The Sundown SLD series can be considered a “re-boot” of the SD-2 line from 2011. The SD-2 was essentially a “shallow SA v1” by design – meaning it shared the cone, surround, and spider with the SA but with a shorter motor with a shorter coil. The SD series went another route starting with the 3rd generation (SD-3) – tilting more towards SQ and sealed enclosures (this remains true for the SD-4 series as well). Due to popular demand we created the SLD series to add a heavily abuse tolerant “shallow” that likes ported boxes back into the line-up!
Much like the current SD-4 series we utilized solid pole-piece so the SLD can also be mounted directly against the rear enclosure wall to reduce net depth requirements. Compared to the old SD-2 we have introduced numerous important upgrades: pole-piece channels for reduced air noise & increased cooling, top-plate “slits” for better cooling and less distortion, and a magnet ID shorting ring. In terms of long-term reliability we have also bolted down the spider, bolted the motor together, bolted on the aluminum pole cap, and added “mini-XL” lead wires thus ensuring many years of flawless service.
The bottom line is if you need a relatively shallow woofer that will take a beating then the SLD is, hands-down, the woofer for you from our line. If you are looking for more SQ then look toward the SD-4 series.
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Features
- Xmax = 12mm one-way by 70% BL
- Xmech is a hard limit of 25mm one-way (being over 2x the Xmax it is a very generous limit)
- RMS Power = 600-watts
- Black Aluminum 2.5” voice coil former for superior heat dissipation
- High Temperature 4-Layer copper voice coil wire
- Stitched-On “Mini-XL” Tinsel Leads to prevent fatigue and failure
- Solid Pole with high velocity vent channels machined around the OD
- Vented, EMD Cut, Top-Plate Design
- Bolt-through motor design to ensure maximum longevity and ruggedness against mechanical failures
** This motor is bolted through the top so the bolts are not visible from the back like several other models.
- Magnet ID shorting ring
Specifications
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| T/S SPECS |
SLD 10″ D2 |
SLD 10″ D4 |
| RE (Ohms) |
3.65 |
6.85 |
| FS (Hz) |
44.907 |
46.817 |
| VAS (L) |
14.630 |
12.091 |
| Qes |
0.452 |
0.547 |
| Qms |
2.212 |
2.246 |
| Qts |
0.376 |
0.440 |
| Le (mH) |
|
|
| BL (NA) |
18.247 |
24.492 |
| Mms (Grams) |
146.252 |
162.818 |
| Cms (uM/N) |
85.883 |
70.979 |
| Sens (dB @ 1w/1m) |
86.5 |
85.4 |
Enclosure Specifications
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| Sealed Enclosure |
0.5 cu ft |
| Ported Enclosure |
1.0 cu ft |
| Recommended Tuning |
35Hz |
| Recommended Port Area |
15 sq in |
| Displacement |
|
| Depth |
4.9" |
| Outside Diameter |
10.5″ |
| Cut-Out |
9.25″ |
