Heavier stone and marble blocks are even better and probably cheaper than Butcher.
My turntable rests on around 1000lb of marble spiked to the concrete slab in the ground.
Infinite mass loading, or the mass of the Earth at any rate.
Butcher Block Acoustics
I wanted to give a sounding shout-out to Butcher Block Acoustics. I placed an order Saturday and expected to receive the turntable isolation platform in the next few weeks due to some of the lingering shortages. Nope. Same day shipped and pickup by USPS (on a Saturday!). Item arrived in two days as being in the same state and safe as can be. I can't believe I was looking to upgrade my cartridge and preamp before giving turntable isolation even the slightest of a shot. I figured my Solid Steel S3 rack had things handled... I was thoroughly wrong. Absolutely 100% wrong. Isolation is such a fantastic upgrade and the 3" Butcher block with simple rubber isolation feet have gotten me to where I need to be. Thank you Butcher Block Acoustics crew!