No... not so worried about that, Lovin... from the metro rack perspective... its just metal shelving that has the potential for ringing and/or rattling, so for 50-60, I can pretty much neutralize that (I think) and save up a little for an actual rack that looks nice. A can of
Boom Mat to spray the underside of the shelves (got that idea from the TNT/flexy plan site), some
Neoprene, and the MDF. Hell, if it works, I might just put a dress and some lipstick on that pig with some iron-on veneer and try my hand finishing it.
BTW, that foam place does
acoustic foam too, if you're ever interested!
And for the room, I've got some other tricks, too. But since I can't fix the floor boards or joists, I just gotta take the other steps to kill some of the vibrations across the house.