A Copernican View of the Turntable System

Atmasphere,

Thanks again. I'm going to load up the arm tower as soon as I find a local engineer able to undertake this for me.

On frequency extention, I'd hasten to add that I am playing this set up at very high volumes and the quality needs to be heard to be appreciated. So as I said, I think for everything to click into place I will follow your, Chris and Henry's suggestion of building a heavy arm tower. The gains I already have with the current approach to decouplling makes this a more than worthwhile endeavour.

Grateful for all your kind suggestions and contributions.

The arm pod I'm having made is roughly the diameter of the AT 616. When I get my TT back, 3 616's will go beneath the TT and 1 beneath the pod. Hopefully it works out. Before, I had the TT and arm board sitting on different isolation systems: TT on 3 AT-605 footers and arm on Herbie's tenderfoots. Sounded good to me--but maybe I'm hard of hearing.

Incidentally, while my TT is in the shop, I've been borrowing a Sony 2251. It sounded woeful at first. I almost gave up and on a lark put the tenderfoots beneath it. Much, much better. Pretty good table overall, in my amateur opinion.

@Chris: how did you put spikes beneath your sp10? I'm assuming there's a board in between? That is, the TT sits on the board and the board is on spikes? Or did you thread spikes directly beneath the chassis?

Of course, to chauffeur Garrett Morris' and the baby's relief, the rabbi was successful. I guess I will go back to maintaining radio silence. We now return you to our regular programming.

By the way, in the real world there is no such thing as "complete (mechanical) isolation", which is why I take the position that I take.

By the way, in the real world there is no such thing as "complete (mechanical) isolation", which is why I take the position that I take.

So when someone claims to have built an 'acoustically dead' plinth, claims of death are exaggerated? Or what does that phrase mean? Really, I don't know. Is it something separate from isolation?

If one can create an acoustically dead plinth for one's turntable (as a whole), then mutatis mutandis why couldn't one create separate acoustically dead plinths for TT chassis and tonearm? Does that mitigate the concerns regarding coupling? Or is that a method for coupling?

Too many concepts; too little knowledge (on my part).