way overkill - but this thing works and it is quite a truth teller!
https://avahifi.com/products/abx-switch-comparator
iirc niles made a line of regular speaker selectors... ok, not great fidelity but did the job safely
https://avahifi.com/products/abx-switch-comparator
iirc niles made a line of regular speaker selectors... ok, not great fidelity but did the job safely