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JL Audio® Monoblock Class D Subwoofer Amplifier

At a Glance

JL Audio® Monoblock Class D Subwoofer Amplifier with 500 watts x 1 @ 2 O and 250 watts x 1 @ 4 O

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Born to produce a whopping 500 watts into 2 ohms (14.4V, 1% THD), the RD500/1 amplifier was engineered to generate tons of pure subwoofer bliss from a sleek, ultra-compact chassis. The secret behind its power proficiency is our proprietary NexD™ switching technology, which delivers large amounts of power output with precise efficiency and ultra-low distortion.

For your convenience, the RD500/1’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-balanced inputs are also on-hand, 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 RD500/1 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 RD500/1 features a durable, black powder-coated finish and a top-mounted, dual-color LED light strip that reports the overall status and condition. With the addition of an RBC-1 remote level control (sold separately), you can control the subwoofer output directly from the driver’s seat.

Rated Continuous (RMS) Power @ 14.4 V

@ 4 Ω: 250 W RMS x 1

@ 3 Ω: 350 W RMS x 1

@ 2 Ω: 500 W RMS x 1

Rated Continuous (RMS) Power @ 12.5 V

@ 4 Ω: 225 W RMS x 1

@ 3 Ω: 300 W RMS x 1

@ 2 Ω: 400 W RMS x 1

Specifications

Frequency Response: 7 Hz - 500 Hz (+0, -1dB)

S/N Ratio, referred to highest rated power: >80 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth)

S/N Ratio, referred to 1 W: >60 dB (A-weighted, 20 Hz - 20 kHz noise bandwidth)

Damping Factor @ 4 Ω: >1000 / 50 Hz

Damping Factor @ 2 Ω: >500 / 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: 4 AWG wire

Fuse Rating: 50 A (AFS, AGU or MaxiFuse™)

Signal Processing

Filter Mode(s): Low-Pass only

Filter Slope(s): 12 dB/octave

Filter Frequency Range: 50 Hz - 500 Hz

Bass Boost EQ: Yes

Remote Subwoofer Level Control: Optional (RBC-1)

Pass-Through Preamp Output: Buffered