Alpine R2-A75M 750W Mono Sub Amp

Type: Class D mono subwoofer amplifier
Power Output (CTA-2006 Compliant):
- 500 watts RMS × 1 at 4 ohms
- 750 watts RMS × 1 at 2 ohms
Frequency Response: 10-400 Hz
Signal-to-Noise Ratio: 75 dBA (reference: 1 watt into 4 ohms)

Premium Components: High-efficiency transformers and custom capacitors for superior sound
Subwoofer Optimization:
- Variable low-pass filter (50-400 Hz, 24 dB/octave)
- Variable subsonic filter (8-40 Hz, 24 dB/octave)
- Adjustable bass boost (0-12 dB at 50 Hz)
Versatile Inputs: Both preamp and speaker-level inputs (up to 10V)
Simplified Installation: Parallel speaker output terminals for easy connection of multiple subwoofers
Remote Control Ready: Optional RUX-KNOB.2 wired remote bass level control
System Expansion: Preamp outputs for connecting additional amplifiers

RMS Power Output (CTA-2006 Compliant):
- 500 watts × 1 at 4 ohms
- 750 watts × 1 at 2 ohms
Frequency Response: 10-400 Hz
Signal-to-Noise Ratio:
- 75 dBA (at 1 watt into 4Ω)
- 102 dB (at rated power output, 4Ω)
Total Harmonic Distortion: ≤1% at rated power
Minimum Impedance: 2 ohms
Input Voltage: 14.4V

Dimensions:
- Width: 11-1/8 inches (11.12″)
- Height: 2-1/4 inches (2.23″)
- Depth: 6-15/16 inches (6.91″)
Fuse Rating: 40A × 2
Recommended Power/Ground Wire: 4-gauge

Amplifier Class: Class D (high efficiency design)
Built-in DSP: No
Cooling: No fan (passive cooling)
Construction: Premium components including:
- High-efficiency transformers
- Low-noise custom capacitors
- Dual “Sierra” feedback/correction circuitry

Gain Control
- Rotary gain control to match input signal voltage
- Input Sensitivity:
  - Line level: 0.1 volts to 4.0 volts
  - Speaker level: 0.4 volts to 10 volts
Input Configuration
- Input Level Switch: Hi (speaker level) or Lo (line level)
Crossover and Filter Controls
- Low-Pass Filter:
  - Always engaged (cannot be bypassed)
  - Adjustable from 50 Hz to 400 Hz
  - 24 dB/octave slope
- Subsonic Filter:
  - Adjustable from minimum to 40 Hz
  - 24 dB/octave slope
  - Removes super-low frequencies that subwoofers cannot cleanly reproduce
- Bass EQ (Bass Boost):
  - Adjustable from 0 dB to +12 dB
  - Centered at 50 Hz
Turn-On Options
- 2-way switch:
  - REM: Remote turn-on lead from head unit
  - DC: Automatic activation by DC voltage from speaker-level inputs

Power/Ground Terminals: Set-screw terminals (accept up to 4-gauge wire)
Remote Turn-on Terminal: Set-screw terminal (accepts up to 8-gauge wire)
Speaker Output Terminals: Two pairs of set-screw terminals (accept up to 8-gauge wire)
- Internally wired in parallel for easy connection of multiple subwoofers
Signal Inputs:
- Stereo RCA jacks
- Compatible with line-level or speaker-level signals
- Speaker-level inputs require RCA adapter cables (not included)
Preamp Outputs:
- Two RCA jacks for system expansion
- Pass-through design (unaffected by amplifier’s settings)
Remote Control Port: RJ-25 jack for optional RUX-KNOB.2 wired remote bass level control

Alpine R2-A75M