Ah, so it is. But there is also a transient heard in the speakers. Not so loud and more of a pop sound. I'll look into boxing the pi/audio injector to reduce the relay noise.

Iain

Hi, 

I've been using the Pro card with the XLR preamp on a Pi 3b to listen to Qobuz and Tidal streaming services by way of the Logitech Media Server (LMS) running on the same computer. My system has never sounded better. There's a quiet but noticeable "tck" sound, however, when a track starts,  when "stop" is pressed on the LMS interface and sometimes two tcks are sounded between tracks.

It's not a big problem, but I thought I'd mention it. It never happened with the old audio injector stereo card. I've tested the streaming with LMS's standard web interface and also with an Android app called Squeezer.

Cheers,

Iain