EEEK
I could be wrong on this, but if you don't have both speakers hooked up to a passive crossover, doesn't that do funky things to the OHM load the amp sees? I think I read that in one of the tutorials that came with WinISD, but I could be very wrong
this is what I read in the WinISD tutorial, not sure it applies to you though
Notice that in each branch, the inductors and capacitors are in SERIES with each other (L1 is in series with C1, and C2 is in series with L2). In each branch, the inductor and capacitor are each chosen so as to offer 8 ohms of reactance at 1500 Hz. What this means is that at 1500 Hz, the cap is offering 8 ohms of capacitive reactance, and the inductor is offering 8 ohms of inductive reactance. Capacitive reactance and Inductive reactance are exact opposites, and cancel each other out! If you have 23 ohms of capacitive reactance, and 18 ohms of inductive reactance in a circuit, the net reactance is 5 ohms (the difference of the two). If the woofer or tweeter are removed from the circuit (become unplugged, or electrically "open" during play), then what you have is 8 ohms of capacitive reactance, and 8 ohms of inductive reactance in that branch. Since the two reactances cancel each other out, then the amplifier effectively sees a grand total of ZERO ohms at 1500 Hz! This will result in a damaged amp. Keep this in mind when considering implementing a 12 dB/Octave passive crossover into your system. Amps with built in short circuit protection will most likely survive this scenario, however...