Sundown SD-3 D2/D4 10” Subwoofer

The SD-3 series is our premier sealed box offering. We started off this design knowing that the majority of sealed box applications today face a depth restriction so each SD-3 model was designed to have the lowest depth possible while still maintaining a large window of mechanical cushion. We do not consider the SD-3 an “ultra-shallow” but they are as shallow as possible and feature several techniques to reduce the effective depth required. 

First of all they have a completely solid pole and, thus, require no room for air venting behind the motor. This allows the motor to be completely flush against the back wall of the enclosure. Secondly the entire SD-3 series features an inverted rubber surround – this reduces the space required in front of the woofer to about 1” total. So, despite not being an “ultra-shallow” woofer they have an effective total depth requirement of about 2” less than most traditional woofers of an equal depth. 

The parameter set has been optimized for very small sealed enclosures for this line. While they can operate in ported boxes these woofers feature a very soft suspension so will not tolerate high levels of abuse in large, ported enclosures.


Features & Technology: 

  • Xmax = 14.5mm one-way by 70% BL
  • RMS Power = 500-watts
  • Under-Hung low distortion motor topology
  • Solid pole piece with chamfered edges
  • Black Aluminum 2.5” voice coil former for superior heat dissipation
  • High Temperature 8-Layer copper voice coil wire
  • Large aluminum faraday ring (Magnet ID)
  • Spring Loaded Terminals
  • Stitched-On Tinsel Lead Wires
  • Optimized for small sealed enclosures
  • Inverted Rubber Surround to reduce front-mount depth
  • High strength cast aluminum frames


Sundown SD-3 Subwoofer specs: 

  • Speaker Size = 10" D2/D4
  • Nominal Impedance = 3.72/7.0 ohm
  • Rated RMS power handling = 500 W
  • Sensitivity = 82.9/83.1 dB
  • Fs = 25.7/25.5 Hz
  • Qes = 0.49/0.50
  • Qms = 3.12/3.53
  • Qts  = 0.42/0.43
  • Cms = 230/260 uM/N
  • Mms = 165/152 g
  • BL = 14.28/18.57 NA
  • Vas = 35.5/39.3 L
  • Mounting depth = 4 3/4”
  • Outside diameter = 8 3/8”
  • Cutout diameter = 7 3/8”
  • Displacement (sealed) = 0.4ft3
  • Displacement (ported) = 0.5 – 0.75ft3
Sundown SD-3 D2/D4 10” Subwoofer
  • Item #: sundown sd-3 10
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Price $250.00
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