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RMS 400 watts
Dual 2 or 4 ohm voice coils
Optimized for small ported enclosures
Aluminum 1.75” voice coil former for superior heat dissipation
High-temperature copper voice coil
Double stitched surround
Heavy-duty cast basket
Spring-loaded terminals accept up to 8-gauge wire
Stitched-on heavy-duty tinsel leads
Solid pole with vent channels and aluminum shorting ring cap
Rear gap-venting
Top-Plate Cooling Channels
Perfect for high-power underseat enclosures and designed to be at home in the competition lanes or playing your favorite tunes, the U Series is the premier “standard suspension” woofer in the Sundown lineup. A double-stacked 9” wide ferrite magnet system is coupled to a thick top plate. A thick set of shorting rings are also used inside the magnets and on the pole cap, smoothing out frequency response while doubling as a heat sink and airflow guide. An all-new, substantially thicker custom aluminum frame was designed specifically for the U Series, and equipped with heat-dissipation ribs. The v.2 motor also features an extended pole piece to keep the coil controlled under high stress!
Specifications
T/S SPECS
U-6.5SW" D2
U-6.5SW" D4
RE (Ohms)
4.0586
6.6274
FS (Hz)
41.9533
38.6925
VAS (L)
2.9053
3.7701
Qes
0.5238
0.5005
Qms
8.5834
7.2470
Qts
0.4937
0.4681
Le (mH)
4.0112
5.5892
BL (NA)
16.7428
20.0082
Mms (Grams)
137.2546
124.3518
Cms (uM/N)
104.8528
136.0613
Sens (dB @ 1w/1m)
77.8706
78.1460
Enclosure Specifications
Ported Enclosure
Size: .25-.35 cu. ft. net
Port Area: 4-5 sq. in.
Port Tuning: 35hz -40hz
Sealed Enclosure
Size: 0.125-0.2 cu. ft. net
Displacement: .04 cu. ft.
Depth: 5.71"
Outside Diameter: 7.17"
Cutout: 5.94"
Physical Dimensions
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