I have 1.2TL's and am considering bridging two 125 W Parasound amps, using one for each channel. This will give me about 300W for each channel. BUT, although DARQUENIGHT gave a great explanation of a common ground amp, I am confused about using two bridged amps. Maybe to achieve a common ground, I have to tie both chassis together? Help, please!! The last thing I want is to blow up my precious Polks. TIA.