Who makes switch-box for balance inputs?

Ncwogger, Like I said back to back switching with switch on and without did not changed sound drastically. But you can tell direct connection without switch was slightly/very slightly better.

Kramer Electronics makes different switches- multiple balanced and unbalanced. I bought one model with 4 balanced inputs and one out with switches and all internal wiring changed to Acoustic Zen silver ref to match my ics. Honestly I can tell the difference in sound with or without it in the signal path. Look up in web for link. You may want to talk to Larry at Garret (distributor) 425-939-7970 for your need for easy model find.