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The Infinity REF475A is a 4-channel full-range amplifier featuring a built-in 12dB per octave electronic crossover.

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The Infinity REF475A is a 4-channel full-range amplifier featuring a built-in 12dB per octave electronic crossover to optimize bass performance.  The amplifier utilizes a high-output PWM MOSFET power supply for better power delivery leading to low distortion.  It provides 75 watts of RMS power per channel at 4 Ohms and 117 watts of power per channel at 2 Ohms and has a variable bass boost of 0dB to 6dB at 50 Hz.  The REF475A also includes full-range preamp outputs allowing multiple amplifiers to be used without the need for an adapter and RCA low-level inputs allowing connection to a preamp level signal and head unit.

Specifications
  • 4-channel full-range amplifier
  • High-output PWM MOSFET power supply
  • Built-in variable bass boost circuit
  • One pair of full-range preamp outputs
  • 12dB per octave on-board electronic crossover
  • RCA low-level inputs
  • Power Output: 75 watts RMS x 4 channel at 4 ohms and ≤ 1% THD + N 180 watts RMS x 2 channel at 4 ohms, 14.4V supply and ≤ 1% THD + N
  • Signal-to-Noise Ratio: 85dBA (reference 1 watt into 4 ohms)
  • Dynamic Power: 117 watts at 2 ohms
  • Effective Damping Factor: 6.3 at 4 ohms
  • Frequency Response: 10Hz to 100Hz (-3dB)
  • Maximum Input Signal: 6V
  • Maximum Sensitivity: 100mV
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