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.
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 |
@ 1.5 Ω | N/A |
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 |
@ 1.5 Ω | N/A |
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 | 30 Hz, defeatable |
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 |
Physical Specifications

Height (H) | 2.13 in / 54 mm |
Width (W) | 9.78 in / 372 mm |
Depth (D) | 6.96 in / 177 mm |
JL Audio Warranty
Mobile Audio Subwoofer Drivers | JL Audio Subwoofer Drivers are warrantied against defects in materials and workmanship for One (1) Year from purchase date. |
Mobile Audio Amplifiers and Electronic Products | JL Audio Amplifiers and Electronics are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Mobile Audio Speaker Systems | JL Audio Speaker Systems are warrantied against defects in materials and workmanship for One (1) Year from purchase date. |
Mobile Audio Engineered Connection Systems | JL Audio Engineered Connection Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Mobile Audio Enclosed Subwoofer Systems | JL Audio Enclosed Subwoofer Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Stealthbox® Subwoofer Systems | JL Audio Stealthbox® Subwoofer Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Marine Speaker Systems and Subwoofers | JL Audio Marine Speaker Systems and Subwoofers are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Marine Amplifiers and Electronics | JL Audio Marine Amplifiers and Electronics are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Marine Engineered Connection Systems | JL Audio Engineered Connection Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
SlamPak™ Powersports Audio Systems | JL Audio SlamPak™ Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Stealthbox® Powersports Subwoofer Systems | JL Audio Stealthbox® Subwoofer Systems are warrantied against defects in materials and workmanship for Two (2) Years from purchase date. |
Number Of Channels: |
Single Channel |
UPC: |
699440986182 |
RMS Power In Watts: |
251-500 Watts |
Bundle: |
No |
Feature 1: |
Developed in-house by the same engineering team that brought you the XDv2 and HD amplifiers, our latest RD amplifiers utilize JL Audio’s exclusive NexD™ switching technologies to generate loads of power with exceptional efficiency to reduce current d |
Feature 2: |
Developed in-house by the same engineering team that brought you the XDv2 and HD amplifiers, our latest RD amplifiers utilize JL Audio’s exclusive NexD™ switching technologies to generate loads of power with exceptional efficiency to reduce current d |
Feature 3: |
Just like the XDv2 amplifiers, RD amps are equipped with studio-grade signal processing and automatic turn-on capabilities |
Feature 4: |
Differential-balanced inputs are also on-hand to combat noise and maximize compatibility with a wide range of signal types. |
Feature 5: |
Two brand new features have been added to simplify installation and set-up: easy-to-use LED clipping indicators |
Condition: |
NEW |
Manufacturer SKU: |
98618 |
Weight: |
8 lbs |
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JL Audio RD500/1 500W Class D Amp
Amazing Amp, Have it pushing a JL W3 10" Sub in a Stealthbox. Creativeaudio.net shipped it out super fast.