How to route audio between different "groups" of speakers
Search &quot;speaker switch box&quot; on Ebay
That was not hard
https://www.ebay.com/sch/i.html?_from=R40&amp;_trksid=p2334524.m570.l1313&amp;_nkw=speaker+switch+box&amp;_sacat=0&amp;LH_TitleDesc=0&amp;_osacat=0&amp;_odkw=speaker+switch