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Location: Massena, New York, United States
Ships to: US,
Item: 195870616871
Condition:New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is … Read moreabout the conditionNew: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller’s listing for full details. See all condition definitionsopens in a new window or tab
Sundown Audio:Sundown Audio
Type:Subwoofer
Speaker Size:18in.
SDA-U-18:SDA-U-18
MPN:SDA-U-18
Warranty (Open Box Items):NO warranty by the manufacturer
UPC:Does not apply
eBay Sundown Audio – U v.2 18 U Series 18″ Subwoofer Dual 4 Ohm (Open Box) Sundown Audio – U-18 Standard Suspension U Series 18″ Subwoofer D2/D4 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. Available in Dual 2 or Dual 4 Ohm Voice Coils Features 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 Specifications U 18″ T/S SPECSU 18″ D2U 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 Enclosure Specifications U 18″ Sealed Enclosure 3.0 cu ft Ported Enclosure 4.0 cu ft Recommended Tuning 35Hz Recommended Port Area 64 sq in Displacement 0.26 cu ft Depth 10.11″ Outside Diameter 18.66″ Cut-Out 16.69″ Physical Dimensions Download Enclosure Designs Download Design .ZIP FILE Sundown Audio – U v.2 18 U Series 18″ Subwoofer Dual 4 Ohm (Open Box) Sundown Audio – U-18 Standard Suspension U Series 18″ Subwoofer D2/D4 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 uséd 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. Available in Dual 2 or Dual 4 Ohm Voice Coils Features 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 Specifications U 18″ 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 Enclosure Specifications U 18″ Sealed Enclosure 3.0 cu ft Ported Enclosure 4.0 cu ft Recommended Tuning 35Hz Recommended Port Area 64 sq in Displacement 0.26 cu ft Depth 10.11″ Outside Diameter 18.66″ Cut-Out 16.69″ Physical Dimensions Download Enclosure Designs Download Design .ZIP FILE × × × × × × × Buy now and save! Shipping info Click the Shipping & Payments tab above the listing description for more info FREE Shipping Click the Shipping & Payments tab above the listing description for more info! Additional delivery notes PICK UP OPTION Sorry, our items are NOT available for pick-up. PAYMENT Immediate payment is required upon selecting “Buy It Now” or upon checking out through the cart. We accept payment via U.S. PayPal accounts and all Major Credit Cards, Debit Cards & Google Pay. We are legally required to collect sales tax in those states and localities where we maintain a physical presence (nexus). The applicable amount of sales tax charged to an order will be calculated based on the shipment destination’s state and local sales tax laws. Thank you for shopping with us on eBay! Additional Information No additional information at this time Ask seller a question You might also like 240 amp S series alternator for Jeep 4.0 Late Billet Black 170 Amp Racing Alternator GM Truck LS Engine Swap S Series 240a Racing alternator for Honda / Acura V6 S Series 240 amp Alt for Rav4 3.5 Contact To contact our Customer Service Team, simply click the button here and our Customer Service team will be happy to assist. Ask seller a question © Alternator Outlet | Mechman High Output Alternators Authorized Dealer. Fast Ship Times, Made in the USA! Shipping & Payments Shipping is FREE for this item Payment Accepted Payment Methods Immediate payment is required upon selecting “Buy It Now” or upon checking out through the cart. We accept payment via U.S. PayPal accounts and all Major Credit Cards, Debit Cards & Google Pay. We are legally required to collect sales tax in those states and localities where we maintain a physical presence (nexus). The applicable amount of sales tax charged to an order will be calculated based on the shipment destination’s state and local sales tax laws. Thank you for shopping with us on eBay! Returns Returns are not accepted Buyer will pay for return shipping. eBay integration by
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