We start with a double-stacked / 8.66Ó wide Y35 grade ferrite magnet system coupled to a one-piece, bumped T-Yoke and a 0.6Ó 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 0.6Ó long pole-extension to keep the coil under control at high levels of excursion.
The voice coil is a 2.36Ó long / 3Ó diameter 4-layer aluminum winding / aluminum former unit Ð 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 powerÉ 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.
* Heavily vented magnetic gap
* Optimized high-velocity pole vent
* Innovative high-velocity vented frame spacer ring
Black Aluminum 3Ó 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 enclosuresÓ
Features & Technology:
Size: 46 cm / 18 inch
Power: 1500 watt RMS
Impedance: 2×4 ohm