...a second listen

atmasphere:,

How do your findings relate to a tt with a vacuum sealing function?

If this sort of tt has a metal platter w/ the vacuum sealing function, does the metal platter make any noticeable difference?

If one has a metal platter with an outer ring and a weight...??

stringreen, you experience points out something we all should remember, at least from my perspective.

Even small changes may be audible and many times something new/different may sound better.  So I find the best procedure is to make an A/B/A comparison.  Also of course is to never make more than one change at a time, but you followed that.

@atmasphere 
Interesting take on felt mats, since Linn ships them with their tables. Since no mat is not an option with the Basik, I chose a cork blend. That was before I started spending stupid money on my addiction.

On my Oracle I use the original IsoGroove. Were you referring to this or their new acrylic mat?

is that across the board with all tables?

Yes. The problem is finding a mat that is neutral. Obviously a lot of them cause more problems than they solve so no mat at all might be preferable in some cases.

How do your findings relate to a tt with a vacuum sealing function?

Getting the LP to be flat really increases the effect of the mat and also reduces the amplifier power used since there will be less warp. The flip side if you will pardon the expression is damage that might occur to the other side of the LP. I've seen some vacuum systems do serious damage to the unplayed side.

On my Oracle I use the original IsoGroove. Were you referring to this or their new acrylic mat?

We've been getting the same mat from them for the last 15 years so I'm going with the former rather than the latter.

I like the (graphite) Boston Audio mats.  Sadly, BA is out of the business of making mats.  They do come up second hand from time to time and do not cost a mint. While it is a bit contrary to Atma-sphere's advice, I also like my SAEC SS300 metal mat.  Speaking of metal mats, copper mats are very popular for some reason, maybe because they are cool looking as much as anything else.