As previously said, you can burn the output transformers.
I also have two amplifiers and two sets of speakers. I made a switch box that allows me to choose which amplifier am I listening to, connected to which speakers. There are some models on the market (selectores and switches), but I decided to build my own and I'm very happy with it.
I also have two amplifiers and two sets of speakers. I made a switch box that allows me to choose which amplifier am I listening to, connected to which speakers. There are some models on the market (selectores and switches), but I decided to build my own and I'm very happy with it.