JL Audio RD400/4 4 Ch. Class D Full-Range Amplifier, 400 W

Sleek and powerful, RD amplifiers offer outstanding amplifier performance and value.

RD amplifiers employ JL Audio’s exclusive NexD™ switching technologies to generate loads of power with exceptional efficiency, reducing current draw and heat. Each model features a modern, industrial design with a high performance look and finish. For ease of installation and making adjustments, all connections are placed along one side of the amplifier with the controls on top, concealed beneath a removable protective cover.

All RD models are equipped with studio-grade signal processing and automatic turn-on capabilities (via signal sensing and DC-offset sensing), for maximum flexibility. Differential-balanced inputs are also on-hand to combat noise and maximize compatibility with a wide range of signal types. Two additional features have been included to simplify installation and set-up: LED clipping indicators to streamline the input level setting process, and "Input Type" switches on the stereo channel sections, eliminating the need for Y-adaptors when bridging.

The look is amazing, and the performance backs it up.

4-Channel Class D Full-Range Amplifier, 100 W x 4 @ 2 Ω / 75 W x 4 @ 4 Ω - 14.4V

Utilizing our exclusive NexD™ high-speed switching technologies, the ultra-compact RD400/4 amplifier is engineered to deliver loads of audio output power, with incredible efficiency and low distortion. Don’t let its modern styling and small size fool you though, this little powerhouse churns out 100 watts of crystal-clear audio from each of its four channels into 2 ohms (14.4V, 1% THD) and is fully bridgeable, so it can be used as a 3-channel amplifier, or as a 2-channel amplifier producing a whopping 200W x 2 into 4 ohms.

For your convenience, the RD400/4’s controls can be found on top of the amplifier, beneath a protective cover, with all connections located along one side of its chassis. Studio-grade signal processing features include high or low-pass 12 dB / octave filters (defeatable) for each channel pair, with continuously variable frequency selection from 50-500 Hz, and dual-range, differential-balanced inputs capable of accepting most input voltage levels. Automatic turn-on capability (via signal sensing or DC-offset sensing) is standard equipment, along with all-new input type switches for bridging of stereo output channels without needing to use Y-adaptors.

Onboard LED-clipping indicators are also included with your RD400/4. This all-new, innovative feature lets you easily set your amplifier’s input sensitivity settings, quickly and accurately, with no special equipment needed. You’ll also find a set of preamp outputs on-hand, so you can pass signals to another amplifier, almost effortlessly. The RD400/4 features a durable, black powder-coated finish and a top-mounted, dual-color LED light strip that reports the overall status and condition.

TECHNICAL DATA:

RMS Power @ 14.4V75W x 4 @ 4Ω. 100W x 4 @ 2Ω. 200W x 2 @ 4Ω Bridged
Output Channels 4
Voltage12v
Class D
Features NexD Switching
Differential Balanced Inputs
Fuse Rating 40A
Cable Gauge 4awg
Amp Turn-On Signal Sensing
DC Offset
12V
Frequency Response 12-22kHz
Signal-to-Noise Ratio 104dB
Filter High-Pass
Low-Pass
Controller N/A
Input Channels 2 / 4
Input Type High Level / Low Level
Input Sensitivity Low Level 200mV-2V
Input Sensitivity High Level 800mV-8V
Height 5.4cm
Width 24.8cm
Depth 17.7cm