Why do turntables sound different?

rsf507,

There are multiple options available. I only stated one of mine. I did not rule out racks, isolation footers, spikes etc.
Thank you for including platforms like minus-k and Vibraplane. Let's not forget that Herzan platforms are available too. 
 
ICs and SCs are one of the options that I have chosen.

I do Like to spend $ on Older Whiskey, Faster horses, Younger Women and Audio. The rest; I am just going to Waste.

Best to All on this Journey 

They sound different for two reasons.

1/  The design choices of suspended, lightweight or mass and                implementation of materials choice and the drive method used.


                                                                                                               
2/  The use in the home environment from either proper, or poor set  up, in both basic parameters and adjustment ,and final placement.                                                                                                                                                                                                                                    

So far scientists among us don’t participate, and I suspect I know why - they have no idea.
If all seemingly great turntables sound different, than perhaps none of them sounds quite right. Each distorts and colors the sound in its own way.
I would also assume that mechanically matching table and arm could be important. And cartridge is the third element. Maybe all three should be matched ?

"Maybe all three should be matched"

I would add everything thing else in the chain.  One size fits all does not really fit in audio regardless of the ad copy and graphs.

Look at Michael Fremer's set-up in that small room with the Continuum TT and big Wilson speakers! I bet he's not too worried about vibrational interference, since the Continuum is a hefty beast indeed!