I went through the exact same thought process about 2 months after I got the 3808. I thought for sure I must be missing it.

For $50 more than the $50 speaker switcher, you could get a fully functional Sherwood receiver with built in A/B switching. On the Sherwoods, you can even switch A to B via the remote control, so you wouldn't even have to get up to make the switch. ;\)

Epic 80-800: HG Cherry