I've seen some selector switches for audio/video connections that offered remotes, but I don't know about speaker selectors. My usual sources (Radio Shack, HomeTech, SmartHome) didn't turn anything up except for a few in-wall speaker selectors (like
these two ). Others around here may have some good suggestions, though.
Outlaw's amps won't be hurt any by operating at 4 ohms. You could do something like a speaker selector box with impedance matching to produce an 8 ohm load, but these amps are designed to operate with very demanding 4 ohm speakers (such as Polk's LSi series) without any ill effect. This assumes, of course, that we're talking about an Outlaw amp or a comparable amp from some other manufacturer.