Alpine R-A90S 6/5/3-Channel Power Amplifier

Experience high-resolution audio with the versatile Alpine R-A90S 6-channel amplifier, designed to deliver precise sound reproduction and hair-raising detail. This powerful unit features a unique staggered power layout, providing double the power on the final two channels for enhanced performance.

The R-A90S is built to grow with your sound system, functioning effectively as a 3-way active or 5-channel amplifier to suit your specific needs. With its low phase shift and high-resolution frequency response, this amplifier ensures your music remains faithful to the artist's original intention.

Key Features

Dimensions	32.4 cm x 27.3 cm x 5.1 cm
Hi-Resolution Audio Compliant	40 kHz
Amplifier Circuit	Class D
Power Output (4Ω, 14.4V, < 1% THD +N)	75W x 4 + 150W x 2
Power Output (2Ω, 14.4V, < 1% THD +N)	100W x 4 + 250W x 2
Bridged Power (4Ω, 14.4V, < 1% THD +N)	200W x 2 + 500W x 1
S/N	> 85dB (ref. 1W into 4Ω)
THD + N	< 0.03% (ref. 10W into 4Ω)
Frequency response	10-45 kHz (0/-3dB)
Damping factor	> 500
CTA-2006	Yes

Highlights

6-Channel Amp with 5-Channel Power – With double the power on the last two channels, the R-A90S’s 5th and 6th channels can be bridged to provide up to 500-watts at 4Ω to a subwoofer system such as a pair of S-SB12Vs.
An Amp that Grows with You – The R-A90S can be used to amplify a 3-way active system with enough mid-bass power to create up-front bass impact.
Accurate Sound Reproduction – With incredibly low phase shift and hi-resolution frequency response, the R-A90S reproduces sound with accuracy that stays true to the artist’s intention.

Videos

Compatibility

The R-A90S has input capability to add an optional RUX-KNOB.2 Remote Bass Control Knob (sold separately). The remote bass knob controls the bass in the subwoofer by adjusting the gain on the amplifier for quick bass adjustments when needed.

Downloads

• Performance Specs
• Application Guide
• Owner's Manual
• Tech Spec Sheet
• Application Guide

Frequently asked questions Can the R-A90S be used to power a subwoofer? Yes, the 5th and 6th channels can be bridged to provide up to 500 watts at 4Ω, making it suitable for powering subwoofer systems. Is this amplifier compatible with a remote bass knob? Yes, the R-A90S is compatible with the optional RUX-KNOB.2 Remote Bass Control Knob, which is sold separately. What is the frequency response of the R-A90S? The amplifier features a high-resolution frequency response of 10-45 kHz (0/-3dB). Does the R-A90S support 3-way active systems? Yes, the unique staggered power layout allows the amplifier to function as a 3-way active amplifier, providing power where it is needed most.