John Gallup Posted December 10, 2020 Share Posted December 10, 2020 When the dealer was installing my new M5-HPA amps (powering the also-new Quatros), they showed me how the metal case around each amp had some damping material affixed to it. This is presumably to keep the sheet-metal from "ringing" when music is played. And in fact when you tap on the buttoned-up amps you get a dull "thud." Inspired by this, I ordered some 1/4" Sorbothane sheets and stick-down adhesive to treat my preamp (Rogue Audio RP-9) and phono pre (Rogue Ares) both of which have substantial expanses of sheet metal in their cases. I applied the stuff and put them back together, and I swear I can't really hear any difference. Both still make a "doink" sound when tapped, compared to the dull "thud" on the amps. Did I use the wrong damping material? Does the ringing occur at some frequency independent of what I generate by tapping on the case? I realize this is pretty geeky/esoteric, but would be interested in any opinions. Link to comment Share on other sites More sharing options...
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