Amp rated 300 watts into 4 ohms (it is a one channel amp). Using 6 bass shakers rated at 50 watts each @ 4 ohms, am I OK running the following series/parallel scheme? Running 4 shakers in series (back row) and running another two in series in the front row. The two series setups would be connected in parallel to the amp. I am pretty sure this delivers 16 ohms to the back and 2 ohms to the front, but when set in parallel, this would deliver an effective 8 ohm load on the amp, is this correct? Would this also deliver proper wattage to the shakers?