Rockford Fosgate R2-250X1 250W Class-D Mono Amplifier

The Rockford Fosgate Prime R2-250X1 is a compact mono amplifier designed to add dedicated subwoofer power to a car audio system. It delivers 150 watts RMS at 4 ohms or 250 watts RMS at 2 ohms, making it suited to modest single-subwoofer systems and compatible multi-subwoofer loads. Its mono configuration focuses its output on low-frequency reinforcement rather than full-range speaker amplification.

This amplifier is a practical choice for listeners who want more controlled bass than a factory radio can provide. Its Class-D design is intended to use electrical power efficiently while keeping the chassis compact. The R2-250X1 is designed for use with subwoofers and includes low-pass and infrasonic filtering controls for system tuning.

A variable low-pass crossover lets you set the upper bass range sent to the subwoofer, while the infrasonic filter reduces very low frequencies below the selected point. These controls can help integrate the subwoofer with door speakers and can be particularly useful with ported enclosures. Variable Punch EQ provides up to 18 dB of boost at 45 Hz, so it should be adjusted carefully after gain setup.

The R2-250X1 supports both RCA low-level inputs and speaker-level inputs, allowing installation with many aftermarket or factory audio systems. Its high-level input capability can connect directly to compatible OEM speaker wiring without a separate line output converter. Auto remote turn-on is available when using high-level inputs, while a conventional remote-turn-on connection remains available for other installations.

Rockford Fosgate C.L.E.A.N. input and output indicators assist with setting source volume and amplifier gain before audible clipping becomes a problem. A wired remote level control is included for adjusting subwoofer output from the front of the vehicle. Preamp pass-through outputs also provide a signal path for adding another amplifier later.

Key Features

• Mono Class-D Output: Delivers dedicated power for a compatible subwoofer load.
• 250W RMS at 2 Ohms: Provides higher output with a 2-ohm load.
• Variable Low-Pass Filter: Helps blend subwoofer output with full-range speakers.
• Infrasonic Filter: Reduces ultra-low frequencies below the selected setting.
• C.L.E.A.N. Indicators: Helps set source level and amplifier gain.
• Remote Level Control: Lets you adjust bass output from the cabin.

Design & Installation

The R2-250X1 uses a compact chassis with a 1.9-inch height and nickel-plated set-screw terminals. Power and ground terminals accept up to 4 AWG wire, while remote and speaker terminals accept up to 8 AWG wire. Blue power and red protect/thermal indicators provide basic operating-status feedback, and the amplifier mutes automatically during overheating or a short-circuit condition.

Use one positive and one negative speaker terminal for a subwoofer connection; the paired output terminals are wired internally in parallel for installation flexibility. The amplifier is rated for 150 watts RMS at 4 ohms or 250 watts RMS at 2 ohms, and it is not recommended for loads below 2 ohms. Allow at least 1 inch of air space around the heat sink, mount it outside the engine compartment, and install the required external fuse within 18 inches of the battery connection.