Same Old DD
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A lot of equipment makes a physical hum when operating and there are huge numbers of products and varying ways to isolate that 60Hz droning sound from other more sensitive equipment. Some gear you can just lay your hand on it and tell if it is on or off. Steve sells some isolation products which look to be very cool and even sciency solutions. I would love to try some, but I don't have anything that contributes substantially to this problem.
I can certainly tell if my Zens are on or off by touching them, but a rubber matt keeps any of that movement from transferring to the rack/stand. It's minor.
My rack is a DIY affair made from an inch and a half thick doubled MDF shelves, open on all sides held together with all thread columns at each corner. Very '80s and not at all elegant, but it allows me to level each shelf perfectly front to back, diagonally and side to side and it works fine for me. It's pretty heavy!
As far as eletrical interference (transformers interacting with each other or with sensitive components like foil caps, which often sport some inductance, BTW) between two units in a system, I think distance between them is the most important factor rather than an attempt to cobble some kind of shielding between the two. Even if some eletrical shielding is desired, you will need to ground the shielding somehow or all that energy you just attracted to a plate of light steel or something will just sit there with no place to go and your shielding will not really do much.
Maybe someone with a proper Degree in electronics engineering can pop in with a more studied response.
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SE84Cs Mono'ed, Lii Audio F15 OB, W15 "H" Frame Subwoofer, McIntosh MC2500, Lazarus Pre, Dual TT, Ortofon, Kleenline Iso Power, Revox, Crown R-R, Pioneer Elite Digital Source
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