Tried running my sub parallel (positive to negative on each coil and then another wire for one side positive and one side negative which connects to the amp) and no sound at all came out, normally I run it in series (positive to positve, negative to negative) and it works fine, checked the coils after install and they were connected fine, ended up hooking it back up in series and it pumped out sound again, the owners manual to the MOFO recommended running it in series or parrallel and gave similar directions in doing so, just wondering why it didn't put out any sound at all, any advice would be appreciated.