Connecting 2 amplifiers to one set of speakers: making an amp/speakers selector switch | Audio-room
Premium 2 Zone Speaker Selector Switch Box, 2 Way Stereo Audio Speaker Switcher Distribution Box for Multi-Channel High Powered Amp A B Switches -SOLUPEAK SP2: Amazon.co.uk: Electronics & Photo
Simple design for a speaker switch that avoids shared ground | diyAudio
Multiple Amps to Single Pair of Speakers Selector - Source Gear / Other - HifiGuides Forums
2 way AMP Amplifier Speaker Selector Switch Audio Stereo Splitter Box Mini HIFI | eBay
Connecting 2 amplifiers to one set of speakers: making an amp/speakers selector switch | Audio-room