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Brand: Alpine
Product Code: R-A90S
Availability: 1
- Tech Sheet_R-A90S.pdf
UPC: 793276242952
Location: Cleveland, Ohio
Experience your music in Hi-Res with the versatile R-A90S 6-Channel Amplifier for hair-raising details that puts you in the center of the performance.

Price: $599.95

Experience the impressive power and exceptional performance of the Next-Gen R-Series R2-A60F 4-Channel Amplifier, now certified for Hi-Res Audio Playback.


  • Hi-Res Audio Compliant (Up to 40kHz)
  • 900W 6-Channel Amplifier
  • One-Sided Terminal Layout
  • Side Panel Sound Controls
  • Optional Remote Bass Knob Compatible (required RUX-KNOB.2 or RUX-H01, sold separately)
  • Power Output: 75W RMS x 4 + 150W RMS x 2 @ 4Ω, 100W RMS x 4 + 250W RMS x 2 @ 2Ω
  • Bridged Power: 200W x 2 + 500W x 1 @ 4Ω
  • Frequency Response: 10Hz – 45kHz


Accurate Sound Reproduction

Hear the subtle details you’ve been missing in your music. The R-A90S maintains an extremely low phase shift throughout the music spectrum, which minimizes audible imperfections in your music and allows your music to stay faithful to the original recording. With a hi-resolution frequency response, the R-A90S can reproduce sound with incredible accuracy that stays true to the artist’s intention.

Alpine R-A90S

The R-A90S has a unique staggered power channel layout that has double the power on the last two channels. When looking to power a dual subwoofer configuration, the R-A90S’s 5th and 6th channels can be bridged to provide up to 500-watts at 4Ω. The R-A90S is matched in power and performance for the Dual 10-inch Alpine Halo S-Series Preloaded Subwoofer Enclosures with ProLink™.


Thanks to the unique staggered power channel layout, the R-A90S can host different levels of power on each channel, compared to traditional, multi-channel amplifiers. This allows the R-A90S to grow with you as it can effectively function as both a 3-way active amplifier and a 5-channel amplifier by delivering the power you need to the channels where you need it the most.

Alpine Exclusive Technology

Using custom Alpine internal components originally launched in Alpine’s premium X-Series amplifiers, the R-A90S has dual post-filter feedback loops that correct signal distortion by making the output as close as possible to the original input for accurate sound reproduction.

Amplifier Brand Alpine
Channels 6
RMS/MAX Power Per Channel 75W RMS x 4 + 150W RMS x 2 @ 4Ω, 100W RMS x 4 + 250W RMS x 2 @ 2Ω
Max Amplifier Power 900 Watts
Minimum Impedance Per Channel 2 Ohm
Speaker Level Inputs Yes
Built in Crossover High Pass, Low Pass, Band Pass
Preamp Outputs No
Bass Knob Control Yes, Optional
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Access 1 Alarm & Audio
10418 Lorain Ave.
Cleveland, OH 44111
(216) 252-3000


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