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JBL Marine A758
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
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2 left in stock
Ships within 1-3 days
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JBL Marine A758 8-Channel Marine Amplifier
The JBL Marine A758 is a high-performance, Class D 8-channel amplifier specifically engineered for the marine environment. It delivers a robust 75 watts RMS per channel at 4 ohms, providing a total system solution capable of powering an entire vessel—from the cabin and deck to the fore and aft. Its high-efficiency design ensures maximum power output while minimizing current draw on your boat's battery.
Key Features
Massive Multi-Channel Versatility
The A758 is exceptionally flexible. You can run it in its standard 8-channel mode or bridge it to 4-channel mode to deliver a powerful 250 watts RMS to four high-performance speakers or subwoofers. It also supports 5-channel and 7-channel configurations, making it easy to create a custom mix of full-range speakers and dedicated bass.
Marine-Grade Durability
Built to withstand salt spray and moisture, this amplifier features conformal-coated circuit boards and stainless steel connections to resist corrosion. Its low-profile chassis is designed to fit into tighter compartments commonly found on boats, while the Balanced Differential Inputs reject electrical and engine noise for a cleaner signal.
Universal System Integration
Whether you have a factory-installed marine radio or an aftermarket head unit, the A758 can integrate seamlessly. It includes both preamp and speaker-level inputs (with bare wire-to-RCA adapters included). The selectable turn-on modes (DC or REM) ensure the amp powers up correctly based on your source unit's signal.
Precision Audio Tuning
Each channel pair features independent variable electronic crossovers (32–320 Hz) and gain controls. This allows you to precisely set the frequency roll-off for different speaker types, such as setting a high-pass filter for cabin speakers and a low-pass filter for a bridged subwoofer.
Technical Specifications
| Category | Specification |
| Power Output (RMS) | 75W x 8 @ 4Ω / 125W x 8 @ 2Ω |
| Bridged Power (RMS) | 250W x 4 @ 4Ω |
| Total RMS Power | 1000 Watts |
| Frequency Response | 20 Hz – 20 kHz |
| Crossover Filters | Variable High/Low-Pass (32–320 Hz) |
| Signal-to-Noise Ratio | 80 dB |
| Dimensions (WxHxD) | 14-3/16" x 2-1/16" x 7-1/8" |
| Recommended Wire | 4-Gauge Power and Ground |
- 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
JBL Marine A758
Sale price$659.95
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
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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.
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