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SLD Series 600W DVC Subwoofer

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.


  • 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

    SLD 12"

    T/S SPECSSLD 12″ D2SLD 12″ D4
    RE (Ohms)3.656.85
    FS (Hz)42.95945.142
    VAS (L)26.88929.481
    Le (mH)  
    BL (NA)19.86823.025
    Mms (Grams)204.319168.773
    Cms (uM/N)67.17773.652
    Sens (dB @ 1w/1m)88.188.3


    SLD 12"

    Sealed Enclosure1.0 cu ft
    Ported Enclosure1.5 cu ft
    Recommended Tuning35Hz
    Recommended Port Area26 sq in
    Outside Diameter12.625″

Sundown Audio SLD 12" 600 Watt Shallow Subwoofer D2/D4

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