best single 15 for my setup? 4cubic foot box ported at 32 hz, 2007 ford focus hatch

if you give me 350 ill build you a custom sub based off a HD3 motor. only decent part on the HD3. i can build you something to suit you box cabin/preferences.

right off the back i could get a 64mm flatwound alums bifilarcoil that would work well with 4 medium 8" progressive spiders. and direct connect leads.. heavy duty cone with large roll surround. guaranteed to out preform the HDC3 original version and sound better doing it..

 
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