Ive got a set of 2ch speakers that need to be controlled by 2 different amps at different times.

To do this im looking for an amp selector with either relay or IP or RS232 control so that i can switch between the amps from the control system. I dont really want to use a device that has "auto sensing" on the inputs as from experience these have not been great, i would like a physical command to be able to switch between the amps.

I used to use a Niles audio product for this but it seems they have discontinued it.

Any suggestions of other models ?