Nice find. Still reading but this part is not good for ifi:Hmm seems that some guy has measured the AC purifier here: https://translate.google.com/translate?sl=auto&tl=en&u=https://ameblo.jp/nightwish-daisuki/entry-12511372962.html
Nice find. Still reading but this part is not good for ifi:Hmm seems that some guy has measured the AC purifier here: https://translate.google.com/translate?sl=auto&tl=en&u=https://ameblo.jp/nightwish-daisuki/entry-12511372962.html
Hmm seems it only works grounded, and the effects where minimal at best when RF was induced via phone call.
The meter he is using is usually used to sell useless AC filters (converts inaudible high frequency content to audible). Funny how it is being used now to show this thing actually makes things worse!Watch this Video to see how Bad it is. It makes everything worse.
Theres another Video where He is measuring on his Laptop, I dont think this is fake and this guy isnt really a big influencer from what I see, so no reason to make wrong claims.The meter he is using is usually used to sell useless AC filters (converts inaudible high frequency content to audible). Funny how it is being used now to show this thing actually makes things worse!
Read my post again. You completely misunderstood what I wrote.Theres another Video where He is measuring on his Laptop, I dont think this is fake and this guy isnt really a big influencer from what I see, so no reason to make wrong claims.
Oh i though you implied the meter is snake oil nvmRead my post again. You completely misunderstood what I wrote.
Now the question if their DC purifier does anythingAs I'm going through old threads I find new evidence. @amirm has already done measurements of the purifier:
https://www.audiosciencereview.com/...ts-of-schiit-yggdrasil-v2-dac.3607/post-87027
It won't do anything about common mode crap leaking through SMPS which may be a bigger issue than a small ripple.
In most cases I would expect DC fed devices to do some voltage rails cleaning/smoothing/regulation anyway.
I just ran into this thread and was looking over those plots. Funny thing, I just bought a Belkin 10 outlet with metal casing surge protector and was reading the box. On the back it says it has a EMI/RFI noise filtration from 150kHz-1MHz and up to -40db reduction.As can be seen it does nothing in the audible range (below 10kHz) acc. to their own plot:
No attenuation below 10kHz.
The active noise cancellation is a very old trick that was already used by JLH called the ripple eater.
This was for DC and did work in the audible band.
You can't do this for AC as that already consists of AC with lots of harmonics.
Funnily enough in their manual it shows a picture that shows 40dB noise reduction even at 1Hz.
This is a pretty nifty feat to suppress the 50/60Hz mains with 40dB.
One would normally call that a 100:1 transformer.
Now, I only bought this for use as an extension for my computer, printer, RMC, and Headphone amp.
Thank You for the reply and info, I really appreciate it learning something new every day.It will be fine for that. Aside from the surge protector there is a simple basic common mode filter inside.
Perfectly fine to use it for the intended goal.
The listed attenuatio and frequency range where the maximum attenuation will be reached in sounds realistic.
Well designed equipment and computer/printer etc. will also have at least basic but probably even more filtering inside anyway in order to pass EMC testing/regulations.
In general no one will ever notice the difference between filtered and non-filtered mains unless one has some serious (ground loop) issues going on.
And even there mains filtering might very well not be effective anyway.