Slight thread hijack....an impedance regulating speaker switch? That's something I've never heard of before. If you select more than one pair of speakers, your receiver only sees one pair? How does it work? If they're wired in parallel, the impedance lowers, right? And if they're wired in series, the impedance increases, right? So does it drive multiple pairs of speakers but have the load of one pair? I have an embarrassingly basic knowledge of electronics, but I would love a dumbed down explanation of how this things works.