Periphery Record Rings

That's my initial thought Spence. The primary issue with my rig is nasty subsonic effects. I think a periphery ring would help with that more than a heavier platter, as much as it would be a PITA (not the bread).

I'm mostly wondering about the quality of this new brass ring.
- Has anyone seen it yet or is it brand new?
- Is there any slippage on the LP edge to worry about?
- Should that be damped where they come into contact or just leave it as metal to vinyl?
- Is the concentricity (is that a word?) good enough to ensure that there is no out of balance issues that would affect speed stability?

Bob

Here's some thoughts from another source that I have queried on this topic:

"I think the only way to go is with a matched fit with 3 point engagement on the outside diameter of the platter so you don't give up concentricity and minimize resonance transfer. If you locate the ring on the O.D. of the vinyl record, you're depending on the record being pressed dead on concentric and this rarely happens. The ring then rotates about the same eccentric axis as the record and destroys balance."

An interesting thought for sure about a non-concentric record's problems being emphasized by the ring. I like the thought of there being some kind of centering mechanism for the ring, to ensure concentricity, but implementing something that is also user friendly (given that a ring is generally NOT user friendly to begin with) could certainly pose a design challenge.

As for the brass platter plate, my mind is still uncertain on this one. I like the design of my black VPI platter, where the record and the platter are similar and rather effectively coupled via the VPI clamp. I may wait to see how that one fares on your rig Dave :-)

Bob

When all said, the only way to determine if the ttouter will work for you is to try it. All different TT's will react differently. TTouter offers a full refund, with no restocking fee. You are out the in and out bound shipping. It's worth the try so you can be put to rest your doubting and wondering.

Bob, I also have the VPI black delrin & lead platter. The thing that got me interested in the brass mat is how much better brass sounds than stock delrin in the feet of my TNT. Who knows how brass will sound coupled to vinyl-- though there are a few high end TTs out there with heroically heavy brass platters.

The VPI weighs (about 5 lbs total weight) much more than the brass one in the above link. It fits snuggly to the outside edge of the VPI platter, so it is very centered. It helps warped LP's only a bit (in my experience). I don't feel it is a PITA, but that's me. A couple LP's I own circumference is too small to allow you to use the PRC (2 out of 4-500 approx). I have no experience with the TT brand PRC above, though I am considering a TT brand center weight.

I realize this did not answer your questions, but I still hope it is helpful...