WiFi enabled 12V trigger in relay/switch? (Without having to wire one up myself)

Just in case anybody stumbles onto this thread in the future, two points to close the loop:

1) The solution discussed above will work fine and not harm the amp;

2) I am embarrassed to say, that the solution is unnecessary. In checking with the NAD dealer who sold me the unit, he pointed out to me that buried deep in the C399’s controls is a feature called “Network Standby”; if it is turned to “On”, then the amp remains available on BlueSound and Roon and when selected for streaming, the power will turn on and all is good.  It will also turn the unit off after 15 min (or 20?) of inactivity, but then it will turn back on once you stream to it again. (This control can only be accessed via “Settings” using the controls on the unit itself; it does not appear in Settings via BlueSound, Roon or the unit’s IP address. )

Love it, @jeffbij.   (But no Echo or Alexa will be in my home .)

 I’m going to climb up to the remote shelf where that amp sits and try this tomorrow!

@kirkwallace - At that price, I'm betting the iFi power is regulated. And if you all ready have it, then it won't cost you anything to try it.  

I have setup several "second" systems around the house using similar setups with the Amazon Echo devices to control the plugs.  It is nice to be able to walk into a room and say "Alexa, Garage Stereo on" and presto, the equipment turns on (or "Alexa, Garage Stereo off").  And you can find used Echo Dots on eBay for <$20 with shipping. 

Thanks @allanblissett, but I have doubts about that transmitter’s ability to reach the outlet where this equipment sits. In any event, I don’t think that it would work any better than the WiFi smart plug. The real bit I was concerned about was plugging in the 12V PSU into the amp. But i think, based on answers here and comments elsewhere, as long as it is a good PSU with regulated voltage, it should be fine. 

Just get one of these, works great. 

https://a.co/d/7mLx91E

Thank you @jeffbij . And you guessed right, i don’t have Echo or Alexa, but something the the Kasa/TP-Link plug (or the Groove) that works with any WiFi in 2.4 GHz and doesn’t need a proprietary hub was what I was thinking about .

and thanks for the warning about the regulated switching PS. I have that iFi one lying around unused and i think it is regulated, but i will double check.

@kirkwallace 

Easiest way is going to be #2.  It is even easier if you are using Amazon Echo/Alexa devices in the house. You can get an Alexa compatible plug for as little as $8 to $10 dollars each. (The Kasa/TP-Link units work well.) If you don't want to use the Echo/Alexa enviroment for voice control, you can still control the plug using the app on your cell phone.  And if you have more than one device to "trigger", you can build routines to control multiple plugs/wall warts with one command.

One thing on the wall-wart.  Make sure it is a "regulated" switching adapter.  Non-regulated ones can cause problems with some triggers because the voltage will drift.  And you don't need to spend $80 for one.  You can get one on Amazon for less than $20.  All you are doing is triggering the relay.