Thanks for posting the link to that article, very interesting stuff.
I myself have actually battled with, what I believe to be, some of the issues that are discussed in that article in terms of noise,interference..etc between my amp and speaker combo of choice. I had a thread running over on WBF
http://www.whatsbestforum.com/showt...n-aluminum-speaker-cabinet-attract-more-noise a while ago describing my issue which was ultimately resolved by significantly increasing the length of the speaker wire between my Class D Hypex amp and the speaker in use (Magico S3). I still don't have a full grasp on what exactly the root cause was for that problem but the article linked by Opus111 does shed some light on possibilities of why the issue is happening in the first place. For what its worth, the issue occurs with EVERY Hypex Class D amp I have tried when teamed with my particular speaker in my listening room. This includes NC400,NC1200 & the Mola Mola Kaluga amps I use today.
After reading thru the "eetimes" article a few questions came to me. It seems possible that there may be downsides to having a very, very, very low Output Impedance on the amplifier side. If I was reading the article correctly, it looks like a very low Output Impedance does not do a good job of resisting the EMF Backwave heading towards the amplifier which is generated by the transducers in the speaker cabinet. In my case I wonder if by increasing the distance of the cable this EMF Backwave is then dissipated enough to not result in hearing the noise I describe in the WBF thread.
I'm not sure if anyone is familiar with this tweak or not but I've considered trying it just for the heck of it. There have been a few long threads posted about it on different forums over the years. The "Tweak" I am referring to is know as the "Exemplar Audio Loop" which is basically an extra strip of 2ft long wire that is attached to the Negative Terminal of the speaker cabinet which supposedly "catches/attracts" EMF Backwave noise on its way back to the amplifier. Snake Oil? Probably, but some day when I'm bored I may give it a try in my setup to see if it magically allows me to then use shorter speaker cable in my setup.
I do wonder though if these additional lengths of wire attached to the negative terminal of the speaker cabinet would interfere with the Damping Factor of the amplifier?
In any case, good thread and interesting information