A lot of folks have used a group of Radio Shack A/V switches to switch between DVD-A and SACD and reported no degradation. There is also the Sony TA-P9000ES that Merc and several others have used -- a 5.1 analog switching add-on to their TA-E9000ES pre/pro (which is discontinued but very, very popular on places like Audiogon and eBay). There is also this handy gadget -- a two-input 6-channel switch, with wired or IR remote control for the switchbox.

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gonk -- Saloon Links | Pre/Pro Comparison Chart | 950 Review