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 12″ D2 |
SLD 12″ D4 |
| RE (Ohms) |
3.65 |
6.85 |
| FS (Hz) |
42.959 |
45.142 |
| VAS (L) |
26.889 |
29.481 |
| Qes |
0.691 |
0.619 |
| Qms |
2.227 |
2.298 |
| Qts |
0.415 |
0.487 |
| Le (mH) |
|
|
| BL (NA) |
19.868 |
23.025 |
| Mms (Grams) |
204.319 |
168.773 |
| Cms (uM/N) |
67.177 |
73.652 |
| Sens (dB @ 1w/1m) |
88.1 |
88.3 |
Enclosure Specifications
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| Sealed Enclosure |
1.0 cu ft |
| Ported Enclosure |
1.5 cu ft |
| Recommended Tuning |
35Hz |
| Recommended Port Area |
26 sq in |
| Displacement |
|
| Depth |
5.45″ |
| Outside Diameter |
12.625″ |
| Cut-Out |
11.125″ |
