Modern Connectivity
Seamless Apple CarPlay® and Android Auto™ for navigation, music, and calls.
"Fit perfectly and worked exactly as expected — support was excellent."
Alpine R-A90S
Upgrade Your Vehicle With Confidence. This Is Built to Fit, Perform, and Last
Real installer support before and after purchase
Price Match Guarantee
Full Manufacturer 2 Years Warranty
Free 30-Day Returns
Check Compatibility
2 left in stock
Ships within 1-3 days
Authorized Dealer Guaranteed
The Alpine R-A90S is a versatile 6-channel amplifier from Alpine's R-Series, designed to deliver high-resolution audio with a unique staggered power configuration. This amplifier provides flexibility for various system setups, including 3-way active systems and powerful subwoofer configurations, ensuring precise and dynamic sound reproduction.
Key Features
| Feature | Details |
|---|---|
| Power Output |
|
| Amplifier Class | Class D with Dual "Sierra" Post-Filter Feedback Loops |
| High-Resolution Audio | Compliant up to 45kHz frequency response |
| Crossover Controls |
|
| Input Options | Speaker-level and preamp inputs with GTO™ (Great Turn-On) signal-sensing |
| Remote Control | Compatible with Alpine RUX-KNOB.2 for subwoofer level control (sold separately) |
| Design | Compact chassis with one-sided terminal layout for easy installation |
What’s in the Box
| Alpine R-A90S 6-Channel Amplifier |
| Three 30-amp ATO fuses (installed) |
| 4 Mounting feet |
| Four 3/4" Screws |
| Eight M2.5x5.5mm Machine screws |
| 2mm Allen wrench |
| 3mm Allen wrench |
| Owner's Manual |
| Alpine Verification Certificate |
| Warranty Information |
| Power Supply Note |
| Online Product Registration Information |
- Ships within 1–3 business days from our warehouse
- Tracking included with every order
- Free 30-day returns if it doesn’t work for your setup
- 2-year manufacturer warranty
- Authorized dealer guarantee
- Real installer-backed support before and after purchase
Alpine R-A90S
Sale price$699.95
Why This Upgrade Makes Daily Driving Better
Ease of Use & Safety
Hands-free control reduces distraction and frustrationwhile driving.
Expandable by Design
Add backup cameras, better speakers, amps, or subsanytime.
FITMENT & INSTALLATION MADE SIMPLE
WHAT VEHICLES IT WORKS WITH
FIND THE RIGHT PRODUCT FOR YOUR EXACT VEHICLE
We verify compatibility before you buy, no guesswork.
DIY FRIENDLY IF:
- You're comfortable with basic tools
- You follow provided instructions
PROFESSIONAL INSTALL RECOMMENDED IF:
- Your vehicle requires dash kits or wiring adapters
- You want a turnkey experience
INSTALLATION CREDIT & SUPPORT:
- $75 Installation Credit when purchased online
- Speak to real installers before you buy
- Bring it into one of our locations for install
40 Years of Installation Experience
Tens of Thousands of Installs Completed
Authorized Dealer Full Warranties
Why Buying This Here Is Safer Than Anywhere Else
 |
MARKETPLACES | |
|---|---|---|
|
Verified Vehicle Fit
|
||
|
Installer Support
|
||
|
Authorized Products
|
||
|
Easy Returns
|
||
|
Physical stores & real installers
|
FREQUENTLY ASKED QUESTIONS
FREQUENTLY ASKED QUESTIONS
How do I know this stereo or speaker will fit my car?
Select your year, make, and model using the Vehicle Fit Guide at the top of the page. You’ll only see products that are compatible with your exact vehicle setup.
What happens if I order something that doesn’t fit?
You can return or exchange it within 30 days. We’ll help you identify the correct part for your vehicle so you don’t have to guess again.
Are these products brand new and covered by warranty?
Yes — all products are brand new, authentic, and sold as an authorized dealer, which means they include a full manufacturer warranty.
Can you install this for me, or do I need to do it myself?
You can do either. Install it yourself, or use your $75 installation credit at our shop and have it professionally installed by our team.
What if I don’t know what to choose for my car?
Tell us your vehicle and what you want to improve (sound, bass, CarPlay, etc.). We’ll recommend the exact products that fit your car and your budget.
Free shipping
Free Shipping to the Lower 48 States
Customer service
Our Customer support and sales experts are always available to help
Secure payment
We accept Apple Pay, Paypal, and all major credit cards through our encrypted processor.