- 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
| 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 |
| Xmax |
19mm |
19mm |
| T/S SPECS |
U-6.5SW" D2 |
U-6.5SW" D4 |
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
