There are three kinds of tweaks:
1. Those that have a sound (excuse the pun) electrical/physical explanation of how they work.
2. Those that do not benefit from such an explanation, but are still susceptible to work because they interfere - even if in ways unknown or not disclosed - with one of the three elements of musical reproduction (electrical, mechanical and acoustical).
3. Those that simply don't work, because there is no possible way they do! And this has nothing to do with debunking myths or any other flat-earth beliefs: they cannot work simply because they have no way to affect any of the three stages of sound reproduction outlined above.
Please don't get yourselves into a fit - I do love music as much as you do - but just face it: music is nothing more than sound, and sound is just "a pressure disturbance that moves through a medium in the form of mechanical waves. Yes I know this might hurt your feelings, but your favorite Beethoven, Patricia Barber or Led Zeppelin recording is nothing more than "pressure waves made up of compressions and rarefactions."
So no, you won't change these pressure waves by putting your photos in the freezer, washing your hands before listening (although washing your ears might help) or writing "'x 26 'x on your mirror. Why it won't work? Well, simply because it can't! But by all means, if you are sensitive to suggestions just use them - no, your system won't sound any better but you will think it does... and at the end of the day, the only thing that matters is your own satisfaction!