SML-8 D4

The SML-8 D4 is a shallow-mount 8-inch subwoofer rated at 400W RMS and 800W peak, built for installs where depth decides what you can run. Mounting depth is 3.9" with a 7.65" cutout, roughly an inch shallower than the SLD line while giving up very little excursion, so it fits under a bench seat, behind a rear seat, or in a slim false floor and still moves air.

Travel is rated at 14mm Xmax. A black aluminum 2.25" voice coil former pulls heat away from the windings, and high-temperature 4-layer copper voice coil wire holds up through long stretches at rated power. Stitched-on Mini-XL tinsel leads resist the lead fatigue that ends a lot of high-excursion woofers, while a vented pole piece and vented magnetic gap keep air moving through the motor. A dual-magnet design gives even acoustic response, the custom-tooled cone shape cuts mechanical noise at high excursion, and bolt-through motor construction holds the assembly square under hard use.

Small boxes are where this woofer earns its place: a 0.33-0.5 cu ft sealed enclosure. Recommended fourth-order figures are published as well: a 0.375 cu ft sealed side with a 1.5 cu ft ported side, 12 sq in of port area, and a 6" port length.

The dual 4-ohm coils can be wired to a 2-ohm or 8-ohm load, so it pairs with a wide range of mono amplifiers in a truck, sedan, or SUV where a full-depth 8 will not physically fit.