Looking for an external remedy to eliminate high frequency static noise that I believe is generated from Class D integrated amp (output stage?). I don’t want to give up on the attributes of Class D but the intermittent distraction is causing me buyers remorse. Open to suggestions (not purchasing Class A’s). TIA.
EMI generated from my Eigantakt Class D Amplifier
- Thread starter bornie
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Is the noise still there when you turn off youre mobil cellphone and other wireless stuff.
I'd experiment with something like this on the inside of the case, in areas you think might reward you. I've read of a number of people doing this sort of work on the PS Audio forum discussion of their Directstream DAC MKI, but the thread is soooooo long it might be hard to find info about the materials they used.
If you'd like to search: https://forum.psaudio.com/t/modding-the-directstream-dac-mki/2680
Edit: Here's a likely better link: https://forum.psaudio.com/t/emi-rfi-absorbers/5043
If you'd like to search: https://forum.psaudio.com/t/modding-the-directstream-dac-mki/2680
Edit: Here's a likely better link: https://forum.psaudio.com/t/emi-rfi-absorbers/5043
What is the mechanism where you see the high frequency noise?
Is it noise or static?
There is the resonant frequency that the class-D runs at, so it is something like 750 MHz (or whatever).
That is either sneaking out of the power line, or being emanated out out of the cables, or via the ether.
And then…
What is that coming into where the noise shows up?
I use a battery powered portable AM FM radio to help find EMF sources, tune it into No station (static) and wave it over the suspected object. Try both AM & FM bands, it helps if the radio has no self tuning chip, so an older or basic radio is actually better here.
Wave it over a cell phone charger, and hear if it sounds like a good idea to sleep right next to it. Most people don't care though.
Wave it over a cell phone charger, and hear if it sounds like a good idea to sleep right next to it. Most people don't care though.
The audible buzzing/static noise suddenly appears thru the tweeter & midrange on my Von Schweikert VR55’s. The bass drivers are managed thru internal Class D’s and are not affected. I’ve change Power & Speaker Cables and ran power thru a different wall outlet.
WOW, that’s interesting!!!
I honed in on your description of “intermittent“.
You may want to investigate whether an appliance in your home is running when the noise is present. Such as your furnace or refrigerator or power vent water heater, etc. basically, something with a motor.
You may want to investigate whether an appliance in your home is running when the noise is present. Such as your furnace or refrigerator or power vent water heater, etc. basically, something with a motor.
Thanks! Isolation might be the key… perhaps a thin layer of lead around the “box”… Today I’m going to try a power conditioner, just because, to see if it’s introduced on/in the AC line.
That is not likely to be a class-D amp problem.
Any “sudden” thing seems more like RF coming in through the RCAs or power… especially if it the zzzt-zzzt-zzzt of a cellphone handshaking with the tower.
The speaker cables are generally looking at a low impedance, but it is hard to say up at RF.
^this^
If it is really up in the tweeter range, then it is hard to imagine it might be a motor… but any inverter type of controller would certainly be able to get up to the tweeter range.
If it were “sudden” and always in the evening, then I would be looking for a HAM radio station nearby.
And/Or looking at using XLRs…
Republicoftexas69
Well-Known Member
I have also seen here on this forum that some folks will affix a small strip of this material on there IC and Power Cables to reduce RFI. As a bit of a tweaker I will get around to this even though I am not suffering any of these symptoms, that I am aware of. Some time implementing a fix will reveal having an issue you were oblivious to.
Awesome!!! I
Awesome!!! I have an electrician due in, in a week or so! An EMF meter might be in his tool bag!!! If not, I’ll purchase! Thank you!
This is a known also they are apps for phones for EMI
You can also you a scope ground to each device then use the probe
And wave it over devices .
now where the noise you hear is complex in itself . You can find noise but this doesn't mean it's effecting your system.
Do you have tubes anywhere ?
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