Description
R2-A75M Mono Amplifier
The Alpine R2-A75M is a next-generation R-Series mono amplifier built to deliver strong output in a more compact chassis. With Alpine’s Class D amplifier circuit, a one-sided terminal layout, and top-panel sound controls under a removable cover, it is designed to combine output, efficiency, and easier installation in a wide range of vehicle applications.
Overview
Compact R-Series Mono Power
The R2-A75M is built for systems that need dedicated low-frequency amplification without taking up unnecessary space. Alpine states the chassis is 15% smaller than the previous R-A75M while maintaining the same core mono amplifier role in a more installation-friendly footprint.
Rated at 500 watts RMS into 4 ohms and 750 watts RMS into 2 ohms, the amplifier is designed for subwoofer duty and operates with Alpine’s Class D amplifier circuit for efficient power delivery.
- Mono amplifier rated for 500W RMS x 1 at 4Ω and 750W RMS x 1 at 2Ω.
- Class D amplifier circuit for efficient output in a compact chassis.
- Reduced footprint for easier placement in more vehicle applications.
Installation Design
Layout Focused on Access and Simplicity
The R2-A75M uses a one-sided terminal layout that places speaker connections on one side of the amplifier for cleaner routing and easier access during installation.
Amplifier controls are positioned on the top panel beneath a removable plate, allowing gain and crossover adjustments without reworking the full install position.
- One-sided terminal layout simplifies wiring access.
- Top-panel sound controls are easier to reach for setup changes.
- Removable cover helps keep adjustments protected when setup is complete.
Feature Highlights
Key Functional Details
Performance
Electrical and Audio Specifications
The R2-A75M power ratings are specified at 14.4V and ≤ 1% THD +N. Alpine lists a frequency response of 10Hz to 400Hz, a signal-to-noise ratio greater than 75dB, and a damping factor greater than 250.
- Power rating reference: 14.4V, ≤ 1% THD +N.
- Frequency response: 10Hz–400Hz.
- Signal-to-noise ratio: >75dB.
- Damping factor: >250.
Fitment
Compact Chassis Dimensions
Alpine lists the amplifier dimensions as 11.1 inches wide, 2.17 inches high, and 6.5 inches deep. That compact size helps support installation in tighter vehicle layouts where amplifier space is limited.
- Width: 11.1".
- Height: 2.17".
- Depth: 6.5".
- Designed around a reduced overall footprint.
| Model | Alpine R2-A75M |
| Amplifier Type | Mono amplifier |
| Amplifier Circuit | Class D |
| Power Rating Reference | 14.4V, ≤ 1% THD +N |
| Power Output @ 4Ω | 500W RMS x 1 |
| Power Output @ 2Ω | 750W RMS x 1 |
| Signal-to-Noise Ratio | >75dB |
| Frequency Response | 10Hz – 400Hz |
| Damping Factor | >250 |
| Dimensions | 11.1” W x 2.17” H x 6.5” D |
| Remote Bass Knob Compatibility | RUX-KNOB.2 or RUX-H01 (sold separately) |
In the Box
Included Accessories
- R2-A75M Mono Amplifier
- Owner’s Manual
- “Birth Sheet” certifying measured amplifier power
- (x4) Screws for amplifier mounting
- (x3) Allen wrenches for installation (2mm, 2.5mm, 3mm)
- Alpine Registration Card
- Alpine Limited Warranty Sheet
Optional remote bass knob functionality requires the RUX-KNOB.2 or RUX-H01, each sold separately.
