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.
For the best possible sound experience, use the built-in bandpass, high pass, or low pass filter to individually power each component in your sound system and assign frequency bands for accurate and reliable sound reproduction.
The R-A90S maintains an extremely low phase shift throughout the music spectrum which minimizing audible imperfections in your music and allows your music to stay faithful to the original recording. The result is hair-raising detail that puts you in the center of the performance.
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. The result is music that stays true to the artist’s intention.
Hear the subtle details you’ve been missing in your music with the R-A90S.‚ÄØWith 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‚ÄØhigh-frequency sounds up to 45k Hz, making the R-A90S Hi-Res Audio Compliant.‚ÄØ
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 your subwoofer by adjusting the gain on your amplifier for quick bass adjustments when needed.
Alpine’s 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 is tuned to emphasize the characteristics of the R-Series speakers and subwoofers for a legendary R-Series experience.
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Number of Channels | 6 |
Class | D |
Peak Power Rating (Watts) | |
RMS Power Rating (Watts x Channels) - 4 Ohms | 75 x 4 150 x 2 |
RMS Power Rating (Watts x Channels) - 2 Ohms | 100 x 4 250 x 2 |
RMS Power Rating (Watts x Channels) - 1 Ohms | N/A |
RMS Power Rating - Bridged | 200 x 2 500 x 1 |
Minimum Impedance Unbridged (Ohms) | 2 |
Minimum Impedance Bridged (Ohms) | 4 |
THD at Rated RMS Power | 1% |
Bulit-in Crossover - Low Pass | Yes |
Built-in Crossover - High Pass | Yes |
High Pass Crossover Frequency (Hz) | 50-6000hz |
Low Pass Crossover Frequency (Hz) | 50-400hz |
Signal-to-Noise Ratio | 85dB |
Bass Boost | No |
Bass Remote Included | No |
Fuse Rating | 90A |
CEA-2006 Compliant | Yes |
Maximum Power Wire Gauge Size | 4 gauge |
Warranty | 1 Year |
For all orders exceeding a value of 100USD shipping is offered for free.
Returns will be accepted for up to 10 days of Customer’s receipt or tracking number on unworn items. You, as a Customer, are obliged to inform us via email before you return the item.
Otherwise, standard shipping charges apply. Check out our delivery Terms & Conditions for more details.