SKU: 54355534105

Alpine R-A90S : 6ch Hi-Res Amplifier, 100W/75W x 4ch + 250W/150W x 2ch @ 2Ω/4Ω

Sale price$315.00 Regular price$350.00
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Description

Alpine R-A90S : 6ch Hi-Res Amplifier, 100W/75W x 4ch + 250W/150W x 2ch @ 2Ω/4ΩR Series 6 Channel Class D Full Range Hi Resolution Automotive Grade Amplifier, 75 Watts x 4 Channel + 150 Watt Mono @ 4 Ohms, or 100 Watts x 4 Channel + 250 Watt Mono @ 2 Ohms The R A90S has a unique staggered power channel layout that has double the power on the last two channels. When looking to power a dual subwoofer configuration, the R A90Ss 5th and 6th channels can be bridged to provide up to 500 watts at 4. The R A90S is matched in power and

R-Series 6-Channel Class-D Full-Range Hi-Resolution Automotive-Grade Amplifier, 75-Watts x 4-Channel + 150-Watt Mono @ 4-Ohms, or 100-Watts x 4-Channel + 250-Watt Mono @ 2-Ohms

The R-A90S has a unique staggered power channel layout that has double the power on the last two channels. When looking to power a dual subwoofer configuration, the R-A90S’s 5th and 6th channels can be bridged to provide up to 500-watts at 4Ω. The R-A90S is matched in power and performance for the Dual 10-inch Alpine Halo S-Series Preloaded Subwoofer Enclosures with ProLink™.

Thanks to the unique staggered power channel layout, the R-A90S can host different levels of power on each channel, compared to traditional, multi-channel amplifiers. This allows the R-A90S to grow with you as it can 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. 

Hear the subtle details you’ve been missing in your music. The R-A90S maintains an extremely low phase shift throughout the music spectrum, which minimizes audible imperfections in your music and allows your music to stay faithful to the original recording. With a hi-resolution frequency response, the R- A90S can reproduce sound with incredible accuracy that stays true to the artist’s intention.

Using custom Alpine internal components originally launched in Alpine’s premium X-Series amplifiers, the R-A90S has dual post-filter feedback loops that correct signal distortion by making the output as close as possible to the original input for accurate sound reproduction.

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 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.

Features
  • 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 – When you’re ready to upgrade your Alpine system, use the R-A90S to amplify a 3-way active system with enough mid-bass power to create the up-front bass impact you crave.
  • Accurate Sound Reproduction – With incredibly low phase shift and hi-resolution frequency response, the R-A90S can reproduce sound with incredible accuracy that stays true to the artist’s intention. 
Specifications
  • Dimensions: 12.75" x 10.75" x 2"
  • Hi-Resolution Audio Compliant (40k Hz) 
  • 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
  • CTA-2006
Documentation
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 54355534105

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4.2 ★★★★★
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Briana C.
Grantham, US
★★★★★ 4
Nice quality, shape not for me
Fit Type: Oversized, Size: Medium, Color: Medium Blue Vintage
This was just too boxy for my body. Material was nice, quality jean material. Color was true to image. It was a little stiff but as you would expect with nice, new and unwashed denim.
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Reviewed in the United States on May 31, 2026
M
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M1so
Port Orchard, US
★★★★★ 5
Solid basic good denim jacket
Fit Type: Regular, Size: X-Large, Color: Authentic Medium Wash
In direct comparison to Levi’s women’s trucker denim jacket, this one is: slightly heavier denim, less stretchy, less fitted. I kept this one and returned the Levi’s because I wanted the roomier fit. I wish it was a little longer in the body: I’m tall, and it isn’t too short but I’d like a little more length. It feels slightly longer than the Levi’s. I wish the sleeves were longer too. They are probably just right for an average height or shorter person. The armholes could be smaller. The medium wash is a nice medium blue, fairly even in tone. It doesn’t have a lot of stretch but it’s comfortable. The denim is substantial but not too stiff. Overall, it’s a standard good quality denim jacket without any peculiar style elements or weird cut. It’s good!
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Reviewed in the United States on April 3, 2026
M
Verified Purchase
Maryland Marcy
Waukegan, US
★★★★★ 3
Fabric way to heavy.
Fit Type: Regular, Size: Medium, Color: White
Cute, but material is WAY to heavy, like the heaviest duty denim I've ever seen. Wanted this to be a cute coverup. If you're needing something while breaking broncos or riding your motorcycle would probably be great. I kept it for a while because it was good quality and well made, but it ended up in the donation pile as I'd never wear this.
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Reviewed in the United States on June 10, 2026
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Clare Lukes
Omaha, US
★★★★★ 5
Awesome jacket
Fit Type: Regular, Size: Medium, Color: Stone Dark Wash
Love it so not too long or too short but just right and the color is out of sight and fits awesome
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Reviewed in the United States on June 12, 2026
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M
Grantham, US
★★★★★ 5
Old school denim — not stretchy
Fit Type: Regular, Size: X-Small, Color: Authentic Medium Wash
Fabric used is old school denim — not the thin, stretchy stuff that pretty much everything called “denim” is today. It is 99% cotton (20% of which is recycled cotton) and 1% elastane, but I can’t feel any stretch in the fabric. It is a substantial, non-stretchy denim that gives the jacket really good structure. It has a higher end fit and look than the price would suggest. I wanted a more fitted denim jacket so ordered an XS even though according to the size chart I need a small. (I have a 34.5” bust, 28” waist at 118 pounds 5’4”.) It still buttons over a t shirt or lightweight sweater with freedom for movement/without being tight, but if I wanted a roomy fit or the ability to wear a heavier sweater or sweatshirt underneath and still be able to comfortably button it I would have needed a small. The shoulders are cut broad — I have very broad shoulders and the XS surprisingly fits my shoulders well. This jacket may not be the greatest fit for you if you have very narrow shoulders, unless you are going for an oversized look.
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Reviewed in the United States on May 17, 2026

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