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JL AUDIO RD400/4
JL AUDIO RD400/4
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.
RD400/4 Specifications
Amplifier Section:
Amplifier Topology: NexD™ Ultra-High Speed Class D
Power Supply: Unregulated MOSFET switching type
Rated Power at 14.4V with less than
1% THD+Noise (20 Hz - 20 kHz) RMS Method
Stereo, all channels driven:
75W RMS x 4 @ 4 ohms, 100W RMS x 4 @ 2 ohms
Bridged, all channels driven:
150W RMS x 2 @ 8 ohms, 200W RMS x 2 @ 4 ohms
Rated Power @ 12.5V with less than
1% THD + Noise (20 Hz - 20 kHz) RMS Method
Stereo, all channels driven:
60W RMS x 4 @ 4 ohms, 90W RMS x 4 @ 2 ohms
Rated Power Bridged, all channels driven:
120W RMS x 2 @ 8 ohms, 180W RMS x 2 @ 4 ohms
Signal to Noise Ratio:
>104 dB referred to rated power
(A-weighted, 20 Hz-20 kHz noise bandwidth)
>84 dB referred to 1W
(A-weighted, 20 Hz-20 kHz noise bandwidth)
Frequency Response: 12 Hz - 22 kHz (+0, -1 dB)
Damping Factor:
>150 @ 4 ohms per ch./ 50 Hz
>75 @ 2 ohms per ch. / 50 Hz
Input Section:
No. of Inputs: Two Stereo Pairs
Input Type: Differential-balanced with RCA jack inputs
Input Range: 200mV - 8V RMS
Signal Processing:
Filter Type: State-variable, 12 dB/octave Butterworth
with continuously variable cutoff frequency selection
from 50 - 500 Hz.
Configurable as Low-Pass or High-Pass. Defeatable.
Preamp Output: Buffered pass-through type.
Power Connections:
Recommended Fuse Value: 40A
Minimum Copper Power/Ground Wire : 4 AWG
(Note: Copper Clad Aluminum (CCA) wire is
not recommended.)
Dimensions (LxWxH):
9.78" x 6.96" x 2.13" (248 mm x 177 mm x 54 mm)