Rockford Fosgate R2-500X4 Prime 4 Channel Class D Amplifier 4 x 75w RMS
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The Rockford Fosgate R2-500X4 is a 4-channel full-range Class-D amplifier from the Prime range, rated at 75W x 4 RMS at 4 ohms, 125W x 4 at 2 ohms, or 250W x 2 bridged at 4 ohms — suitable for powering front and rear speakers from a single compact unit.
Key specifications
- Model: R2-500X4
- Channels: 4, full-range Class-D
- Rated power: 75W x 4 at 4 ohms, 125W x 4 at 2 ohms
- Bridged power: 250W x 2 at 4 ohms
- Frequency response: 20Hz – 20kHz
- Crossovers: front and rear high-pass / low-pass, 50Hz – 250Hz, 12dB/octave
- Inputs: RCA and high-level, 2/4 channel input switch
- Recommended fuse: 80A (not included)
- Dimensions (H x W x D): 49mm x 173mm x 255mm
Prime 500 Watt 4-Channel Amplifier
The R2-500X4 is a 500W full-range Class-D amplifier capable of operating at 4Ω or 2Ω stereo and 4Ω bridged/mono. Class-D technology keeps efficiency high and reduces demand on the vehicle's electrical system. It includes C.L.E.A.N. circuitry to help dial in gain settings correctly, and a P.O.W.E.R. supply that increases output as voltage rises.
Key features
- Full-range Class-D design
- CEA-2006 compliant and CE compliant
- Cast aluminium heat sink
- C.L.E.A.N. gain set-up circuitry
- Balanced differential inputs with RCA pass-through outputs
- Front and rear variable input gain adjustment
- Auto-sense bypass switch for vehicles with RAP (Retained Accessory Power)
- Top-mounted control panel
- Short circuit and over-current protection
- Rollback protection
- Fully adjustable 12dB/octave high- and low-pass Butterworth crossovers
- 2/4 channel input selection switch
- High-level input capable
- 1-year warranty
Explore the full range in Rockford Fosgate.
Specification
| Input SensitivityLow-Level | 150 mV - 4 V |
|---|---|
| High-Level | 450 mV - 12 V |
| Total Harmonic Distortion (THD+Noise)4Ω | <1.0% |
| 2Ω | <1.0% |
| Signal InputFront Low-Level | 4 RCA |
| Front High-Level | 4-Pin Molex |
| Rear Low-Level | 4 RCA |
| Rear High-Level | 4-Pin Molex |
| Input Switch | 2/4 Input(works for RCA/hi-level inputs) |
| Signal OutputLow-Level | 2 RCA(Pass-Thru active with RCA or Hi-Level input) |
| Crossover ControlsFront High-Pass | 50 Hz - 250 Hz @ 12dB/Octave Butterworth |
| Front Low-Pass | 50 Hz - 250 Hz @ 12dB/Octave Butterworth |
| Rear High-Pass | 50 Hz - 250 Hz @ 12dB/Octave Butterworth |
| Rear Low-Pass | 50 Hz - 250 Hz @ 12dB/Octave Butterworth |
| All-Pass | Yes |
| Dimensions | (H x W x D)1.9" x 6.8" x 10.1"(4.9 cm x 17.3 cm x 25.5 cm) |
More specs
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What's Included
- R2-500X4
Rockford Fosgate
About the Rockford Fosgate R2-500X4
From our tech experts at CEN
A 4-channel amplifier from Rockford Fosgate, Class D, rated at 75w RMS.
Who it suits
Drivers whose speakers have outgrown the head unit. Rockford Fosgate has been a fixture of car audio since the 1970s, and the Punch name still means solid, honest output.
Our tech experts advise
Matching matters more than headline watts, and gains want setting with a meter rather than by ear. It needs a fused feed from the battery on the correct cable gauge. Installation is priced per vehicle, so get in touch with your make, model and year and we will confirm what it needs. See car audio installation.
Explore the full Rockford Fosgate range at CEN, with fast UK dispatch and expert advice from our Nottingham team. Shop all Rockford Fosgate
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Frequently Asked Questions
Q: How do I choose the right amplifier for my speakers or subwoofer?
A: Match the amplifier's RMS output per channel to the RMS handling of your speakers or subwoofer at the same impedance. The Specification tab lists the power figures. If in doubt, contact CEN with your setup and we will recommend a match.
Q: What wiring do I need to install this amplifier?
A: You will need an amplifier wiring kit sized to the amplifier's power draw, typically including power and earth cable, a fuse, RCA leads and a remote wire. CEN stocks complete wiring kits, and the amplifier's fuse rating is the guide to the cable gauge required.
Q: What class of amplifier is this and does it matter?
A: Class D amplifiers are compact and efficient, ideal for subwoofers and modern installs. Class AB designs are traditionally favoured for outright sound quality on mid and high frequencies. The class is listed in the Specification tab where provided.
Q: Will an amplifier work with my factory head unit?
A: Yes, in most cases. If your head unit has no RCA outputs you will need a line output converter to feed the amplifier a clean signal. CEN stocks line output converters and can advise the right one for your vehicle.
Q: Can CEN install this amplifier?
A: Yes. CEN offers professional amplifier installation from our Nottingham premises, including secure mounting, wiring and setup. Contact us to book.
Q: How much power does the R2-500X4 produce?
A: The R2-500X4 is rated at 75W RMS x 4 at 4 ohms, 125W RMS x 4 at 2 ohms, and 250W RMS x 2 at 4 ohms when bridged.
Q: Can I run four speakers from two RCA outputs with the R2-500X4?
A: Yes. The 2/4 channel input selection switch lets the amplifier drive all four channels from a two-channel RCA or high-level input.
Q: Does the R2-500X4 include a remote level control?
A: No. The R2-500X4 does not have remote controls; gain and crossovers are set on the top-mounted control panel.
