I'm going to run a dual 4 ohm voice coil subwoofer with my Proton D1200 amp, and I happens to have the earlier version with the bridging switch. I can either run the amp in stereo with each channel connected to each coil, OR I can wire the sub's coil in series to give me 8 ohms and bridge the amp. Which way is better? I'm currently running the amp in bridged mode to a single 8 ohm sub, but I just blew it the other day