I've been using a food grade mineral oil -- the same stuff I use on maple block surfaces -- very effective, safe and non-toxic when lips are pressed against the speakers.
I'm using a "mini-Statement" ("Comment"?) system. ML CLS 1's with Kinergetics SW800 sub towers. Yeah, I love these speakers so much that I get a little kinky with them late at night. Hence... the non-toxic oil ;-)
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