Speaker selectors come in different flavors depending on the size and scope of your whole house audio system. These speaker selectors are connected to a single “source” or high-current amplifier and borrow power from that source to drive multiple sets of speakers. Most single source speaker selectors drive two speakers in two, four and six zones; more than that and you’ll need to upgrade to a dual source selector because power can only go so far. Read the specs carefully before you buy. Speaker selectors are complex and include features like A/B switching that lets you turn sources on or off as well as impedance protection that helps a single amplifier divvy up power to multiple pairs of speakers without exasperating overload issues.
You need to choose options for your item to estimate shipping