Sky High Car Audio FXB Series 6.5" Subwoofer

Sky High Car Audio FXB Series Subwoofers

Available in 6.5” – 18” | D2/D4 Ohm Options

FXB: Sky High Performance. Everyday Price.

The FXB Series by Sky High Car Audio is designed to deliver powerful, controlled bass at an unbeatable value. Built for those who want serious performance without breaking the bank, the FXB Series brings real-world output, reliable design, and our signature engineering approach to a more accessible price point. Whether you’re upgrading your daily driver or building a clean, budget-conscious system, the FXB Series offers solid performance with no shortcuts where it counts.

The FXB Series 6.5” is compact, efficient, and surprisingly potent. With a 15mm Xmax, 400W RMS rating, and a 2” high-temp voice coil, this small-frame subwoofer punches above its weight. A double-stacked ferrite motor, 5.5” progressive spiders and 10-gauge direct leads handle clean power transfer. Designed with a shallow mounting depth, it fits easily into doors and tight sealed applications without sacrificing output or control. 

The FXB Series 8” follows suit with a bit more throw and power. With a 17mm Xmax, 500W RMS rating, and the same double-stacked Y35 motor structure, it runs on a slightly larger 6.5” spider pack and 10-gauge direct leads. Still compact in depth, the FXB 8” is ideal for small ported or sealed enclosures where space is tight but impact matters.

The FXB Series 10” is where things get serious. Featuring a 30mm Xmax, this sub is rated for 1000W RMS and is built around a 3” 4-layer voice coil, the same coil used in our h

larger 12”–18” FXB subs. The motor remains a double-stacked ferrite design, and the suspension includes a full-size 8.8” progressive spider for added linear control. Finished with a cast aluminum basket and push terminals, the FXB 10” is one of the most capable budget 10s on the market. 

Every FXB subwoofer carries the Sky High Car Audio design language—blacked-out aesthetic, tooling for strength, and real-world durability. These aren’t stripped-down entry-level drivers—they’re the result of smart material choices and years of design refinement to bring maximum value to everyday builds. 

Box Designs: Sky High Car Audio is proud to partner with Hunter Martin from EZ DB’s, one of the most respected and proven enclosure designers in the industry. We’ll be offering FREE box designs—including ported, 4th order, and 6th order options where applicable—tailored specifically for our subwoofers to ensure maximum performance and reliability. As a bonus, any customer who purchases 4 or more BMX, FMX, or FXXL series subwoofers directly from Sky High Car Audio will receive a $50 credit toward a custom enclosure design from EZ DB’s, giving you a serious head start on a professionally designed, competition-ready subwoofer enclosure. Every SHCA subwoofer is tested using DATS-LA, measured with the backplate off the surface after full break-in, ensuring accurate and trustworthy TS data.

SHCA-FXB-6 Enclosure Designs

Note: The FE and FXB Series subwoofers are not customizable. For custom options including forged carbon fiber cones, additional spiders, glue packages, and colorful basket finishes, refer to our BMX, FMX, and FXXL lines.

Sky High Performance. Everyday Price.

Welcome to the Sky High Car Audio Revolution.