SA-12 V.2 D4

The SA-12 V.2 is a 1250W RMS, 2500W peak 12-inch subwoofer and a top-down rework of the original SA platform. Its 2.75-inch coil matches what many 3-inch coils do without the extra moving mass, and the narrower coil makes room for a wider spider that keeps the cone stable at full travel. Mass, motor force, and suspension stiffness are balanced for this specific power level.

The motor carries a large magnet shorting ring to reduce distortion and keep response even across the acoustic band, plus a vented magnetic gap and pole piece for cooling. An aluminum 2.75-inch coil former moves heat out of the windings, and a cast aluminum vented frame spacer ring keeps air moving under the spider. High-temperature copper wire, a multi-layer spider, and doubled-up XL tinsel leads stitched to the cone handle the mechanical load.

A competition-grade paper cone, strong foam surround, and cast aluminum frame finish the build. Past roughly 19mm of one-way linear excursion, the mechanical limit is 37mm one-way before the coil bottoms.

Dual 4-ohm coils wire to 2 ohm or 8 ohm, the configuration for dual-woofer walls and amplifiers rated at a higher load. Target 1.75 cu ft ported with 26 sq in of port tuned to 35 Hz, or 1.0 cu ft sealed for a smaller footprint. Mounting takes 7.5 inches of depth behind an 11.01-inch cutout.