Just to add, try the two speaker idea for the center channel but make sure the speakers are wired "in-phase" If they're not, it has no chance of working.

CG: Are you an adovcate of 6.1 or 7.1 surround sound? This issue of two center channels is exactly like taking a 6.1 system and making it a 7.1 system on most systems. You take a 6.1 system (mono rear surround) and split the signal to 7.1 (dual mono rear surrounds). IDareYa is just basically changing this from the back soundstage to the front soundstage.