if you set your sub in series for an 8 ohm load and then bridge the amp, the amp sees an 8 ohm load, not 4 ohms per side. the sides arent cumulative as in 4 ohm s+ 4 ohms = 8 ohms. its just plain 8 ohms. the amp either feeds 4 ohms or 8 ohms, it doesnt split it up. the amps power flows from the...