with that being said... do not put the combined RMS of both coils on one.
a lot of people use one voice coil and then do various other things to the second (leave it open, short it) to change the QTS of the sub. This was the idea behind the AA sub (the model slips my mind)... it was nothing new, just a little different spin on the idea
A common misconception with regard to dual voice coil speakers is the assumption that nothing changes if you power only one of the voice coils. With only one coil hooked up, a dual voice coil speaker will suffer a loss in reference efficiency of about 3dB (only half the coil windings are being energized) as well as a significant shift in its Thiele/Small parameters. This renders any enclosure calculations inaccurate unless you remeasure the speakers parameters with only one coil hooked up. Failure to account for the different parameters of a dual voice coil speaker with only one coil powered can result in very poor performance.
hmm this thread made me wonder if i wired my arsenal wrong. i have the speaker wire hooked up to the right terminal and nothing hooked up to the left one. the sub is 2 ohms and the amp is putting out 750w at 2 ohms. is my sub hooked up right?
correct, you should wire it like in the top right picture. then you would have the vc's in parallel and give you a single 2 ohm load for that amp. you should be pleased with the results when done, if you havent already messed up the driver from only having one voice coil hooked up.
thanx for the help and im glad i read this thread before i did do some damage to it. glad i havnt been playing it that long or that much. just out of curiosity what ohm load would my amp have been seeing with the sub hooked up that way?