Psi stocks a number of 3.5 inch coils. Specifically the one used in DC audio level 5 and as u could guess it's much beafier than the w7 coil. Pretty sure they offer 4 and 8 layer. Also Springfield speaker. Lastly Google the coil replacement for dc audio level 5 15 inch sub parts. There's 2 or 3 other small dealers. Why bud? Lord of bass out of them? I've seen them on Amazon and eBay also.
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