Sundown Audio SA-15 D2 15 Dual 2-Ohm Subwoofer

The speaker driver has an RE (electrical resistance) of 4.61 ohms, a fundamental resonance frequency (FS) of 34.88 Hz, and a volume of air which has the same acoustic compliance as the driver's suspension (Vas) of 54.69 liters. The total quality factor (Qts) is 0.65, with an electrical quality factor (Qes) of 0.72 and a mechanical quality factor (Qms) of 6.52. The voice coil inductance (Le) is 3.39 mH, and the force factor (BL) is 21.76 N/A. The moving mass (Mms) is 338 grams, and the suspension compliance (Cms) is 61.42 μm/N. The sensitivity (Sens) is 86.81 dB (1W/1m).

The cutout diameter of the driver is 14 1/8 inches, with a mounting depth of 7 1/2 inches and an overall diameter (including the gasket) of 15 5/8 inches. The displacement of the driver is 0.17 cubic feet.

The driver is capable of handling an RMS power of 600 watts. The recommended enclosure specifications for a sealed box are 2.5 cubic feet, which yields a 3 dB cutoff frequency (F3) of 41 Hz. For a ported enclosure, the recommended volume is 3.5 cubic feet, tuned to 35 Hz, which provides an F3 of 28 Hz.

The driver features a maximum one-way X-max of 19.0 mm, or 38.0 mm peak-to-peak, as measured using the 70% BL method. The voice coil formers are made of thick, black anodized aluminum for maximum strength and heat dissipation. The 4-layer copper voice coil windings have a 45 mm winding length and are capable of high-temperature operation.

The spider is a double-layer, permanently bonded, high-strength Nomex design for maximum longevity and durability. The tinsel lead wires are securely tied down to the spider to prevent noise and breakage. The frame features a custom-tooled triple joint support ring and a custom-tooled frame spacer/ventilation ring. The motor design incorporates high-efficiency air-flow management for maximum voice coil cooling, and dual aluminum Faraday rings to reduce inductance and inductive distortion.

The speaker driver is covered by a two-year warranty against defects in materials and workmanship.

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