Sundown Audio U-18 D4 18 Sub 1500w Rms Dual 4-ohm Subwoofer Bass Speaker New

U-18 D4 - Sundown Audio 18 Dual 4-Ohm 1500W RMS U-Series Subwoofer. 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. 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. DC Resistance (Re): 6.1? Resonance Frequency (Fs): 31.4 Hz. Equivalent Volume (Vas): 135.4 L.

Electrical Q Factor (Qes): 0.42. Mechanical Q Factor (Qms): 3.55.

Total Q Factor (Qts): 0.38. Voice Coil Inductance (Le): 3.97 mH. Force Factor (BL): 35.3 NA. Air Load (Mms): 441.3 g. Suspension Compliance (Cms): 0.06 mm/N. Sensitivity: 91.8 dB 1w / 1m. Outside Diameter: 18.66 in. Cutout Diameter: 16.69 in. Recommended Port Area: 64 sq. In order to maintain an inventory of 100%, Brand New, A-Stock, untouched products, all sales are final. We ask that you please be sure you are ordering the correct product.