Art:

• RD 400W 4-channel full range amplifier in Class D
• The top seller of 4-channel amplifiers at JL Audio!

Test result:

• Test in Car & Hifi 2/2017 - top class - grade 1.4 - purchase value: very good

Features:

• 4-channel full-range amplifier Class D, 100 W x 4 @ 2 Ω / 75 W x 4 @ 4 Ω - 14.4V
  
• Using JL's exclusive NexD™ high-speed switching technologies, the ultra-compact RD400/4 amplifier is designed to deliver high audio output power with incredible efficiency and low distortion.
  
• The RD400/4's controls are on the top of the amplifier under a protective cover, with all connections located on one side of the chassis.
• Studio-quality signal processing features include high-pass or low-pass filters with 12 dB/octave (disengageable) for each pair of channels with continuous frequency selection from 50 to 500 Hz and differential balanced
• An automatic power-on function (via signal sampling or DC offset sampling) is standard, along with all-new input switches for bridging stereo output channels without the need for Y-adapters.
  
• Integrated LED clipping indicators are also included with the RD400/4. This all-new, innovative feature allows you to quickly and precisely adjust the amplifier's input sensitivity settings without the need for special equipment.
• A set of preamplifier outputs is also available, so that one can effortlessly route the signals to another amplifier.
• The RD400/4 features a durable black powder-coated finish and a top-mounted, two-color LED light bar that indicates overall status and condition.

Rated continuous power (RMS) at 14.4 V:

• @ 4 Ω : 75 W RMS x 4
• @ 2 Ω : 100 W RMS x 4
• Bridged @ 4Ω : 200 W RMS x 2

Rated continuous power (RMS) at 12.5 V:

• @ 4 Ω : 60 W RMS x 4
• @ 2 Ω : 90 W RMS x 4
• Bridged @ 4Ω : 180 W RMS x 2

General Specifications:

• Frequency response : 12 Hz - 22 kHz (+0, -1dB)
  
• S/N ratio, referenced to highest rated power : >104 dB below rated power (A-weighted, 20 Hz - 20 kHz noise bandwidth).
  
• Attenuation factor @ 4 Ω : >150 / 50 Hz
  
• Attenuation factor @ 2 Ω : >75 / 50 Hz
  
• THD+N @ nominal 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)
  
• Minimum cable diameter : 25mm²
  Fuse rating : 40A (AFS, AGU or MaxiFuse™)

Signal processing:

• Filter mode : Low-pass or high-pass
  
• Filter slope : 12 dB/octave
  
• Filter frequency range : 50 Hz - 500 Hz
• Filter defeat function : Yes
  
• Remote control : No
• Channel input mode switch : Yes (2/4 channel)
  
• Pass-through preamp output : buffered
  
• Source channel selection for PreOuts : No

Physical specifications:

• Height (H): 54 mm (2.13 in.)
  
• Width (W): 248 mm (9.78 inch)
  
• Depth (D) : 6.96 inch / 177 mm