I had a P25 and used the Way Excellent Mat by Herbies Audio to good effect.
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I have two P9s - each has a Herbies mat. A Way Excellent II on one and a Grungebuster on the other. Of the two I prefer the Grungebuster, which seems to minimize static electric charges on the record - - but according to Herbie's blurb, the Grungebuster was specially designed for ceramic platters like those on the P9.