >1100 / 50 Hz
Damping Factor @ 2 Ω >550 / 50 Hz
THD+N @ Rated Power <1% @ 2 Ω per Ch.
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 150A (AFS or AGU)


  • Height (H): 2.13 in / 54 mm
  • Width (W): 18.05 in / 458 mm
  • Depth (D): 6.96 in / 177 mm

Further Information

JL Audio RD1500/1 - Monoblock Class D Subwoofer Amplifier - User Manual

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