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Alpine® R-A90S R-Series 6/5/4/3 Channel Power Amplifier

Model #: R-A90S
At a Glance

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.

Available in Store Only
$99,999.00Save $NaN

Get to know this product.

  • Hi-Res Audio Compliant
  • Remote Bass-Knob ready with the RUX-KNOB.2 (sold separately)
  • Optimized for Alpine’s R-Series Sound System
  • Hi-Resolution Audio Compliant (40k Hz)
  • CTA-2006
  • Alpine’s Class D Amplifier Circuit
  • 75W x 4 + 150W x 2 (4Ω, 14.4V, < 1% THD +N)
  • 100W x 4 + 250W x 2 (2Ω, 14.4V, < 1% THD +N)
  • Bridged: 200W x 2 + 500W x 1 (4Ω, 14.4V, < 1% THD +N)
  • S/N > 85dB (ref. 1W into 4Ω)
  • THD + N < 0.03% (ref. 10W into 4Ω)
  • Frequency response: 10-45kHz (0/-3dB)
  • Damping factor > 500

Versatile System Builds

The R-A90S features a staggered power channel layout that allows each channel to host different levels of power, compared to traditional, multi-channel amplifiers. This allows the R-A90S to 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. Now you can use one amplifier to either power an active 3-way sound system or use it to power your speakers and subwoofer without the bulk of an additional amplifier.

Music In Hi-res

Hear the subtle details you’ve been missing in your music with the R-A90S. With the highest power output in its category, the R-A90S drives power to your sound system to create a big dynamic music range for the listener, reproducing high-frequency sounds up to 45k Hz, making the R-A90S Hi-Res Audio Compliant.

Useful Documents

Misc. Specs

Frequency Response10-45kHz (0/-3dB)
Manufacturer Warranty1 Year
WarningProposition 65 Warning for California Residents