612F-D4 - DD Audio Digital Designs 12" Dual 4-Ohm 3000W Subwoofer. The heat sink features beautifully carved, polished aluminum DD logos, and the motor is wrapped in a rubber boot with an all new embossed design.
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For JBL 12-inch Active Overweight Subwoofer Professional Cinema HiFi Subwoofer Sound SUB 260P/230-C
Aliexpress UK
SA-12 D4 CLASSIC - Sundown Audio 12" 750W Dual 4-Ohm SA Series Subwoofer. The SA line was designed to be the centerpiece of the Sundown Audio sub woofer lineup -- the line to which all of their other lines are compared.
eBay
Dual 2 ohm, 3" Voice Coils. 5,000 Watts Max Music Power. Proprietary Cooling Rings for Motor Assembly (Patented). Triple Stack Magnet.
eBay
512E-D4 - DD Audio Digital Designs 12" Dual 4-Ohm 2100W Subwoofer. Impedance: D2 / D4. The power handling increases to 500 Watts on the 508 and 750 Watts on 510, 512 and 515. DD Logo Basket. Speaker Size (In): 12.
eBay
Dual 4 ohm, 3" Voice Coils. 5,000 Watts Max Music Power. Proprietary Cooling Rings for Motor Assembly (Patented). Triple Stack Magnet.
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E-12 V.3 D4 - Sundown Audio 12" 500W RMS Dual 4-Ohm EV.3 Series Subwoofer. Working in conjunction with a motor ventilation system based on our SA series & the new, larger voice coil the third generation E series possesses thermal capacity unheard of in this class of subwoofer.
eBay
The SA line was designed to be the centerpiece of the Sundown Audio sub woofer lineup -- the line to which all of their other lines are compared. At Sundown Audio this still was not enough so they designed a highly optimized voice coil cooling system that ensures that an SA series woofer will never over-heat when used anywhere close to it's rated power level.
eBay
512E-D4 - DD Audio Digital Designs 12" Dual 4-Ohm 2100W Subwoofers. Impedance: D2 / D4. The power handling increases to 500 Watts on the 508 and 750 Watts on 510, 512 and 515. DD Logo Basket. High-temp Voice Coil.
eBay