Mains power and conditioning

[sam1000]

Do any of these power conditioner companies provide measurement data - at the analogue output - with and without them?

It seems some are happy to show noise sniffer type stuff or oscilloscope measurements directly off the conditioner on the mains side - and use this as proof that they're working - but I've never seen anything out of the speaker terminals or DAC output. Something like a Devialet would be perfect for this.

I'm not saying it can equate to what's good or bad SQ, but it should show an obvious difference before and after, using any of the tests experts in this stuff use. I.e. Ok so it reduces noise on the power line, but did that noise make any audible difference at the output in the first place, or did the audio equipments power supply just deal with this anyway. But if so, by how much did the conditioner improve the situation? Surely it would be easy and obvious to get measurements just to prove it's not all placebo?

I started getting interested in the idea, but the more I read - by any competent scientific body - the more I'm inclined to believe it's voodoo. But I'm ready to be converted - just not by listening to one and convincing myself it's working.

I'd like to see someone like archimago put one through its paces to be honest.

Not ideal, but at least something..
https://www.youtube.com/watch?v=SAAEhtAUT34
https://www.youtube.com/watch?v=7zAfnCX3-qk
This is the same guy who designed Audioquest Niagara 7000 as well.
I was in the same boat as you and resisted power conditioners for years.. what a mistake :-). Of course a few people will have clean power in their house, but I'm certainly not one of them from the sound of it :-)