Sundown Audio U-Series 18" 1500W Subwoofer/Sub U18
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U Series 1500W DVC Subwoofer
The Sundown U Series v.2 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.
- Black Aluminum 3” voice coil former for superior heat dissipation
- High Temperature Round-Wire CCAW voice coil with high-temp black adhesive
- Double stitched surround
- Heavy duty cast basket
- Spring loaded terminals accept up to 8 gauge
- Stitched-on double-XL tinsel leads
- Rear vented pole piece
- Rear drilled gap-venting
- Innovative high-velocity cast aluminum vented frame spacer ring
- Magnet ID shorting ring
- Top-Plate Cooling Channels
- Cast Aluminum surround bolt-on rings
- Optimized for small ported or bandpass enclosures
T/S SPECS U 18" D2 U 18" D4 RE (Ohms) 3.8 6.1 FS (Hz) 31.3 31.4 VAS (L) 135.4 135.4 Qes 0.37 0.42 Qms 3.41 3.55 Qts 0.33 0.38 Le (mH) 2.62 3.97 BL (NA) 29.9 35.3 Mms (Grams) 444.1 441.3 Cms (uM/N) 0.06 0.06 Sens (dB @ 1w/1m) 92.3db 91.8db