The Sundown U Series is our premier “standard suspension” woofer series. It is the most direct replacement for the world famous Z v.3 woofer line which we produced from 2011 to 2016 before launching the “new platform” Z v.4 series. Due to numerous advancements in our design process the U Series is able to deliver performance on-par with the Z v.3 series but at a much lower cost.
We start with a double-stacked / 8.66” wide Y35 grade ferrite magnet system coupled to a one-piece, bumped T-Yoke and a 0.6” thick top-plate. Just as with the Z v.3 before it and our other high-end subwoofers we also add a very thick (5mm thickness) aluminum shorting ring inside the magnets to reduce static inductance and level out inductance over stroke. The U series motor also features a 0.6” long pole-extension to keep the coil under control at high levels of excursion.
The voice coil is a 2.36” long / 3” diameter 4-layer aluminum winding / aluminum former unit – which is the same coil we use in our X v.2 series and, thus, the U series has the same 1500-watt RMS ratings. The coil temperature is kept in check by a heavily smoothed / high-velocity pole-vent and a series of ten direct air-gap vents in the back plate. The U series also features newly tooled cast aluminum vent rings in between the frame and top plate to effectively exchange air at a high velocity over the voice coil beneath the spider landing.
The U series features an all-new cast aluminum frame series to the Sundown line which allows for taller cones than the older frames used on the Z v.3 series. The taller cones provide enhanced coil stability and increased mechanical excursion capability. We also tooled matching cast-aluminum surround clamps for the U series to ensure durability in the most demanding situations. The surrounds and cone bodies have been fully custom tooled especially for the U series and are stronger / support more excursion than the Z v.3 series cones and surrounds. The new cone bodies also feature an indentation for the same wide-flange, ultra-strong dust caps as our new platform subwoofers.
If you are looking for a woofer that sounds similar to the SA series but handles significantly more power… the U series is exactly what you need. It has been designed to live up to the reputation earned by our Z v.3 series both in terms of every-day music enjoyment and SPL competition.
| T/S SPECS | U 12″ D2 | U 12″ D4 |
| RE (Ohms) | 3.8 | 6.1 |
| FS (Hz) | 42.2 | 40.0 |
| VAS (L) | 17.9 | 12.3 |
| Qes | 0.30 | 0.38 |
| Qms | 2.67 | 2.93 |
| Qts | 0.27 | 0.34 |
| Le (mH) | 2.41 | 3.67 |
| BL (NA) | 31.2 | 33.7 |
| Mms (Grams) | 290.2 | 284.5 |
| Cms (uM/N) | 0.05 | 0.06 |
| Sens (dB @ 1w/1m) | 88.4db | 85.0db |
| Sealed Enclosure | 1.0 cu ft |
| Ported Enclosure | 2.0 cu ft |
| Recommended Tuning | 32Hz |
| Recommended Port Area | 32 sq in |
| Displacement | 0.21 cu ft |
| Depth | 7.75″ |
| Outside Diameter | 12.83″ |
| Cut-Out | 11.01″ |
Sundown Audio
Sundown Audio
Sundown Audio
Sundown Audio
Heard so much about the u12 had sas when I originally started buying sundown and loved them currently also have a nsv3 which I love but wanted an alternate sub that excels in most frequencies with a traditional sound this is only day one but I can tell the u wont disappoint! Shout out to audio apex for great customer service as well as fast shipping and great payment plans !
