This forum has been great about answering technical questions so here's another one... Ok, lets say I have a 15 inch speaker that has a sensitivity of 100 dB at 1w/1m and a 500w @ 4 ohm amp. That gives me 126.9 dB. I understand that if 2 speakers should be 3 dB louder than 1, but how does wiring of a single 2 speaker cabinet figure into this. In other words, If I wire 2 8 ohm 15's in parallel to achieve a 4 ohm load is the cabinet going to be 3 db louder (129.9 dB) than a single 4 ohm 15 at the available 500 w? Does wiring the cab in parallel mean that each speaker is getting half the wattage that the amp is putting out, or is each speaker getting the full 500w? Now, how does series figure in? Would two 4 ohm 15s in series be louder that 1 8 ohm 15?