Modern Connectivity
Seamless Apple CarPlay® and Android Auto™ for navigation, music, and calls.
"Fit perfectly and worked exactly as expected — support was excellent."
JL Audio M6-8IB-S-GmTi-4
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
Upgrade your boat's sound system with the JL Audio M6-8IB-S-GmTi-4, an 8-inch marine subwoofer engineered to deliver deep, distortion-free bass in even the most demanding open-air marine environments. Designed with premium materials and True-Marine™ durability, this subwoofer brings power and precision to your music—perfect for cruising, fishing, or entertaining on the water.
| Feature | Description |
|---|---|
| Speaker Size | 8 inches |
| Power Handling | 200 watts RMS / 400 watts peak |
| Impedance | 4 ohms |
| Frequency Response | 30 Hz – 250 Hz |
| Sensitivity | 84.2 dB @ 1W/1m |
| Mounting Depth | 5.12 inches |
| Cutout Diameter | 7.375 inches |
| Grille Style | Sport Grille (Gunmetal/Titanium) |
| Design Features | True-Marine™ construction, injection-molded mica-filled polypropylene cone, synthetic rubber surround, infinite-baffle operation, long-excursion design |
What’s In the Box
- JL Audio M6-8IB-S-GmTi-4 8" Marine Subwoofer
- Sport Grille (Gunmetal/Titanium, pre-installed)
- Mounting Hardware
- Installation Guide
- 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
JL Audio M6-8IB-S-GmTi-4
Sale price$379.99
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
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Physical stores & real installers
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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
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