INFINITY 5-CH High-Performance Amplifier

Here’s a detailed description of the Infinity Reference 7005A (REF-7005A) 5-channel car amplifier — its specs, features, and what to consider. If you like, I can also check its availability/prices in India.

Overview

• The REF-7005A is part of Infinity’s Reference series. Crutchfield+1

• It is a 5-channel amplifier: 4 channels for full-range/front & rear speakers + 1 channel dedicated for subwoofer. Crutchfield+1

• Uses a Class AB/D design: front and rear channels are AB, the sub channel is Class D. This helps with efficiency (especially for the sub) while retaining good sound quality for the speakers. Crutchfield+2sonicelectronix.com+2

Power Ratings

• Total RMS power output is approximately 760 watts depending on load and configuration. sonicelectronix.com+1

Inputs / Crossovers / Controls

• Input types:

  • Low-level (RCA) preamp inputs. Crutchfield+1

  • High-level (speaker-level) inputs are supported, with provided adapter wires. Useful when using factory head units without RCA outs. Crutchfield+1

• Crossover / Filters:

  • Front & rear channels have variable crossover filters: either high-pass, low-pass, or full-range. Frequency range approx 32 – 320 Hz, with a slope of ~12 dB/octave. Crutchfield+1

  • Subwoofer channel has a low-pass filter in same ~32-320 Hz range. Also has bass boost (0-12 dB) at ~45 Hz. And a phase switch (0° or 180°) to align with other speaker phase. sonicelectronix.com+1

• Remote control: includes a wired remote knob (RBC remote) to adjust subwoofer level from front of vehicle. Crutchfield+1

Other Features & Build

• Protection circuitry: safeguards against short circuits, over/under voltage, temperature etc. sonicelectronix.com+1

• Signal-sensing turn-on (for compatibility with factory radios) and a remote turn-on terminal. Crutchfield+1

• Compact footprint for a 5-channel amp: dimensions are approx 14-3/16″ × 7-1/8″ × 2-3/16″ (≈ 360 mm × 181 mm × 56 mm). Crutchfield+1

• Fuse rating: uses three 30A fuses (total ~90A) for power protection. sonicelectronix.com+1

Performance Expectations & Use Cases

• Good for a full car audio setup: you can power all four doors/front + rear speakers plus a subwoofer with one amp. Reduces need for multiple amps.

• Because of its Class D subwoofer channel, you get high power to the sub without very high current draw or heat compared to a full AB sub channel.

• The adjustable crossovers, bass boost, phase switch help in tuning the sound to your car (especially useful for getting the sub to blend well).

What to Check / Limitations

• Requires strong power wiring (preferably 4 AWG) and a solid ground to perform well. Poor wiring will cause voltage drops, reduced power, or distortion. sonicelectronix.com

• Subwoofer channel at 500 W is when under 2 ohms; make sure your sub’s impedance matches and that the amp can handle the load without overheating or going into protection.

• Even though front channels are powerful, they are not super-high power (50-75 W depending on impedance). If your speakers are high power/have low sensitivity, you might want more power for those.