JL Audio
RD500/1
Monoblock Class D Subwoofer Amplifier, 500 W x 1 @ 2 Ω / 250 W x 1 @ 4 Ω - 14.4V
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.
Features & Specs
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
General 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
Detented, Calibrated Filter Freq. Potentiometer No
Filter Defeat Function No
Infrasonic Filter No
Bass Boost EQ Yes
Output Polarity Switch No
Remote Subwoofer Level Control Optional (RBC-1)
Remote Bass EQ Boost Control No
Pass-Through Preamp Output Buffered