Hi all, I have a problem here. Due to the amount of subs I have (two Tempests or 4 Cerwin Vegas), if I wire the subs using both coils, I end up with a 2 or 8 ohm load. And I'm using a PE 300-794 amp, so neither one is a good choice (I think). I've been reading a bit about short-circuiting one of the coils, so that I end up using just one of them on each sub. That way, the total system impedance is 4 ohms. There is a rather strong variation on Qes (by a factor of two) and Qes (which drops drastically on the Tempest). Qts stays the same, though! (I think this might be a typo on http://www.adireaudio.com/Files/TempestWhitePaper.PDF, and Qes equals the other cases' Qes). SPL drops by a factor of 3 dB (which I think should be expected, since you are basically losing one voice coil). The installation will be done on an IB. My options are: a) Lose those 3dB in sensitivity and short circuit a coil. This lack of power won't be made up by the extra 70 or so watts the amp produces in 4 ohm mode. b) Wire everything so that total impedance is 8 ohms, and lose the 70 watts of extra power. c) Wire everything so that total impedance is 2 ohms, and hope the amp doesn't fry. Which one do you think would be the best option? I think I could get away with a 2 ohm configuration if the amp is properly ventilated. Then again, I would be willing to use an 8 ohm mode if there is no other option. It would seem to me short circuiting one of the coils would mean having two add twice the drivers for the same SPL level. Thanks for your help!