Randy,

The tech guy at Axiom built one for me, so I'm not up on where you'd find a commercial unit. I'm sure they're available. On my switcher, the adjustment for different speaker sensitivities has a limited range, but enough for the differences in Axiom models and some other brands I have kicking around for comparison purposes. Mine will only accommodate two pairs of speakers-- "A" and "B."

Alan

Alan Lofft,
Axiom Resident Expert (Retired)