This is Sam Tellig's old tweak from back in the time of the Combac dots that people (yeah, me too) put on their speakers to change the resonant frequency of the cabinet. I think that Sam felt that the dots did work, but they were expensive (he was the Audio Anarchist or Audio Cheapskate at the time), so he theorized that you might be able to get the same effect if you taped coins to the speaker. I've forgotten what he concluded, except that I seem to recall that he did say that by using nickels, dimes and quarters instead of the dots he would be saving a hell of a lot of money if the tweak didn't work! And I also recall a bunch of letters to the editor claiming the tweak worked.
