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 ?

So... you want either one amp or the other to drive this pair of speakers, right?

The current levels involved in power amplifier outputs will require your amplifier choice to be made by a relay.

About the only major flaw I've run into with autosensing units comes from misunderstanding how all the parts work.

Let's say you have a pair of speakers in the ceiling, and you want them to sometimes run off of a house multiroom system, and sometimes you want them to run off the amplifier in the TV.

This has worked poorly when it was set up so that turning the TV on would switch the speakers to connect to the TV. You see, since the TV is not played all that loud, it wasn't very good at staying on, especially on a bedroom TV at night.

The same setup works GREAT, though, if you make the house system select which amp the speakers are connected to. The house amp signal will usually be larger than the TV amp signal, so it's way less likely for the house amp to drop out than for the TV amp to drop out.

Otherwise, Xantech might still have an IR-controlled relay, the CC12. (If you're controlling more than two things, the CC62 is an economical choice -- it has six relays.)

I know the Niles piece you mention is officially discontinued, but somehow have still been able to get them every once in a while.
Control system relay + 12vdc power supply + this 4PDT Ice Cube Relay + the Relay base might work for you.

Search for the Niles AB8.
1 Amp to 2 sets of 8 speakers
or
2 amps to 1 set of 8 speakers
NC/NO to trigger.

I have a couple of Xantech CC-12 with power supplys I would let go of cheap. PM me if interested.

You could also get two of these.

[Link: metrahometheater.com]

This has a double throw relay that is code learning.
Send "Red" output from one amp into "A" port, the "Red" output from other amp into "B" port and then Common to speaker. Tie the "Blacks" together.

I would be reluctant to connect speakers to a 2A relay. Tying blacks together on a bridged amplifier, such as Sonos CONNECT:AMP, will cause trouble.

One could key a separate relay. Just be sure that the scheme is break before make.

Good observation, two DT/DP would be a much safer choice.

Those Niles SAS-1 come up on eBay regularly, often NOS. I keep a couple around for situations like this.

[Link: ebay.com]