Ground Shaker GS-FF150P48B Quad 8″ Ported Sub Box — Fits 09–26 Ford F-150 Crew Cab
Enclosure only — subwoofers not included.
Free shipping on orders over $150
Continental US · processed within 1–2 business days
Ships direct from Ground Shaker in California, usually within 1–2 business days.
Award Winning Sound
2-Year Limited Warranty
Variety of Payment Options
Ground Shaker GS-FF150P48B Quad 8″ Ported Sub Box — Fits 09–26 Ford F-150 Crew Cab
Product Overview
Description
This Ground Shaker quad 8" ported enclosure is cut for the 09–26 Ford F-150 Crew Cab; it sits under the rear seat and fires forward. Being ported and tuned to 45 Hz, it plays louder and deeper than a sealed box would in the same spot with 2.10 cubic feet of air volume, for anyone who wants the bass felt and not just heard.
Key Features
- Vehicle-specific enclosure for the 09–26 Ford F-150 Crew Cab — fits under the rear seat
- Quad 8″ ported design with 2.10 ft³ air volume, tuned to 45 Hz
- Two slot ports (H-4½″ × W-2½″ × L-12½″) with forward-firing woofers
- ⅝″ high-quality MDF construction, carpeted in a durable trunk-liner finish
- Sealed with Titebond silicone and glued with Titebond wood glue
- Two spring-loaded terminals
Specifications
| SKU | GS-FF150P48B |
| Application | 09–26 Ford F-150 Crew Cab (under rear seat) |
| Woofer Size | Quad 8″ |
| Cutout Diameter | 7⅛″ |
| Air Volume | 2.10 ft³ |
| Tuning Frequency | 45 Hz |
| Ports | 2 slot ports (H-4½″ × W-2½″ × L-12½″) |
| Mounting Depth | 6½″ (with a 6″ magnet diameter) |
| Enclosure Type | Ported |
| Firing Direction | Forward-firing |
| Front Height | 9″ |
| Rear Height | 5½″ |
| Length | 56″ |
| Depth | 13″ |
| Construction | ⅝″ MDF, carpeted trunk-liner finish, Titebond silicone seal and wood glue |
| Terminals | 2 spring-loaded terminals |
| Weight | 46 lbs |
| Color | Black |
Subwoofer option
Add four DS18 SRW8.4 shallow-mount 8" subwoofers — 150W RMS / 300W MAX, SVC 4-ohm, 2.95" mounting depth, 7.12" front-mount cutout per DS18's dimension drawing — and they ship with the box, one per woofer opening. This box is cut 7⅛″ with 6½″ of mounting depth, so the SRW8.4 fits as shipped. Choose "Box only" to buy the enclosure alone.
Box-only option: subwoofers not included. Price is each.
Free shipping on orders $150+
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.
-
Shipping Information
Use this text to answer questions in as much detail as possible for your customers.
-
Customer Support
Use this text to answer questions in as much detail as possible for your customers.
-
FAQ’s
Use this text to answer questions in as much detail as possible for your customers.
-
Contact Us
Use this text to answer questions in as much detail as possible for your customers.
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.