I mostly listen to music sent from Roon via ethernet to the QX-5/20. Although I've been powering up the QX-5, KX-5, and VX-5 with the remote before sending a file, I've recently discovered that sending a file to the QX-5 powers up the Ayre chain. In a previous setup, I had noticed sending a file via USB powered up the DX-5 DSD, but it was connected to a Parasound JC-2 preamp and JC-1 monoblocks, and the JC-2 needed to be powered by its remote. I assume the QX-5 powers up when it senses a signal and powers up the chain on the Ayre link.
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