I have used the origonal Stillpoints with risers and now the Stillpoint Ultras,under my TW accustic Raven one. The Ultras are marginally better, but not enough to justify the price differnce, IMHO
I have used first SP Ultra SSs under both a Bergman Sindre and a Nantais Lenco Reference. Later I used SP Ultra Fives under both. The Ultra Fives were far superior and as always four feet, whether SSs or Fives, are clearly much better than three.
I must say also, that I never liked the original StillPoints or their aluminum units.
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