Thorens TD 320/Lyra Delos ringing/clinking noise

Hello all. First post here. 

I have had my Lyra Delos for about 9 months and love it. After careful setup and the break-in period, tree sound really opened up. Initially, I was using it with a Thorens TD 147, but I was getting a weird ringing/metallic sound that was audible on headphones.

Various testing determined it wasn't the motor on the table, so I assumed it was an issue with the Thorens suspension or tonearm (TP 16 mkIII). I then bought a Thorens TD 320 with a TP 16 mkIV tonearm, carefully mounted the Delos, and what do you know, I'm getting a very similar sound. It's almost like a clinking/ringing sound at around 700hz.

Before I start swapping cartridges (not easy with these Thorens tables), is this the kind of sound that could be the result of a faulty suspension/damping inside the Delos? The tracking is fantastic, the cantilever rides at a 90 degree angle during playback, which would lead me to believe that it's not the Delos suspensionm. I am still within warranty period though, so I'd like to get this resolved sooner than later if it could indeed be something defective with the cartridge.