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Upgrade your truck audio system with the Ground Shaker GS-TOYTC18B under-seat subwoofer enclosure, engineered for tight-fit installations without sacrificing bass performance. Built from durable 5/8" high-quality MDF wood, this enclosure delivers a solid, vibration-resistant structure that enhances low-frequency response for deep, clean bass inside your cabin.
Designed for serious sound performance, the GS-TOYTC18B features a fully sealed construction reinforced with premium wood glue and Titebond silicone for an airtight fit. This ensures tighter bass response, improved accuracy, and long-lasting durability. The enclosure is finished with a durable trunk-liner carpet, giving it a clean, factory-style appearance that blends seamlessly into your vehicle interior.


Perfect for space-saving installations, this upward-firing under-seat subwoofer enclosure is designed to maximize bass projection directly into the cabin. It includes a spring-loaded terminal for secure and reliable wiring connection. Please note, installation may require minor trimming under the seat depending on subwoofer height, and it is not compatible with hybrid trucks or carpeted storage compartments.

With the aim of providing high acoustical output even when used with lower power, the APS 8 R was designed for use in an 8.5-litres reflex enclosure, with tuning between 30 and 40Hz. The APS 8 R has been specifically developed to be combined with either the AP8.9 bit or AP4.9 bit / AP4 D. Prima subwoofer components have been developed with a primary goal: to deliver high output in tight spaces. Output is a matter of excursion; the more air the cone moves, the more output. However reduced mounting depth traditionally has meant low excursion.
Prima subwoofers employ a special cone-dustcap-basket geometry which guarantees large excursion of the mobile group, while keeping the mounting depth to a minimum. The surround and spider have been carefully designed to prevent the “rocking-mode” phenomenon. The cooling circuit has been designed with air vents on the basket underneath the spider, eliminating the need for vents on the bottom-plate. This allows the subwoofer to be mounted close to the back wall of the enclosure, making the most of the reduced mounting depth.

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