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In Reply to: RE: LOL! posted by unclestu on March 27, 2015 at 21:42:06
I guess I've been insulted. I have no idea what "show your feathers" means.
You mentioned heat first. Read your own post. Are you aware that there is a certain optimum temperature range in which most equipment is designed to operate, and that temperature is probably established with covers in place (for obvious reasons)? This is nothing like removing the grilles of your speakers. A properly designed amplifier should incorporate heat management that allows for removal of excess heat. The only possible benefit is a slight extending of the already long life span of electrolytic caps. If your amp is so marginal that you need to cool it, perhaps you need a new amp.
Now you change your story and make a claim about the chassis generating EMF. Ooooh, EMF, the invisible, unquantifiable bogeyman of every shuckster sales pitch and audio paranoid. I think you have heard so much of this manufacturer's marketing malarkey that now you regurgitate it and believe it yourself. Please tell us how a chassis, other than the transformer which can be easily managed, emits EMF and how removing the covers of equipment reduces any kind of radiated interference? Most interference comes from OUTSIDE, and a metal enclosure on all sides is the best way to block it.
But if your equipment sounds better with the covers off, that's great. I won't argue that point for a second. You don't need to justify it with pseudo-scientific gobbledygook about why you think something might have an effect on the sound. I find it difficult to tolerate posting "facts" about why something you perceive is happening and thereby misleading other people who might read this forum and believe what they read here.
If anyone who doesn't know better is paying attention, DO NOT remove the covers of your equipment while it is in use. Exposing line voltage components or delicate parts can be dangerous. Most radiation and vibration comes from outside the equipment, and effort should be put into properly shielding it from both. If you want to do something, unplug it and securely attach a flameproof material to damp the top and bottom of the enclosure from vibration, which will probably have a positive effect on the sound after you put the cover on and then plug it in again.
And how did dust become part of this? I mentioned damping the cover of my CD player. What does that have to do with dust on the lens? I think lack of reading comprehension rears its head here more than practicality.
Why did you get into this at all? I made a comment about one piece of "DG" equipment without a cover and one with a plastic cover that might vibrate. "DG" spends a lot of time eliminating vibration from his system, with which I mostly agree, and posting positive results here. I saw that as a contradiction and wondered how he might reconcile it. It had nothing to do with you. I suggest again that you butt out unless you have something positive to offer, but of course you can post whatever condescending crap you like. Nobody is prowling, but you're certainly interfering.
I don't know how you're advancing audio by laughing at posters here. I guess they're taken seriously only if they accept your self-serving, pointless conjecture about why some things make a difference in what we hear, or what we think we hear.
And I really don't care whether you cook your magic rocks or sleep with them under your pillow or wrap them in Teflon tape or dip them in soft cheese. Notice I don't ever comment on your many threads on the subject. And I didn't write anything about that brass screw driver-mounting business, although I was tempted. You can believe what you want to believe, and anyone can follow your advice if it does not pose a threat to their safety.
Tom E
Follow Ups:
Showing your feathers= Showing your stuff.
There are often many reasons beyond a single aspect of sound which has to be factored in with modifications. That I saw some alternate reasons, I believe is a factor to be considered, whether or not you consider it important ( it is to me)
It is a well established fact that any AC signal ( read signal or even AC power) generates an EM field. Standard physics from the 1800's support this principle known as Faraday's law.
At this point, i can see any further attempts at elucidation would be wasted, unfortunately, so I will voluntarily terminate any further discussion with you
Peace
Yes, I agree that AC in a wire results in an EM field around the wire. How does that tell us that removing the cover from your equipment has some positive effect on EMI? Like Madisound said, if anything, the chassis is a sort of (not very good usually) shield. As a shield, it works both ways, keeping EMI emitted by the circuit inside the chassis and also blocking EMI from without. Do you posit that in this case, removal of a modestly effective EMI shield is why your gear sounds best with no cover? (I too have observed this phenomenon, by the way, but I don't pretend to be able to explain it. I think it is more likely due to eliminating some chassis resonance, but I really don't know. You'd think that a tightly covered chassis with a dampening weight on top would be less resonant than an open chassis, which is also more flexible because of the absence of the cover.)
For this reason all Audio Research Reference line of components have plastic perforated top covers. I heard from the dealer that its' not cost cutting measure but it just sounds better than metal covers .
Edits: 04/02/15
Ahhhhh, bout 9 years ago I fabricated some 1/4 inch polycarbonate top covers for a wealthy customer, but his amp ( Ref 300) went kaput and he had to send it back as I was too ill to work on it.Even drilled the top vent holes to spell his name, which pleased him immensely.
Oh Yeah Stan Klyne has plexi covers standard for all his preamps, including his phono units. Back in the early 80's me made a few to show case his workmanship for dealers. IT did that beautifully, but it also sounded way better, so it became standard
Edits: 04/02/15
Actually removing covers removes the cover running parallel to the PCB. It forms a giant low level capacitor rolling off the top end.
If you ca find it, read the Counterpoint white paper about why they copper plated their chassis ( both tubes and hybrid designs).The spurious magnetic fields all create surface "eddy currents". The plain steel has high resistance, the copper speeds up those currents.
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