the aluminum coil can handle more power a little bit more hars sound than the copper one but great subs for SPL i have 2 HDC3 15's dual 2 alum im selling right now myself. they are the best sub as far as bang for buck in my opinion. good luck with the sale man.
the aluminum coil can handle more power a little bit more hars sound than the copper one but great subs for SPL i have 2 HDC3 15's dual 2 alum im selling right now myself. they are the best sub as far as bang for buck in my opinion. good luck with the sale man.