R300X4 Prime 300 Watt 4-Channel Amplifier

The PRIME R300X4 is a versatile 4-channel amplifier capable of running your entire system. The R300X4 is great for full-range or component speakers on the front channels with subwoofers on the rear running in bridged/mono mode.

  • 12dB/octave Butterworth crossover
  • 0/6/12 dB On Board Punch EQ Control
  • 2/4 channel input switch
  • High Level Input (4-pin)
  • Separate Front and Rear Gain Control
  • Real time output and power supply thermal sensing
  • Cast aluminum heatsink
  • 4 Gauge power/ground connectors
  • MOSFET power supply
  • Over current protection
  • Short circuit protection
  • Muted turn on
  • 1 Year Standard Warranty warranty info
Class-AB

R300X4

Rockford Fosgate amplification at an unbelievable value. The R300X4 4-channel amplifier is so versatile, it will be the only amplifier your system needs. Full-range or component speakers on the front channels and a single R1S410 10" or R1S412 12" woofer bridged/mono on the rear. Consider your system clean, loud and done!. Check out our RFTECH:Woofer WiringWizard to get the most out of your amplifier.


CEA-2006 Compliant

CEA-2006 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These...
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CE Compliant

CE Compliant

This product fulfills all essential safety and environmental requirements as defined in the...
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Class-AB

Class-AB

An amplifier topology with the best of both worlds; a Class A preamp and Class B output stage.
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CEA-2006 Compliant: CEA-2006 Power Rating
50W x 4 @ 4Ω
≤1.0% THD+N
Number of Channels: 4
Rated Power
(RMS Continuous Power):
50 Watts x 4 @ 4-Ohm
75 Watts x 4 @ 2-Ohm
150 Watts x 2 @ 4-Ohm Bridged
Total Power
(Sum of Rated Power):
300 Watts RMS
Dynamic Power
(PVC/PowerCube® Measurement):
76 Watts x 4 @ 4-Ohms 0° Res
100 Watts x 4 @ 2-Ohms 0° Res
Bridgeable: Yes
Frequency Response: 20Hz to 20kHz +/-1dB
Efficiency (average): 69% @ 4-Ohm
Total Harmonic Distortion (THD+Noise): 4-Ohm: <1.0%
2-Ohm: <1.0%
Crossover Controls: Front Channels
High-Pass/Low-Pass (HP/LP): 50-250Hz @ 12dB/octave Butterworth

Rear Channels
High-Pass/Low-Pass (HP/LP): 50-250Hz @ 12dB/octave Butterworth
Tone Controls: Front Channels
Punch Bass: 0dB/+6dB/+12dB @ 45Hz

Rear Channels
Punch Bass: 0dB/+6dB/+12dB @ 45Hz

Function works when crossover in (LP) position
Input Sensitivity: 150 mV - 4 V
Signal Input: Low Level: 2 RCA pair
Signal Output: -
Power Input Connector: Screw terminal
Power Wire Gauge: 4 AWG
Speaker Output Connector: Screw terminal
Speaker Wire Gauge: 8 AWG
Heat Sink Type: Extruded Aluminum
Cooling: Convection
Remote Controls: -
Visual Indicators: Power/Protect LED
Circuit Topology Class: Class-A/B
Operating Voltage: 9 - 16 VDC
Recommended Fuse
(not included):
50 A
Max. Current Draw (13.8V Sinewave): 50 A
Average Current Draw (13.8V Music): 25 A
Suggested Alternator: 75 A
Shipping Weight: 7.8 Lbs. (3.53 Kg.)
Dimensions (HxWxL): 1.98 x 6.77 x 13.19 (in)
5 x 17.2 x 33.5 (cm)
Dimensional Diagram:

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Return Authorization

Contact the Authorized Rockford Fosgate Dealer you purchased this product from. If you need further assistance, call 1-800-669-9899 for Rockford Customer Service. You must obtain an RA# (Return Authorization number) to return any product to Rockford Fosgate. You are responsible for shipment of product to Rockford.

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