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Customer Reviews

Alpine R-A90S

Alpine R-A90S R Series 6-channel car amplifier — 75 watts RMS x 4 at 4 ohms + 250 watts RMS x 2 at 2 ohms

MFR # R-A90S

4.5 out of 5 stars
7 reviews
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Alpine R-A90S

Jeff from Tulsa, OK on 1/11/2024

2018 Toyota 4Runner

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Great amp!

Pros:

Cons:

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0 of 0 found this helpful

Alpine R series Amp R-A90S

Todd from Haslet, TX on 8/27/2023

1999 Toyota Land Cruiser

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So far great! Perfect. As I would expect from Alpine R series. Very flexible, and easy to configure.

Pros: Easy to install

Cons: None, maybe costs

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0 of 0 found this helpful

Alpine R-A90S

Joseph from Wilmington, NC on 12/24/2022

2008 Lexus IS350

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Solid amp for a full car upgrade

Pros: Small footprint

Cons: Not 2 ohm stable for sub bridge but just get the right Dvc or single voice coil configuration

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1 of 3 found this helpful

Durand

Kurt from Durand on 12/10/2021

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I wasted so much time chasing what I thought was a bad ground, only to find out that the amp going into protect mode was due to over-voltage sensitivity of the high level input circuit. I was feeding the speaker wires from a 2016 Ford Fusion head unit direct into the amp with the hi level circuit selected. It wasn't until I finally consulted with Alpine, and they told me an LOC was required. What's the point of having high level inputs (rated at 10V) if they can't handle a wimpy stock radio signal? BTW, I ended up using an Audio Control LC7i, and it did the trick.

Pros: Easy install Nice quality weight and feel

Cons: Can't handle line level inputs as advertised.

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2 of 4 found this helpful

Good all-around amp

Crutchfield customer from Rogers, AR on 9/12/2021

2015 Jeep Wrangler Unlimited

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Nice to be able to add a couple speakers to my existing stereo and push more power to all 6.

Pros: Nice features

Cons:

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2 of 5 found this helpful

Alpine R-A90S

Crutchfield customer from Glendale, AZ on 7/2/2021

1993 Ford F Series

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Perfect for the money.

Pros:

Cons:

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0 of 3 found this helpful

Incredible and versatile amp.

Cheapskate from PA on 10/15/2020

2014 Toyota Tacoma

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This amp offers so much value and versatility that few other six channel amps can match. Here are some highlights for me. 1. Channels 5 and 6 put out twice the watts as channels 1-4. I cannot overstate how awesome this is. The extra power is fantastic for midbass drivers if you are running 3-way active or great if you are bridging it to run a subwoofer (500 watts RMS @ 4 ohms) in 3 or 5 channel mode. 2. Bandpass filtering. I don't have a DSP or high end head unit so I have no way to run a bandpass filter. But thanks to this amp, I can run an active two way component setup and attenuate the tweeters since higher frequencies tend to sound harsh/painful to my ears. This amp lets me run 80-4000hz to the woofers, 4000+ hz to the tweeters and 80hz and below to the subwoofer. The vast majority of other multi-channel amps only have high and low pass filters up to 500hz or so. 3. Fits under the driver seat of my Tacoma. 4. Underrated output. My birth sheet says says 118w @ 2 ohms for channels 1-4 and 272w @ 2 ohms for channels 5-6. 5. Bought a scratch and dent model and it looks brand spanking new. 6. My 8 inch JL Audio Microsub sounds great with this amp. 7. Amp has a very solid build quality and feel. Alpine is not some flea market brand. I could not be happier with this purchase and cannot wait to get better speakers for it.

Pros: Plenty if power for virtually all applications. Bandpass filtering. Crossover frequencies adjustable beyond 500hz unlike most amps these days.

Cons: Only does 4 ohms bridged on any of the channels.

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46 of 49 found this helpful

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