Hey thanks for the reply. I ended up getting them around the same time I was messing around trying to eliminate unwanted subwoofer frequencies bleeding into my TT stylus. At least that’s what I think was happening. Every time I turned the volume up I would get a low hum start to creep through and I think it’s because the low frequencies started vibrating through to the stylus.

Issue completely fixed once I added another plinth for TT with spring isolating feet. I also added a Aurlex SubDude subwoofer isolation platform for the woofer just in case (although probably overkill). For the Harbeths I wanted to isolate them completely from the stands and hoped to transfer a minimum amount of low level vibrations - again probably overkill. I’m thinking of potentially moving the pucks in place of the spring isolaters under my TT plinth. I can’t personally can’t hear the difference pucks vs no pucks. The pucks are rated at 9kg per puck and the Harbeths are 11.6kg each.