Alpine R2-A75M

Performance & Power

• 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

Physical Dimensions

• 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 Design

• 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

Controls and Settings

• 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

Connections

• 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