Ground Shaker GS-JGM212B Dual 12″ Sealed Sub Box — Fits 07–18 GMC Sierra Extended Cab
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Ground Shaker GS-JGM212B Dual 12″ Sealed Sub Box — Fits 07–18 GMC Sierra Extended Cab
Product Overview
Description
Key Features
- Vehicle-specific enclosure for the 07–18 GMC Sierra Extended Cab
- Dual 12″ sealed design
Specifications
| SKU | GS-JGM212B |
| Application | 07–18 GMC Sierra Extended Cab |
| Enclosure Type | Sealed |
| Woofer Size | Dual 12″ |
| Specifications | -CUTOUT DIAMETER: 11 1/8″ -AIR VOLUME: 1.26 ft³ -2 INDIVIDUAL CHAMBERS -VOLUME PER SUBWOOFER: 0.63 ft³ -WEIGHT: 37 lbs -MOUNTING DEPTH: 6 1/2″ DIMENSIONS: -FRONT HEIGHT: 9 1/4″ -REAR HEIGHT: 7 1/4″ -LENGTH: 55 1/2″ -DEPTH: 13 1/2″ CONSTRUCTION: -5/8″ HIGH QUALITY MDF WOOD -CARPETED WITH DURABLE TRUNK LINER FINISH -SEALED WITH HIGH QUALITY TITEBOND SILICONE -GLUED WITH HIGH QUALITY TITEBOND WOOD GLUE -2 BINDING POST TERMINALS INSTALLATION: -FITS UNDER REAR SEAT BEHIND THE DRIVER'S SIDE -DOWN FIRING -WILL NOT FIT 2007 CLASSIC |
Subwoofers not included. Price is each.
Free shipping on orders $100+
If you have any questions, you are always welcome to contact us. We'll get back to you as soon as possible, within 24 hours on weekdays.
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FAQs
Please read our FAQs page to find out more.
RMS vs. MAX power — which number do I actually care about?
RMS is what your gear handles continuously; MAX is the short burst it can survive without complaint. Match your amplifier's RMS output to your speakers' RMS rating — sizing off the MAX number is how magic smoke gets released.
What does the IP65 rating on DS18 marine gear actually mean?
It's dust-tight and rated against low-pressure water jets from any direction — built for spray, rain, and the occasional wave over the bow, not for full submersion. If something's going somewhere it could sit underwater, that's a different conversation entirely.
How do I match an amplifier to my speakers without guessing?
Add up the RMS rating of everything the amp will power, and pick an amp whose RMS output (at your speakers' impedance — usually 4-ohm) lands close to that total. Undersized is thin sound; wildly oversized is a fast way to blow a voice coil.
Can I mix marine-grade gear into a standard car audio setup, or the reverse?
You can run marine-grade gear in a car — it's just over-built for that environment, no downside besides cost. Running non-weatherproof car audio gear in an open UTV or boat is the direction that causes problems.
What gauge wiring kit do I need?
It scales with your amp's power draw and the length of the run — DS18's OFC kits come in 4-gauge and 8-gauge for a reason. Undersized wiring on a high-draw system is a voltage-drop and heat problem waiting to happen; when in doubt, size up.