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As an inmate with a reasonable idea how his electronics work, I can say without hesitation that putting my photo in the freezer or receiving any kind of telephone call whatever will not change my hifi's output. However it may well change what I THINK I hear.It's clear from the variety of things that the PWB guy suggests (breaking sticks and arranging them at different angles, pinning corners of curtains, etc) that they aren't themselves relevant, the accompanying expectation is. This is why cable people don't do DBT - you've got to know there's a change to hear one, obviously - unless there really is one of course! And this leads me to realize what definitely WOULD work as the number one hifi tweak of all time. It would cost money, but the effects would be profound. All you have to do is... get a hypnotist to embed in you a deep-seated belief that your hifi sounds absolutely wonderful.
Edits: 12/14/07Follow Ups: