Features
Controls
Connections

Features

Overview: The Rockford Fosgate Prime R2-500X4 is a 4-channel full-range Class D amplifier. It's effectively two full range 2-channel amps built into one chassis, labeled Front and Rear. Each section of the amp is bridgeable, so it can be wired as 4-channel, 3-channel, or 2-channel.

CEA-2006 Compliant: CEA-2006 is a system of testing and measurement for mobile audio amplifiers. This voluntary standard advocates a uniform method for measuring an amplifier's RMS power output and signal-to-noise ratio. The criteria for measuring amplifier power uses a DC input voltage of 14.4 volts and the RMS power output is measured over a frequency range of 20 Hz to 20 kHz (for full range amplifiers), with 1% or less Total Harmonic Distortion plus noise (THD+N). Signal-to-Noise ratio is measured in weighted absolute decibels (dBA) at a reference of 1 watt into 4 ohms. CEA-2006 standards allow consumers to compare car amplifiers and receivers under the same conditions (apples to apples).

CEA-2006 Specifications:

• Power Output: 75 watts RMS x 4 into 4Ω
• Signal to Noise Ratio: >80 dBA (measured at 1 watt into 4Ω)

Other Specifications:

• Power Output:
  • 2Ω: 125 watts RMS x 4 (14.4 volts)
  • Bridged: 250 watts RMS x 2 (14.4 volts, 4Ω)

Mounting: The amplifier can be mounted vertically, horizontally, or inverted using the supplied mounting screws; horizontal mounting (right side up) will provide the best cooling.

Controls

Input Switch: Set this switch to match the number of inputs used, 2-channel or 4-channel. In 2-channel mode the signal on the front input feeds all four output channels.

Independent Controls: The R2-500X4 has independent, top-mounted controls for the front and rear channels:

• Gain: rotary gain controls; labeled 0 to 11 (equivalent to 150mV-4V line level or 450mV-12V speaker level)
• Crossover: 3-position switch; choose low-pass, all-pass, or high-pass; low-pass and high-pass crossovers are 12 dB per octave Butterworth
• Frequency: rotary dials; continuously variable from 50-250 Hz

Auto Turn-on Switch: When using speaker level inputs, this switch can be set to On and the amp will turn on when it senses an input signal (DC offset on the left front input). When using the RCA inputs a remote turn-on wire must be connected.

Connections

Power Terminals: The power and ground terminals are nickel-plated set-screw terminals, and will accommodate up to 4-gauge wire. (Rockford Fosgate recommends using 4-gauge power and ground wire.) The set screws are tightened/loosened with the included 3mm hex key.

Fuses: The amplifier does not have on-board fuses. An 80-amp fuse should be placed on the power wire within 18" of the battery.

Remote Turn-On Terminal: The remote turn-on terminal is a nickel-plated set-screw terminal that will accommodate up to 8-gauge wire. The set screw is tightened/loosened with the included 3mm hex key.

Speaker Terminals: The speaker terminals are nickel-plated set-screw terminals that will accommodate up to 8-gauge wire. The set screws are tightened/loosened with the included 3mm hex key.

RCA Input Jacks: There are two pair of RCA input jacks for the front and rear channels. The balanced differential inputs are nickel-plated to resist signal degradation caused by corrosion.

RCA Pass-Thru Jacks: One pair of nickel-plated RCA pass-thru jacks provide a convenient way to connect an additional amplifier without running an extra set of RCA cables from the front of the vehicle to the amplifier location. The signal from the front RCA inputs is passed to the RCA outputs.

Speaker Level Inputs: There are ports for the two included speaker input harnesses, front and rear. If speaker level inputs are used, nothing should be connected to the RCA jacks.