Not enough information here, but I’m concerned about your setup. Where is the pre-amp connected to your Technics stereo? If it is the Phono input, that is not supposed to be pre-amped, it is expecting a phono level input, not a substantially higher line level input that a pre-amp puts out. I have no idea if there is protection on that port to keep from ‘burning out’ the input, you’d need to check with Technic’s customer service folks.
Your issue isn’t a Sonos one, if the CD is playing through the Sonos system via the Port, the issue is somewhere in the Technics.
Hi
I’ve sorted it now. I plugged the pre amp into the aux input and now it works.
thanks