SML-12-D4 | Sundown Audio 12" D4 500W Shallow Subwoofer
FEATURES:

Xmax = 11mm one-way by 70% BL
Xmech is a hard limit of 25mm one-way for 12s and 20mm one-way for 10s
RMS Power = 500-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
Vented Pole-Piece and Multi-Vented Magnetic Gap
Dual-Magnet Design for appropriate motor force factor and mid QTS
Custom tooled cone shape for reduced mechanical noise over high excursion
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:

RE (Ohms) 3.650
FS (Hz) 34.932
VAS (L) 39.012
Qes 0.456
Qms 2.862
Qts 0.394
BL (NA) 17.879
Mms (Grams) 182.067
Cms (uM/N) 114.018
Sens (dB @ 1w/1m) 87.5dB
Enclosure Specifications:
Sealed Enclosure 0.75-1.0 ft^3
Ported Enclosure 1.25-1.75 ft^3
Recommended Tuning 35hz
Recommended Port Area
Mounting Depth 4.45”