Sundown Audio 10" U series dual 2 ohm

The Sundown U Series is our premier “standard suspension” woofer series. The all-new U v.2 improves on the already incredible performance of its predecessor.

We start with a double-stacked / 9.44” wide Y35 grade ferrite magnet system (3/4” wider than the v.1) coupled to a one-piece, bumped T-Yoke and a 0.6” thick top-plate. Just as with 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 v.2 adds a pole-cap aluminum shorting ring which doubles as a heat-sink and airflow guide. The U v.2 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 design from the U v.1 – but the new version is built with a stronger aluminum former. The coil temperature is kept in check via a high-velocity solid pole / machined pole channels arrangement and a series of 16 direct air-gap vents in the back plate. The U v.2 series also features custom 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 v.2 series features an all-new, custom tooled, cast aluminum frame designed specifically for this line. The cosmetics are very similar to the original v.1 frames but every size frame is substantially thicker and even features stiffening / heat dissipation ribs around the bottom part of the frame. The new frame design allows for significantly taller cones and wider spiders on the 10s and 12s compared to the v.1 which greatly enhance mechanical clearances. Moving on to the 15 the spider is also wider than the originals. The 18 uses the same spider and cone height as the originals but the frame is, of course, much stronger.

Given the stronger motor (15% more powerful), stronger coil construction, superior motor air-flow characteristics, and enhanced mechanical capacity we boosted the power rating to 1750-watts RMS from the 1500-watt rating of the previous version.

If you are looking for a woofer that sounds similar to the SA series but handles significantly more power… the U v.2 series is exactly what you need. It has been designed to live up to the reputation earned by our U v.1 series both in terms of every-day music enjoyment and SPL competition.

FEATURES

Black Aluminum 3” voice coil former for superior heat dissipation

High Temperature Round-Wire ALU voice coil with high-temp black adhesive

Double stitched surround

Heavy duty cast baskets – all new, custom-tooled

Spring loaded terminals accept up to 8 gauge

Stitched-on double-XL tinsel leads

Solid pole with vent channels and aluminum shorting ring cap

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

SPECIFICATIONS

T/S SPECS UV.2 10" D2 UV.2 10" D4

RE (Ohms) 3.918 6.1962

FS (Hz) 49.9826 48.2463

VAS (L) 5.6312 6.1900

Qes 0.5327 0.6317

Qms 4.4138 4.5611

Qts 0.4753 0.5548

Le (mH) 3.1056 4.1634

BL (NA) 26.5116 29.7199

Mms (Grams) 304.2236 297.0392

Cms (uM/N) 33.3280 36.6351

Sens (dB @ 1w/1m) 82.9533 

82.1635

ENCLOSURE SPECIFICATIONS

Sealed Enclosure 0.5 cu ft

Ported Enclosure 1.0 cu ft

Recommended Tuning 35Hz

Recommended Port Area 16 sq in

Displacement 0.21 cu ft

Depth 8.15″

Outside Diameter 11″

Cut-Out 9.75″