ROCKFORD FOSGATE 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.

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.

CEA-2006 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's ...

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CEA-2006 Compliant

Power ratings on Rockford Fosgate amplifiers conform to CEA-2006 industry standards. These guidelines mean your amplifier's output power ratings are REAL POWER numbers, not inflated marketing ratings.

Class A/B

An amplifier topology with the best of both worlds; a Class A preamp and Class B ...

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Class A/B

An amplifier topology with the best of both worlds; a Class A preamp and Class B output stage.

CE Compliant

This product fulfills all essential safety and environmental requirements as defined in the European Directives (768/2008 ...

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CEA-2006 Compliant

CEA-2006 Power Rating
50W x 4 @ 4Ω
≤1.0% THD+N

Number of Channels

4

Total Power 
(Sum of Rated Power)

300 Watts RMS

Rated Power 
(RMS Continuous Power)

50 Watts x 4 @ 4-Ohm 
75 Watts x 4 @ 2-Ohm 
150 Watts x 2 @ 4-Ohm Bridged

Dynamic Power 
(PVC/PowerCube®)

76 Watts x 4 @ 4-Ohms 0° Res 
100 Watts x 4 @ 2-Ohms 0° Res

Bridgeable

Yes

Frequency Response

20Hz to 20kHz +/-1dB

Input Sensitivity

150 mV - 4 V

Circuit Topology Class

Class A/B

Efficiency (average)

69% @ 4-Ohm

Total Harmonic Distortion (THD+Noise)

4-Ohm: <1.0% 
2-Ohm: <1.0%

Signal Input

High Level: 4-pin MOLEX 
Low Level: 2 RCA pair

Signal Output

-

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

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

Remote Controls

-

Visual Indicators

Power/Protect LED

Power Wire Gauge

4 AWG

Power Input Connector

Screw terminal

Speaker Wire Gauge

8 AWG

Speaker Output Connector

Screw terminal

Cooling

Convection

Heatsink

Operating Voltage

9 - 16 VDC

Recommended Fuse 
(not included)

50 A

Average Current Draw (13.8V Music)

25 A

Max. Current Draw (13.8V Sinewave)

50 A

Suggested Alternator

75 A

Dimensional Diagram

Dimensions (H x W x D)

1.98 x 6.77 x 13.19 (in) 
5 x 17.2 x 33.5 (cm)

Shipping Weight

7.8 Lbs. (3.53 Kg.)