Product: Sundown Audio U-15 D2 15" 1500W RMS Dual 2-Ohm U-Series Subwoofer
Brand: Sundown Audio
Finalized terminal spacing, basket color, venting, cast aluminum surround clamp rings, etc. After about a year of work I think the U series maybe ready to start production soon. Stay tuned for more updates! This will be our new series to bridge the gap from the SA to the X v.2 series -- it is also the most direct replacement for the discontinued Z v.3 series but at a much lower price. They use the same voice coil as the X v.2 series; therefore RMS power is 1500-watts rated conservatively. The motor is a similar design to the X v.2 series with one less magnet slug since it isn't needed for use on these frames & soft parts. It also retains a magnet ID shorting ring just like the X v.2 series motor. I have tooled 4 new cone bodies & surrounds to mate up to an entirely different frame tooling from the 1st prototypes. These surrounds are based on the Z v.3 18" surround geometry as this has been our go-to cone for SPL (we use those cones in our Terra for our World Record in SS 3-4 class). We also have tooled the cones to support the same wide-flange dust caps we use on all the new platform drivers. They also feature custom tooled cast aluminum vent spacers to mate up correctly to these frames. We tooled 2 different spacers for this line. Another new feature (also fully custom tooled) is the cast aluminum surround bolt-on ring. We tooled one for each size U series. These woofers will have a similar sound to the Z v.3 series -- meaning they do not have the "new platform" sound of the X, Z, NS, etc.
Sundown Audio U-15 D2 15" 1500W RMS Dual 2-Ohm U-Series Subwoofer
Specifications: DC Resistance (Re): 3.8 Ω | Resonance Frequency (Fs): 37.9 Hz | Equivalent Volume (Vas): 54.0 L | Electrical Q Factor (Qes): 0.34 | Mechanical Q Factor (Qms): 3.10 | Total Q Factor (Qts): 0.31 | Voice Coil Inductance (Le): 2.44 mH | Force Factor (BL): 30.7 NA | Moving Mass (incl. Air Load) (Mms): 355.7 g | Suspension Compliance (Cms): 0.05 mm/N | Sensitivity: 91.2 dB 1w / 1m
Box Recommendations: Sealed Enclosure Suggestion: 2.0 cu. ft. | Ported Enclosure Suggestion: 3.0 cu. ft. | Displacement: 0.24 cu. ft. | Depth: 9.05 in | Outside Diameter: 15.59 in | Cutout: 14.01 in | Recommended Tuning: 32 Hz | Recommended Port Area: 48 sq. in.

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