DK Design VS.1 Reference mkII - Optimization

Audioari1, can you provide a link to an article discussing electro-magnetic bounce effect?

I have done a search for "electro-magnetic bounce effect" and found nothing. I have found several articles discussing electromagnetic field radiation, and ground bounce, but these are two separate phenomenon, and ground bounce is controlled by the adjusting size of wire traces.

Here's the article

Work in progress....My speakers don't really allow me to turn up the volume much past the 9 o'clock position with out involving the neighbors and I also noticed the lack of heat produced and decided to try something to see if it improved the performance. In the past my MC275 tube amp sounded ok at lower levels but really started performing at the higher volume levels. Anyway I have a sony cd with an adjustable output so I simply dropped the input signal and cranked up the DK to the between the 11 & 1 o'clock positiion to see if hopefully it works a little better. I think I may be on to something.....
Does anyone have any info on what the pots on the preamp board relate to? I remember reading something about the adjustablity of the input...
The meter is not as entertaining but I am thinking at this point that it sounds better.....

Tvad, I am telling you the amp sounds better with the aluminum cover off. In an industry where people use little pebbles, roller blocks, and expensive power cords I find it surprising that you should have difficulty accepting that the aluminum cover degrades the sound of the amp while a Lexan cover does not.

Also, while aluminum is non-magnetic it still will bounce more of the EMI then a Lexan cover will. If you shoot an electron into an aluminum plate the results are very different then if you shoot an electron into a Lexan plate.

Audioari1, I'm not disputing the effects you hear, and I would like to learn more about the electromagnetic bounce effect (EMBE) to which you attribute the difference in sound. There a dozens and dozens of amplifiers, preamplifiers, and CD players that use aluminum cases and covers, and I have never before read about the deleterious effects of aluminum as it exacerbates EMBE. If EMBE is a cause of less-than-ideal sound, and if it's effects are so apparent, it seems to me there would be far fewer components utilizing aluminum cases for improved shielding.

With your help, I'd like to understand this better.

I'm assuming you have read somewhere about the electromagnetic bounce effect, how it bounces more readily off some materials than others, and how it relates to the performance of audio components. Since I'm trying to learn more about physics and audio, any link or reference to an article/study about electromagnetic bounce effect would be appreciated.

Have you ever considered taping a sheet or two of ERS paper (ERS blocks EMI/RFI) to the inside of the cover of the DK and listening for any difference?

I have not tried ERS paper, but one manufacturer that supplies a lexan cover instead of an aluminum one is DartZeel. Their amplifier, as you can see in a lot of literature, is supplied with a clear cover specifically for that reason.

Maybe shoot an email to DartZeel to explain this effect in more detail?

Also, while I believe that almost all components sound better with the aluminum cover off, this effect is especially prevalent in the DK amplifer where the difference is quite dramatic.