Shop all ROCKFORD FOSGATE
Rockford Fosgate R2-300X4 4-Channel Class-D Amplifier
- 50W RMS x 4 at 4Ω
- 75W RMS x 4 at 2Ω
- Bridgeable to 150W x 2
- Variable 50–250 Hz crossovers
- High-level and RCA inputs
Dealer pricing
Sign in to see your tier price and build a quote.
Product Info
| Brand | ROCKFORD FOSGATE |
|---|---|
| Model / SKU | R2-300X4 |
| UPC | 780687355821 |
| Availability | In stock and ready to quote |
The Rockford Fosgate Prime R2-300X4 is a full-range, four-channel Class-D amplifier for upgrading factory or aftermarket vehicle audio systems. It provides dedicated amplification for front and rear speakers, helping a system play with greater control and output than a head unit’s built-in amplifier. With 300 watts of total rated RMS power, it is designed for compact multi-speaker installations.
This amplifier is well suited to drivers replacing factory door speakers or building a balanced front-and-rear speaker system. It delivers 50 watts RMS to each of four channels at 4 ohms, or 75 watts RMS per channel at 2 ohms. Each front/rear channel pair can also be bridged for higher-power two-channel configurations using compatible 4-ohm loads.
Class-D topology helps reduce electrical demand while keeping the amplifier compact. The R2-300X4 has a 20 Hz to 20 kHz frequency response for full-range speaker use, making it appropriate for component speakers, coaxials, and other midrange/high-frequency applications. Adjustable front and rear crossovers allow the system to be configured around the speakers and any separate subwoofer system.
Rockford Fosgate C.L.E.A.N. circuitry uses input and output clip indicators to assist with gain setup. Balanced differential inputs, high-level input capability, and a 2/4-channel input switch support integration with a variety of factory and aftermarket source units. RCA pass-through outputs can feed an additional amplifier when expanding the system.
The R2-300X4 is built for practical system upgrades rather than requiring a complex signal chain. Its selectable Punch EQ, variable gain controls, and top-mounted adjustment panel make it easier to fine-tune a four-speaker installation. A compact chassis and convection cooling support installation in many vehicle locations with suitable ventilation.
Key Features
- Four-Channel Class-D Power: Delivers 50 watts RMS per channel at 4 ohms.
- Bridgeable Channel Pairs: Supports 150 watts RMS x 2 at 4 ohms bridged.
- C.L.E.A.N. Setup: Clip indicators help set amplifier gain levels accurately.
- Variable Crossovers: Front and rear HPF, LPF, or all-pass settings aid system tuning.
- Flexible Inputs: Accepts low-level RCA or high-level speaker signals.
- RCA Pass-Through: Provides outputs for adding another amplifier.
Design & Installation
The R2-300X4 uses a cast-aluminum heat sink with convection cooling and a compact 1.9-inch-high chassis. Its compression terminal blocks provide secure power and speaker connections, while the top-mounted controls keep setup adjustments accessible after installation. Power, protect, and C.L.E.A.N. status indicators provide visual operating feedback.
Use 4 AWG power and ground wiring with a properly installed 60-amp fuse, and use suitable speaker wire up to 8 AWG. The amplifier accepts RCA preamp signals or high-level speaker signals, making it suitable for many factory-radio and aftermarket-radio installations. Mount it securely in a ventilated location, and configure its front and rear crossover sections to match the speakers and overall system design.
