That's a nifty device. Have you tried plugging the ADA into the same (duplex?) outlet as the Denon?
Yeah, no luck there. I spoke with Andrew yesterday, and he suggested I could try unplugging the signal ground wire inside the ADA (chassis would still be grounded, so no safety issue). Not sure what screwdriver will work on the ADA chassis screws though, and I remember you saying that they were self threading, so may not go back in perfectly after initial removal