Sundown Audio SA-15 V.2 D4 15 Inch 1250W RMS DVC 4-Ohm Car Subwoofer with 2.75 Inch Coil, Faraday Ring, Cast Frame, Spring Terminals

The Sundown Audio SA-15 V.2 D4 is a 15 inch car audio subwoofer built as part of the SA V.2 series. It uses a dual 4 ohm voice coil design and is rated at 1250 watts RMS with 2500 watts peak power. The driver combines a 2.75 inch aluminum voice coil former, high temperature copper coil wire, spring loaded terminals, and a cast aluminum frame for a focused low frequency setup.

The motor and suspension are designed to balance moving mass, motor force, and stiffness for the intended power level. A vented magnetic gap and pole piece help airflow around the motor, while the aluminum coil former supports heat dissipation during demanding playback. The magnet ID Faraday ring helps reduce distortion and supports smoother acoustic response across the playback range.

This subwoofer fits custom car audio systems where a single 15 inch driver is being planned for strong bass output. It can be used with a 3.0 cu ft ported enclosure with 44 sq in port area and 35 Hz tuning, a 2.0 cu ft sealed enclosure, or a 4th order layout with a 1.5 cu ft sealed side and 4.5 cu ft ported side. Its 9 inch depth and 14.01 inch cutout help guide box planning.

The SA-15 V.2 D4 uses a competition grade paper cone with a strong foam surround for controlled cone movement. The multi layer spider works with fully tied on and doubled up XL tinsel leads to support the moving assembly under excursion. It provides 19 mm Xmax and an x mech limit of 37 mm one way before coil bottom, giving builders useful data for enclosure and power planning.

The vented cast aluminum frame spacer ring, spring loaded terminals, copper voice coil wire, and reinforced lead design support stable installation and repeated use. Listed measurements include 0.16 cu ft displacement, 9.68 inch motor diameter, 87.08 dB sensitivity, and 29.1578 BL. These details help match the subwoofer with the correct enclosure, amplifier setup, and vehicle space.