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Alpine R-Series 6/5/4/3 Channel Hi-Res Audio Power Amplifier (RA90S)

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  • All-new Advanced Digital Design
  • Compact Chassis
  • Easy Access Controls
  • Low-level RCA Inputs and High-level Speaker Inputs
  • Bandpass Filter
  • Superior Sound Stage
  • Bridgeable
  • Bass EQ
  • High Pass/High Pass High/Low Pass Filters (HPF/HPF-H/LPF)
  • Thermal Protection
  • Rotatable Alpine Badge
  • Remote Bass Knob Ready (RUX-KNOB.2)
  • Hi-Res Audio Certified


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The all-new R-A90S is extreme and class-leading in every way. Beneath its sophisticated and bold design, brings a powerhouse of Alpine ingenuity and technical innovation to create an industry first ‘full-system’ 6-Channel Hi-Res compliant power amplifier.

Delivering serious amounts of power, the R-A90S has the capability to power an entire system with a subwoofer, or can be configured to power an array of 3-way high-end speaker systems with precision using the LP/HP/HP-H/BP crossovers. What’s more, power output is staggered with the capability to deliver different levels of power to each channel regardless of the system configuration.

With performance at the highest standard, the R-A90S has a dynamic range of up to 45kHz and a >500 dampening factor to deliver high power output with precision, as well as a superlative high-definition sound experience.

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. With ground-breaking multi-functionality and high-power output, Alpine’s all new R-A90S R-Series amplifier enters a new world of Hi-Res sound.

Check out the video at the bottom of the page for more tips on how the R-A90S can take your system to the next level!

All-new Advanced Digital Design
The innovative R-Series amplifier boasts an advanced digital design which unlike a typical Class-D amplifier circuit adds all-digital dual post-filter feedback loop for unmatched accuracy and control, while minimising internal noise.

Extraordinary Damping Factor
The R-A90S R-Series amplifier produces an extraordinary damping factor of >500 for channels 1/2/3/4 and >500 for channels 5/6. This achieves precision control of cone movement at high power outputs with virtually zero distortion.

Hi-Res Audio Compliant
The R-A90S is Hi-Res Audio certified and engineered to operate in an extended frequency range of 10Hz~45kHz. Furthermore, signal-to-noise specifications are at benchmark levels with 103dB for channels 1/2/3/4 and 106dB for 5/6.

Precision Crossovers
The R-A90S is built for system flexibility and precision setup with its extensive crossover capabilities. You can set the HP/LP filters for a full system with a subwoofer, or use the HP-H and bandpass filters for an active 3-Way speaker system.

Benchmark Sound Staging
The R-A90S is optimised for benchmark sound quality, as well as staging and imaging. Rivaling the industry with an incredibly low phase shift of 46° this superior phase curve ensures accurate and defined sound imaging.

Accurate Sound Reproduction
Using the same exclusive technology launched in Alpine’s premium X-Series amplifiers, the R-A90S has dual “Sierra” post-filter feedback loops that correct signal distortion by making the output as close as possible to the original input.

RCA and Speaker Level Inputs
The R-A90S is equipped with low-level RCA inputs, which can also accept high-level speaker signal inputs (via the optional KCE-SP2R). This allows for installation of the amplifier into virtually any aftermarket or OEM factory audio system.

Heavy Duty Gauge Terminals
The speaker and power cable terminals are conveniently located on the 6-channel amplifier providing easy and clean installation. The compact and robust design delivers lossless connectivity.

Control Your Subwoofer
The optional RUX-KNOB.2 remote bass knob controller plugs right into the R-A90S amplifier, providing quick direct subwoofer control to make bass adjustments on the fly enhancing your listening experience. Does your system run two bass knob ready amplifiers? With the use of an additional accessory*, control the bass levels of both of your amplifiers with only one controller.

Optimised for Alpine’s R-Series Sound System
Alpine’s stunning R-Series line of speakers, subwoofers, and amplifiers have a heritage of sound quality that can be heard from a block away. The R-A90S 6-channel amplifier is tuned to emphasise the characteristics of the R-Series speakers and subwoofers for a legendary R-Series experience. Visit the systems page to browse our range of systems packs.

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