bitflipper
It amazes me that these kinds of things are often shown at AES. NAMM, I can see. But AES is supposedly attended by "engineers", whom you'd think would be a tough crowd. I sure wouldn't want to be the guy demonstrating magnet therapy at an AMA convention.
You pretty much hit it on the head!
But as bad as the foam ball is, I really felt sorry for was the clown selling power cables for several hundred dollars a piece. He had a little booth set up (not on the trade show floor, even the AES has standards) and was trying to convince folks that a power cord would make their gear sound better.
Actually, I have no pity whatsoever for folks taken in by snake oil salesmen... most of this stuff is still governed by the good old laws of physics. IF your power cord is presenting a significant impedance to the power source then it is possible that you can hear a difference if you replace it with a power cord that does not present a significant impedance. Possible... not guaranteed.
The catch?? Hey, when I was 20 I could not understand why anyone would spend $1500 on a microphone. I thought they were snake oil. Then a studio where I worked ended up with a U-67. You could plug that into a Norelco (really obscure reference here) cassette recorder and hear the difference.
So I learned not to use cost as the only figure of merit. Sometimes you do have to listen. Oh, yeah, you ALWAYS have to listen, but sometimes listening to common sense is good enough. And if I could come up with any reasonable explanation for power cords making a difference I'd probably give it the benefit of the doubt.
Not so long ago I designed a prototype using the InGenius input chip from THAT. I happen to know, and respect, the designer of that chip, but I still thought there might just be a wee bit of enthusiasm in the marketing copy. Danged if it did not exceed my expectations. Proof again that sometime you just gotta listen (and in this case measure.)
And heck, some of the best and the brightest have spent much of their time trying to align subjective and objective analysis... so I don't feel too bad being both cynical and curious<G>!
But the foam ball????