Worrying about mechanical resonances is one thing when you're dealing with a device that's designed specifically for electrical -> mechanical energy conversion (IE, a loudspeaker), but a completely different thing when you're talking about mechanical resonances in a device designed to pass the signal electrically.
However, it's not at all intuitive whether or not applying that to an amplifier chassis, capacitor, or whatever else would have an effect on the frequency response, distortion, or even 'sound' (if you like to use that term)
Peter Daniel said:I've also heard that removing plastic covers from electrolytics improves sonics. You got two different materials interacting with ea. other. When you remove one the vibrational properties change and possible change in sound signature could be observed.