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Rockford Fosgate R400-4D 400 Watt 4-Channel Class D Car Amplifier

Rockford Fosgate R400-4D 400 Watt 4-Channel Class D Car Amplifier

Rockford Fosgate R400-4D 400 Watt 4-Channel Class D Car Amplifier

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Rockford Fosgate
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Overall Rating 5 (Based on 1 reviews)

Rockford Fosgate R400-4D Product Highlights

  • 4-Channel 400 Watts car amplifier.
  • LED indicators for power and protect, and provides protection against short circuiting, over loading and thermal overload.
  • Features cast aluminum heatsink for effective heat dissipation and has P.O.W.E.R. operation.
  • Frequency Response of 20Hz to 20KHz +/- 1.0dB and is CEA-2006 compliant.
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Frequently Bought Together


Unit includes: Car Amplifier, Mounting hardware, and Instruction manual

Rockford Fosgate R400-4D 400 Watt 4-Channel Class D Car Amplifier:


  • 400 Watt Prime Series 4-Channel Class D Car Amplifier
  • Top mounted controls
  • LED indicators for Power and Protect
  • Provides three way protection circuitry, which includes thermal, overload and speaker short circuits
  • Revolutionary P.O.W.E.R. system that changes output power with change in voltage
  • Heavy-duty cast aluminum heat sink for utmost heat dissipation
  • Requires minimum 4 gauge power and ground wiring for installation
  • CEA-2006 compliant amplifier
  • Frequency Response: 20Hz to 20KHz +/- 1.0dB

Inputs and Outputs:

  • 4 channel operation
  • Nickel-plated RCA level inputs
  • Nickel-plated RCA level outputs
  • Input sensitivity is 150mV to 4V
  • Block 12 AWG speaker connections
  • Block 4 AWG power connections

Max Power Output:

  • 400 Watts

RMS Power Output:

  • 4-Ohms: 75 Watts x 4
  • 2-Ohms: 100 Watts x 4
  • 4-Ohms: 200 Watts x 2 (Bridged)

Built in Crossover:

  • Front variable: 50 Hz - 500 Hz @ 12 dB/octave
  • Rear variable: 50 Hz - 500 Hz @ 12 dB/octave


  • Overall Dimensions: 1.97” (H) x 6.77” (D) x 9.10” (W)

Technical Specifications

Manufacturer Rockford Fosgate
Part Number R400-4D
Amplifier Topology Class Class D
Number of Channels 4 Channel
Total Peak Power Output No
Total RMS Power Output 400 watts
Total RMS Power at 1 ohm 0Watts
Total RMS Power at 2 ohm 0Watts
Total RMS Power at 4 ohm 0Watts
Total Peak Power Output 0Watts
Amplifier Bridging Bridgable @ 4 ohms
Minimum Impedance in Bridged Mode 4 ohm
Minimum Impedance in Un-Bridged Mode 2 ohm
Strappable Amplifier No
Strappable Power Output No
RCA Pre-amp Audio inputs No
RCA Pre-amp Audio outputs 1 Pair
Preamp voltage No
Speaker level inputs Yes
Gain Control No
Bass Knob / Remote Gain Optional
Built in Crossover High-pass, Low-pass
Cooling Fan No
Color Black
Warranty 1 Year
Recommended Power Wire Gauge 8 Gauge
UPC Code 780687333119

Customer Reviews

Great amp
Review by
Install (5 star for easy)
Dope amp, works and sounds great, glad I spent the money on a quality name. (Posted on 4/4/2017)

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Rockford Fosgate
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Your Price: $199.99
$0.00 Tax Outside CA
Item sku:R400-4D
Availability: Back-Ordered
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