Alpine R-A90S R-Series Extreme 6 Channel Amplifier High Definition HI-RES Audio

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.

Alpine R-A90S Features:
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

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.

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.