Sharing Speakers between two amps

I have recently built an analog system and am seeking a solution for sharing speakers with a surround sound system for the occasional movie night. I purchased a switch box but noted that it has resistors across the poles, apparently to protect the amps, and am concerned about their affect on the audio and have therefore chosen not to use it. I understand that using any switch requires careful operation with both amps off etc. Thinking about building my own switch assembly with properly sized components and wires etc. Would appreciate any suggestions or precautions. Really trying to avoid buying a 2nd set of speakers. (Rogue Cronus Amp and Denon Receiver)
Thank you.