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In Reply to: RE: thanks for reading my post with real comphrension posted by jeromelang on December 09, 2009 at 19:16:08
Static charges on a disk seems like a plausible source of problems, I've messed around a bit in this area a couple of years ago but haven't gotten back to it.
But I don't understand how the problem can "hang" in your system and even affect other sources as you mentioned above. That is the thing that makes me think you are pulling our legs. Or maybe it's a mixture of the two.
Anyway I built an electrosope by taping a dog hair to a toothpick and it's sensitive enough to get a decent idea of the charge distributions on the disk and their relative levels. I then ordered an ultra-high input impedance op-amp eval board to make an accurate electroscope but I need to get some teflon triax for it and never finished. The neat thing about the dog hair version is that I could just pluck the active element off my shirt and had it running in less than three minutes. If your trays are affecting the residual charge distribution significantly you will probably be able to see it with the dog hair scheme. If you don't have a dog, I'd be delighted to send you as many hairs as you wish, I'm long on them...
Rick
PS: Please animal lovers, I didn't try anything else so don't give me any static. For all I know human, gerbil or cat hair works just as well or better.
Follow Ups:
yes. static charges added onto discs do sound plausible.
however, i don’t believe transparent cases are removing static – they are probably still adding static, but of a different type instead.
here's a test you can try easily (for a healthy system unlike mine):
wrap your CD in common kitchen aluminium foil. there are usually 2 sides to aluminum foil - 1 shinny side and 1 matt (non glossy) side. take turn to wrap each side over the same CD and play it. the shinny side will create a bright thinny sound, while the matt side will create a very dull sound. both sides are adding static. but the static condition they created onto the disc is opposite to one and the other.
so if we assume the black colour case is adding some static charge, while it cause my system's imaging to skew towards the left (always the left), it also impart a mellow, bloated sonic signature to the sound as well. i notice, over some time, some of this sonc signature get attenuated the longer the disc is being played.
when the same disc has touched a transparent case, and then played through my system, not only does it kick centre-fill imaging back to centre position again, it also imparts another sonic signature - something brighter, a more open and recessed soundstage. some low level details like piano pedals and intake of breath become more audible. but this change is not "stable". overtime, the sonic signature and the size of the soundstage get attenuated, the longer the disc is being played. but all the while the center-fill imaging remains stable in the center.
if the dark grey cases are adding static, then it stands to reason that the transparent cases are adding static too - albiet of the opposite type. So when this opposite-static-charged disc is played in my system, it restores equilibrium to my system previously infected with static in the other direction.
now i believe when the audio system has a neutral static condition – a balance containing either types – then imaging can be properly projected.
makes sense?
now take this further - if an audio system is not afflicted by any adversed static condition - then sound can be further improved?
this will be a subject of future posts.
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