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.
Features & Technology
Xmax = 30mm one-way by 70% BL
RMS Power = 1500-watts
Heavily vented magnetic gap
Optimized high-velocity pole vent
Innovative high-velocity vented frame spacer ring
Black Aluminum 3 voice coil former for superior heat dissipation
High Temperature 4-Layer Round Wire Coil
Large aluminum Faraday Ring (Magnet ID)Spring Loaded Terminals
Stitched-On Double-XL Tinsel Leads to prevent fatigue and failure
Bolted-On 100% Nomex Spiders
High-Strength Cast Aluminum Frame
Optimized for small ported & band-pass enclosures
RE (ohms) 3.8
FS (Hz) 42.2
Vas (L) 17.9
Le (mH) 2.41
BL (NA) 31.2
Mms (Grams) 290.2Cms (uM/N) 0.05Sens (1w/1m) 88.4db