Actually, I study the owners manuals online of products I am considering purchasing. My brother says the owners manual/assembly instructions are just one engineer’s opinion. My brother breaks things a lot.
Any one measured the EMI/RFI attenuation performance of audiophile power conditioners?
Hello,
I was looking for a very good/robust power conditioner which will clean up reliably very noisy/dirty power supply that I have in my aprtment. While looking for one I went through catlogs of AudioQuest, Shunyata Research, Synergestic Research etc. but no one published charts showing attenuation performance over frequency range like you get for EMI filters from Schurter or Schaffner etc. which are in the industry for EMI/EMC compliance.
Since audio is very subjective, but contrary to audio reproduction Power and EMI/RFI reduction is completely objective and can be clearly demonstrated via attenuation charts.
Hence I am asking if anyone has measured the actual performance of these audiophile power conditioners. I am not denying someone saying they hear improvement after using XYZ product, but since I am talking about power conditioning or EMI reduction it's as objective as it can be.
I am not at all surprised to see all the manufacturers not publishing the performance data, else it would be used in other industries and research fields where it's far more critical and have far more stringent requirements on the performance of conditioner/EMI filters. But I am shocked to see even products ranging above 5-10K are following the same practice of not publishing the results.
Please note I am not a measurement fanatic, but I know where I can chase the measurements and where I can rely on my hearing to gauge the difference.
Regards,
Audio_phool
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@audio_phool you answered your own question. While data might be useful to customers, it will not be beneficial to the manufacturers unless they have top/best measurements. In fact, it’ll create more work (accumulating data, publishing data, answering data related questions) and likely loss of sales/revenue to do so. Also, many claim to “lower noise”, but it may not be exactly/simply the same as specifically “EMF/RFI” like you are interpreting | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
@tonywinga Thank you for pointing out the user manual part. Now I have created a table of values for EMI/RFI Noise reduction based on available/published spec. Took me some time to gather all info. But I think its a worthwhile exercise.
For any Power conditioner/Filter, it’s primary function is to reduce EMI/RFI noise on the mains line. Hence it’s objective performance is of high importance here. Now the performance of this noise filtering is evaluated based on the following parameters. 3. Mode :- EMI/RFI noise attenuation is measured in two modes Differntial Mode (DM) which is measured between live (hot) and neutral (cold) line (differential currents flow in opposite directions through the source and return path) and Common Mode (CM) which is about noise that flows in the same direction in a pair of lines (common mode currents flow in the same direction through the source and return path, completing the circuit through the ground path). Typically DM noise reduction values will be higher than CM mode values at a given frequency value & at the same load value. In both cases having higher values is desirable. @kennyc Yeah, now that you have pointed out, I can see that I had already answerd my own question. The table above puts hard facts around it. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
I am adding a separate column for frequency range specified/mentioned.
This will give a complete set of info which is as available on the product page/in manuals. So as the anlysis of these figures availble, I can conclude that for most of the audiophile grade power conditioner manufacturer, the available specs are usless as they do not tell the whole story except for the Audioquest which tells specs only at Lab specs & not the real world scenarios. The only one to stand out of all these is EMI Filter by OnFilter, as they provide data for real world values instead of just Lab setting vaues & their performnce is very impressive indeed and that too at a lower price than all other audiophile counterparts. Audio_phool | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
That's why it pays to test components in your own system.
Criminal? Really? Good luck to you as you try to warp the law to suit your opinions. |
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