Lewn,
I think this better illustrates what i'm trying to get across.
Simon yorke s10 designer, a stereophile interview(taken from a review of one of his tables:
***I questioned Yorke about the laminate; he told me defiantly that "I have a box as big as this sofa at home full of materials I've tried for armboards. It sounds preposterous, but I've been driving along in my car and I've seen things lying by the side of the road and I've put on the brakes and jumped out of the car and grabbed this thing and put it back in the car and taken it home and machined an armboard out of it to see what would happen and listened to it. It's kind of obsessive, really. You can talk about machining and all the bullshit people talk aboutbearing tolerancesbut materials are awfully important. And if you change these materials you can make [two] turntables from the same set of drawings...[that have] completely different sonic signatures. I've got boxes worth of platters. I've made platters out of wood, stone, glassany number of things. The same with armboards." ****
Also as you say...****if we take that the job of a plinth is essentially the same no matter what it is made of, which is to be "neutral..."
But what is neutral? And how do we get it? How many different sonic attributes does a material need to be able to pull off RIGHT in order to portray NEUTRAL perfectly. (alot) I think you've made my point. We THINK to arrive at neutral is a SIMPLE endeavor, yet micheal fremers former reference table designer simon yorke is slamming his brakes on the highway searching for a great armboard material!!! Why do you think he didnt just order some slate or panzerholz?
Again as i said now multiply that by the materials used in other systems and theyre quantities/qualities AND how they will ultimately interact with a plethora of other items within a system, you realize the complexity of arriving at the finest level of playback is complicated.
Notice that simon must obviously do alot of experimenting and not all of it is objective or can be predicted or measured. I take that to mean that sound and how it will manifest itself is to some degree still a mystery. Remember also that he did his listening and designing in some degree IN ISOLATION (as do all/alot of designers,ie they use theyre own gear, cables, cartridge,(not yours) to fine tweak. This means that his results to a greater or lesser degree are biased toward his system not necessarilty ours , therefore results will vary to some degree, hence the complicatedness of it all.
Yes, we can and do make progress and we can feel safe that a slate or panzerholz plinth are good bets and a very good place to start but their not blanket, across the board answers or guarantees of anything (i think)(and i think maybe some think they ARE)...but for the finest of finest nuances to be brought out in a system, that last, little bit, you have to experiment with mats, cartridge bolt torques, footers, cables, cartridge shims, tube rolling, racks, different armboard materials, speaker placement, vibration control, room treatment and you kinda have to do it on your own and trust your ears.
I think what makes vinyl playback so full of potential and special over digital is the fact that vinyl playback is DEPENDENT on the mechanical vibrations of MATERIALS to mimick reality.