| Model | R2-300X4 |
|---|---|
| UPC | 780687355821 |
| Amplifier Type | Full-range 4-channel car amplifier |
| Circuit Topology | Class-D |
| Number of Channels | 4 |
| CTA-2006 Compliance | Yes |
| Total Rated Power | 300 watts |
| CTA-2006 Power Rating | 50 watts x 4 at 4 ohms, ≤1.0% THD+N |
| RMS Power at 4 Ohms | 50 watts x 4 |
| RMS Power at 2 Ohms | 75 watts x 4 |
| RMS Bridged Power at 4 Ohms | 150 watts x 2 |
| Dynamic Power at 4 Ohms | 70 watts x 4 |
| Dynamic Power at 2 Ohms | 115 watts x 4 |
| Dynamic Bridged Power at 4 Ohms | 230 watts x 2 |
| Bridgeable | Yes |
| Minimum Stereo Impedance | 2 ohms per channel |
| Minimum Bridged Impedance | 4 ohms |
| Frequency Response | 20 Hz–20 kHz |
| Low-Level Input Sensitivity | 150 mV–4 V |
| High-Level Input Sensitivity | 450 mV–12 V |
| Total Harmonic Distortion at 4 Ohms | <1.0% |
| Total Harmonic Distortion at 2 Ohms | <1.0% |
| Signal-to-Noise Ratio | >70 dB, CEA-2006 |
| Front Low-Level Input | 4 RCA |
| Front High-Level Input | 4-pin Molex |
| Rear Low-Level Input | 4 RCA |
| Rear High-Level Input | 4-pin Molex |
| Input Mode Switch | 2/4-channel, compatible with RCA or high-level inputs |
| Signal Output | 2 RCA low-level pass-through outputs |
| Pass-Through Operation | Active with RCA or high-level input |
| Front High-Pass Crossover | 50–250 Hz, 12 dB/octave Butterworth |
| Front Low-Pass Crossover | 50–250 Hz, 12 dB/octave Butterworth |
| Rear High-Pass Crossover | 50–250 Hz, 12 dB/octave Butterworth |
| Rear Low-Pass Crossover | 50–250 Hz, 12 dB/octave Butterworth |
| All-Pass Crossover Mode | Yes |
| Crossover Slope | 12 dB/octave |
| Punch EQ | Selectable 0/6/12 dB at 45 Hz |
| C.L.E.A.N. Technology | Input and front/rear output clip indicators |
| Visual Indicators | Power/Protect, C.L.E.A.N. In, C.L.E.A.N. Out front, C.L.E.A.N. Out rear |
| Gain Controls | Separate front and rear variable input gain adjustment |
| Auto Turn-On | Defeatable automatic turn-on circuit |
| Input Design | Balanced differential inputs |
| Control Location | Top-mounted control panel |
| Protection | Short-circuit and over-current protection |
| Heatsink Material | Cast aluminum |
| Cooling Method | Convection |
| Operating Voltage | 9–16 VDC |
| Recommended Fuse | 60 A, not included |
| Maximum Current Draw | 39 A at 13.8 V sinewave |
| Recommended Power Wire | 4 AWG |
| Power Input Connector | Compression terminal block |
| Supported Speaker Wire | Up to 8 AWG |
| Speaker Output Connector | Compression terminal block |
| Height | 1.9 in. (4.9 cm) |
| Width | 6.8 in. (17.3 cm) |
| Depth | 10.1 in. (25.5 cm) |
| Included Speaker Input Harnesses | 2 |
| Included Mounting Screws | 4 |
| Included Flat Washers | 4 |
| Included Tool | 3 mm Allen hex key |
| Warranty | 1 year |
Can this amplifier power four door speakers?
Yes. It is a four-channel full-range amplifier rated at 50 watts RMS x 4 at 4 ohms or 75 watts RMS x 4 at 2 ohms. Match its power and impedance capability to the speakers being used.
Can I bridge the R2-300X4?
Yes. Its front and rear channel pairs are bridgeable, producing 150 watts RMS x 2 into 4-ohm bridged loads. Do not use a lower-than-4-ohm load when a channel pair is bridged.
Will it work with a factory radio?
Yes. It has high-level inputs and a defeatable automatic turn-on circuit for integration with compatible factory systems. It also accepts low-level RCA inputs from an aftermarket receiver.
What wiring is needed for installation?
A 4 AWG power and ground wiring setup is recommended, along with a 60-amp fuse that is not included. Speaker wiring, signal wiring, and installation hardware should be selected for the vehicle and system layout.
What is included with the amplifier?
The package includes the amplifier, two speaker-input harnesses, a 3 mm Allen hex key, four mounting screws, four flat washers, an installation manual, and a performance certificate. Power wiring, ground wiring, and the required fuse are not included.
What warranty does it have?
The R2-300X4 carries a one-year manufacturer warranty. Warranty coverage is subject to Rockford Fosgate terms and proof-of-purchase requirements.
Contact Us for Pricing
Thank you! We'll get back to you shortly.
Please fill in all required fields.
Frequently bought together
You may also like
