Memphis PRX500.4V2 4-Channel Car Amplifier

The Memphis PRX500.4V2 is a four-channel car audio amplifier designed to add clean, controllable power to factory-replacement or aftermarket speaker systems. It delivers 75 watts RMS to each channel at 4 ohms or 125 watts RMS to each channel at 2 ohms. This makes it a practical choice for powering front and rear speakers from a compact amplifier chassis.

For systems that need more flexibility, the amplifier can also be bridged to produce 250 watts RMS across each of two 4-ohm channels. That arrangement can support a pair of higher-power speakers or a mixed system using speakers on one channel pair and compatible subwoofers on the other. Minimum supported loads are 2 ohms per channel in stereo operation and 4 ohms when bridged.

The PRX500.4V2 is built for users who want more output and tuning control than a head unit amplifier typically provides. Its frequency response extends from 10 Hz to 27 kHz, while adjustable high-pass and low-pass crossovers help direct the appropriate frequency range to each speaker. A variable EQ boost provides up to 12 dB of adjustment centered at 45 Hz.

Connection flexibility helps the amplifier fit a wide range of vehicle audio systems. It accepts both preamp-level and speaker-level signals, allowing installation with many aftermarket radios as well as factory systems. A selectable 2-channel or 4-channel input mode can simplify signal routing when the source unit has limited outputs.

The Power Reference design combines a compact footprint with accessible setup controls. Its top-mounted controls sit beneath a removable panel, while blue LED lighting accents the top cover and under-mount area. The PRX500.4V2 is well suited to a speaker-focused upgrade or as part of a system that may later expand through its RCA preamp outputs.

Key Features

• Four-Channel RMS Power: Supplies 75W x 4 at 4 ohms or 125W x 4 at 2 ohms.
• Bridgeable Channel Pairs: Delivers 250W x 2 at 4 ohms when configured in bridged mode.
• Adjustable Crossovers: High-pass and low-pass filters help match output to speaker duties.
• High- and Low-Level Inputs: Supports RCA preamp signals and factory-radio speaker-level signals.
• Selectable Turn-On Modes: Supports remote, DC-offset, and audio-sensing turn-on options.
• LED-Accented Compact Chassis: Combines an extruded aluminum heatsink with concealed top controls.

Design & Installation

The PRX500.4V2 uses an extruded aluminum heatsink chassis with blue LED top-cover and under-mount lighting accents. A removable top panel conceals the adjustment controls for a cleaner installed appearance while retaining access for system tuning. Protection circuitry is specified for overload, short circuit, thermal, and reverse-polarity conditions.

Mount the amplifier in a dry, ventilated location and verify speaker impedance before connecting outputs. Memphis specifies its 8GKIT as the recommended amplifier kit, and the manual requires a minimum 2-ohm stereo load or 4-ohm bridged load. Use RCA inputs for aftermarket source units, or the included speaker-wire-to-RCA adapters when integrating speaker-level outputs.