So I bought a Tantric HD 12 d2 a week ago and received it yesterday. Today I went to put it in my 2.5 cu enclosure and I am having a problem with the sound/voltage. It doesnt drop ( to maybe low 14s) and something is definitely wrong. I had a problem similar to this last week when I realized my coils on the mayhem were toast. Voltage drop with zv4 was to around 12 volts. The way it is playing seems as if it wired very high. What I did: -Checked coils on sub (read 2.4ohm each) -impedance at the output terminals is 1 ohm (car off) -o-scoped the rca's and output voltage (clean) - free aired the sub and notice no coil rub at all (seems as if not getting full power) and it sounds perfect - sub appears to be in mint condition - changed port tunings (didnt help) Only thing I can think of left: - check power/ground input (dont think this is going to do anything) I really need some help guys been out of bass for 2 weeks and cant figure this problem out.