I have not experimented with my TT isolation since it is a mass loaded TT which weighs about 120 lbs. For it, I borrowed Chris Brady's design which includes a sandbox at the top with legs filled with concrete which makes for a dead surface upon which to place the Teres 340.. Dance, jump, do whatever in front of the TT while its playing and there will be no effect. One person criticized the setup as being dead. Yet all I can say is that if my grin got any bigger it would bust my face open.
That said, I have played with CDP footings and when I had a lighter TT, different shelf materials. I can tell you that harder materials make for as brighter sound. Wood makes for a softer sound on the highs. This includes the rollerballs I use under my cdp. My wife was recently shocked at the sound difference of the different ball materials of the rollerblocks used under the CDP. I can increase or decrease the highs especially just by the material used in the rollerballs. Therefore I am a firm believe in footers for source equipment especially
That said, I have played with CDP footings and when I had a lighter TT, different shelf materials. I can tell you that harder materials make for as brighter sound. Wood makes for a softer sound on the highs. This includes the rollerballs I use under my cdp. My wife was recently shocked at the sound difference of the different ball materials of the rollerblocks used under the CDP. I can increase or decrease the highs especially just by the material used in the rollerballs. Therefore I am a firm believe in footers for source equipment especially