I have a Euro Spector LX4 I have stock active EMG P/J pickups and I have installed an EMG BQC control preamp at 9 volts. The only mod I have done is an active passive switch. The issue I have is when I turn the treble knob all the way down at the end I get that loud whomp and all signal cuts out and it sends a huge signal through the amp almost pushing the cones out of the baskets. I did replace the stacked treble/bass pot 3 times all doing the same exact thing. I used standard 50x2 tone pot just like the original one. The only thing different is the active passive switch. I un grounded the switch to see if it was a ground loop there and it still did the same thing only then there was as to be expected a loud pop when switching. Should I lose the switch? I like having it and now there is a hole for it. I even wired up a kill switch instead and it did the same thing with all three stacked pots. Only thing I havent done and maybe the only solution is to leave the switch in and just disconnect it completely. Any suggestions?