Synergistic New Tesla Line...Any comments?

Karelfd, I suspect that you have dc on your ac line.

Karelfd, the wall wart in the MPC is just a garden variety 300mA 24V transformer that you can buy for about $15 online. I've had a couple of them burn out, and after once buying the real deal replacement for an idiotic price, I just replace them by cutting the wire and splicing in a new transformer. So, perhaps you can try a replacement transformer and see if that stops the noise.

I don't think the little pyramid sticker has an audible effect on the sound!

Der, If the MPC is installed upside down, it will affect the active shielding. Not sure if that would make it humm though.

Of course. With the pyramid upside down, standing there on its little point, the shielding is sure to become unstable, eventually toppling over and ending up, oh, I'd say about 120 degrees out of phase. I would not expect a hum, though. Maybe a little THUNK when the pyramid topples onto is side.

These cables are excellent in my system, but I think it is coincidence...I just cannot believe in their "technology". Not since they began selling those little teacups, using tubes to power the little blue lights, allegedly zapping things with a gadget from a spooky movie, and invoking "quantum tunneling" (I do indeed know what that is, and I assure you it isn't happening), all the while saying nothing at all about how their cables are configured or what they might be made of. I guess I need to forgive myself for being stooged and sell them as a matter of principle.

The MPCs output dc not ac.