I burned up two tweeters and a midrange driver breaking a pair of Thiel CS3.6's in while playing them out of phase and face-to-face. The crossover boards got so hot I could feel the heat right through the rear 1" MDF layer. So I say screw the quick and dirty method.
My advice, just be patient and use regular music playback.
My advice, just be patient and use regular music playback.