|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
72.130.117.241
In Reply to: RE: laugh all you want posted by madisonears on March 28, 2015 at 02:28:21
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
Follow Ups:
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.
Post a Followup:
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: