Greenwave AC EMI Meter - What are your results?

[Ghoostknight]

Hello, i actually should have bought this thing way earlier, as i just found out my electricity is one of the worst

measured at day-time without filter: 1980mV (actually the cap of the device i think as i never see it go beyond 1981)
measured at night-time without filter: 1200mV

all following values are measured at day-time:
measured at day-time without filter: 1980mV
1 greenwave filter : 1600mV
2 greenwave filter : 1200mV

at night, with 2 greenwave filters plugged into a black lion audio PG-P power distribution unit im down to 120mV

i wanna create this thread so potentially people can share there results, so we can see what filters are most effective in the lower frequency range (the greenwave ac meter measures from 3kHz (audible range) to 10mHz) as imo from tests the lower frequency range is the hardest to get rid of
some filters, while they are effective above 10mHz dont show a difference with the greenwave ac meter, while this is a possible technique "to make the greenwave filter look better than others" imo they have a point with focusing on the harder to filter lower frequency range

 

[Somafunk]

Jesus help us……., forget about your utterly pointless subjective audio tweaks/experimentations as they are all utterly bollox , go study electrical/electronic engineering at college or university

 

[Ghoostknight]

Jesus help us……., forget about your utterly pointless subjective audio tweaks/experimentations as they are all utterly bollox , go study electrical/electronic engineering at college or university

its people like you and "science" making the audio space a bad place to start out in

i tried to be objective as i started out, but if you heared the differences of specific tweaks (power supplies, op amps, dacs...) you can either simply deny it or go further and search for the reason

imo the greenwave ac meters are great way to get some objective results without much "guessing" (which makes the subjective side for a lot of people uncomfortable, simply because they dont trust themself i guess)
for example, i just switched up the positioning of my available filters and two greenwave filters placed right at the entrance where also the first power socket is reduces values from 1980mV to 600mV in the whole room (where placed on the last socket it would probably have little impact at all)
impact on music was quite dramatic

will get two more greenwave filters now, not because im sponsered or anything but i simply find them to be one of the most effective for the price...
but i also have some isotek Evo3 coming which got quite good reviews on Alpha-Audio with some measurements

i also just found this somewhat "esoteric" solar installation filters https://shieldedhealing.com/products/power-perfect-box-solar?variant=15628105056313
someone got there levels from 1980mV down to 150mV on youtube (in the whole house!), which might be really worth considering

 

[Somafunk]

its people like you and "science" making the audio space a bad place to start out in

Ok, walk into any university with your ideas/theories/tweaks/suppositions and see how far you get.

We know about audio signal processing and propagation of sound waves through rigorous scientific beliefs.

The trouble I have is folk will see your experimentation and think there must be something in it

 

[Ghoostknight]

The trouble I have is folk will see your experimentation and think there must be something in it

and some can hear the difference and others dont

 

[Somafunk]

You do realise that human hearing is fallible and sighted bias accounts for 100% of what you post though

 

[Ghoostknight]

You do realise that human hearing is fallible and sighted bias accounts for 100% of what you post though

It is, that doesnt mean one should disregard it completely, specially if you learned to listen critically over a longer time and have some expierence what tweaks can do and what to listen for
for example, in regards to correct absolute polarity it heavly depends on the test track and even then i didnt got 10/10, but consistently 7-8 out of 10, something science claims to be inaudible...

and sighted bias accounts for 100% of what you post though

well that is one -possible- explanation, some take it as guaranteed i guess

You do realise that human hearing is fallible

who says blindtest aren't ? just because 10 people "cant hear anything" doesnt mean its not there, specially the case as with this ac meter


https://www.sciencedirect.com/science/article/abs/pii/S1120179716308766

It is needless to say that no matter the effects of these EMF be trivial or catastrophic, we should take all the necessary precautions to reduce our exposure to EMF as low as reasonably attainable

 

[Somafunk]

who says blindtest aren't ? just because 10 people "cant hear anything" doesnt mean its not there, specially the case as with this ac meter


https://www.sciencedirect.com/science/article/abs/pii/S1120179716308766

I checked out your link above, this is all it returns below, a total of zero citations since publication….whatever reinforcement bias you wish to engender by posting such spurious information does not come anywhere near to evidential proof

Since the beginning of the 20th century, we are overwhelmed by the increasing sources of the Electromagnetic Field (EMF) that is coming from telecommunication, electricity, appliances, medical equipment, and many other apparatus that we use in our daily life. Although these new technologies became inevitable and indispensable, the EMF they produce may cause health risks and hazards to human.
Some studies show a link between exposure to EMF and increased rate of Leukemia, cancer, brain tumors and other health problems. Also, there is some uncertainty remains as to the actual mechanisms responsible for these biological hazards and which type of fields magnetic or electric or both are of great concern.
It is needless to say that no matter the effects of these EMF be trivial or catastrophic, we should take all the necessary precautions to reduce our exposure to EMF as low as reasonably attainable. For this to occur, all those involved or affected by this exposure should follow the RF safety standards and guidelines set forth by the regulatory authorities like the IEEE, WHO, ICNIRP, and other likewise organizations.
Any failure in taking immediate actions to the above guidelines, the public would be at a high epidemic risk of potentially fatal diseases in the future.


That was it, in total a big nothing burger

 

[Ghoostknight]

whatever reinforcement bias you wish to engender by posting such spurious information does not come anywhere near to evidential proof

do with it what you want, luckily we are in the DBT free subforum

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i did a bit more of experimentation (as filter placement seems to be everything, you can either buy 4 filters and place them suboptimally or buy 1-2 and place them right and get the same results) and i think i got some valuable insights out of it...

every power distribution with built in "IN SERIES" filtering ala your usual 1/2/3 stage emi filter will pretty much suffer from this, this circuit isnt "filtering noise" its "blocking" it! very subtle but extremely important thing to understand
think of it like a "wall" for noise, its basicly reflecting any noise that comes in (or wants to go out) .... but imo the crucial part is the noise that is "contained" (from devices plugged into the power distribution) stays contained inside the power distribution if you dont give it a path to "flow out" (the easiest solution seems to be using some big caps from phase to a direct ground path, as used in the greenwaves filters)
one greenwave filter plugged into such a power distribution has quite a dramatic effect

- imagine a power distribution with a PC plugged in, measured values are 1600mV (up from 400mV because the power distribution unit is blocking the incoming 2000mV)
- one greenwave filter placed here will bring values inside the power distribution unit down to 400mV from 1600mV again, simply because now there is a direct path for noise to flow out of the direct ground connection trough a appropiate sized cap (the greenwave filters are one of the filters that have very large caps, the larger the cap the more lower frequency noise gets filtered)

there are also these filters: https://auth-nt.de/produkte/netzfilter/adapter/1/netzfilter-emd-503?c=19
these have a additional filter on the ground line (basicly acting like a wall for noise, even the noise that wants to flow out trough ground, think of the device that is plugged into this filter as somewhat "floating", noise will stay contained inside the device)
it seems useful for filtering "specially" noisy components, as these cant contaminate your remaining circuit then, but in my mind it cant be good if the noise keeps "floating" around without giving it a path to actually flow out of the system
this was specially obvious with placing 2 greenwave filters right at the entrance of the room where the first power socket of the circuit was, placing those there actually filtered noise out of the whole circuit (as it was the easiest path for the noise to take back to ground) if you place the filters for example at the last socket then the noise "travels" to the last socket to actually flow back to ground, on its way there it will contaminate all devices


2 days of experimentation with this ac meter gave me more insight than a few years of actual listening, imo that is a big pro and definitely worth the 200 euro
i also hear some correlation between lower measured values and sound quality