Description
Sundown Audio U-6.5SW D4
The Sundown Audio U-6.5SW D4 is a 6.5-inch shallow-mount subwoofer from the U Series, designed for compact installations where high-output, precise bass is required. Featuring a dual 4-ohm (D4) voice coil, it offers flexible wiring options for a variety of amplifier setups. Built with a high-temperature copper voice coil, reinforced cone, and durable foam surround, the U-6.5SW D4 delivers controlled low-frequency performance and long-term reliability. Optimized for sealed enclosures, this subwoofer is ideal for trucks, vans, and compact cars where space is limited but punchy, accurate bass is needed in a shallow-mount design.
Specifications
| RE (Ohms) | 4.0586 | 6.6274 |
| FS (Hz) | 41.9533 | 38.6925 |
| VAS (L) | 2.9053 | 3.7701 |
| Qes | 0.5238 | 0.5005 |
| Qms | 8.5834 | 7.2470 |
| Qts | 0.4937 | 0.4681 |
| Le (mH) | 4.0112 | 5.5892 |
| BL (NA) | 16.7428 | 20.0082 |
| Mms (Grams) | 137.2546 | 124.3518 |
| Cms (uM/N) | 104.8528 | 136.0613 |
| Sens (dB @ 1w/1m) | 77.8706 | 78.1460 |
| Xmax | 19mm | 19mm |
| T/S SPECS | U-6.5SW” D2 | U-6.5SW” D4 |
|---|
Enclosure Specifications
| Enclosure Type | Size (cu. ft. net) | Port Area (sq. in.) | Port Tuning (Hz) | Displacement (cu. ft.) | Depth (in) | Outside Diameter (in) | Cutout (in) |
|---|---|---|---|---|---|---|---|
| Ported Enclosure | 0.25 – 0.35 | 4 – 5 | 35 – 40 | – | – | – | – |
| Sealed Enclosure | 0.125 – 0.2 | – | – | 0.04 | 5.71 | 7.17 | 5.94 |
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