- Thread Starter
- #41
Very sad that I can't find any store locally . With taxes I am 99% sure it will cost me more that 30 euro to get it from ebay / china and it will stay at custom more than 1 month to be processed ..
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Ground Loop and pitched sound
- Thread starter tsine
- Start date
But this is one of the things DACs are not tested for at ASR...
You would need to inkjet Common mode currents /voltages in the USB input and RCA output to test for this kind of noise issue.
Some DACs have quasi floating (high common mode impedance) inputs or outputs (or both) and handel this verry well.
others just share the USB ground with the RCA ground direcktly.
My experience and the fact that this ifi (and toslink) thing exists sowed me this is a common problem in the real world.
OR a Usb to SPDIF.
Go optical in the DAC!
this is why optical exists
Its also why balanced connections exist. Unbalanced RCA effectivley came from a world when your sources and your amp were all close together, and the only long cables are the speaker cables which are not a problem since a passive speaker is never ground referenced. So problem of ground loops pretty much non existent.
The probelm here is relatively long RCA leads to the amplified speakers. Balanced connections have specificallly been created for long runs of line level signals with ground reference at both ends.
The probelm here is relatively long RCA leads to the amplified speakers. Balanced connections have specificallly been created for long runs of line level signals with ground reference at both ends.
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- Thread Starter
- #45
In my case if you read the replies ifi defender didn't work either . When I installed ifi defender plus a very high pitched noise introduced in the speaker and very prominent .
With ifi defeneder speakers sounded like the fake Devices promising to keep mosquitos away .
Do you now any dac having quasi floating to resolve this issue ?
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- Thread Starter
- #46
22 euros and with shipping 30 euros .....39 euros costs the asus xerox se locally if i go that route
I also saw that (just for educational purposes )
Does something like that degrades sound ? I read that can affect high frequencies and overall affect the signal
Is it similar to usb isolators or they use ferrite ?
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Sure the device is a rip off and did not work in most cases and it can cause other problems as you noticed.
Nevertheless it exists and it is marketed to solve this kind of ground loop issue.
Because its a common(mode
) problem. not from the top of my head. but some of the bigger more esoteric (expensive) dacs have USB modules with isolation
https://www.audiophonics.fr/en/dac-...mi-i2s-input-24bit-384khz-tcxox2-p-12379.html
I would not suggest going this way.
I would uses a (powerd) USB hub as a first try. sometimes this is all it needs.
if not as i said
USB to Toslink, Toslink to DAC.
If there is still a problem upgrade to a dac with balanced output.
If there is still problem uses Isolation transformer.
If its still there call ghostbusters.
There is some intermediate steps you can do:
[SOLVED] Ground loop between grounded Hypex NC400 DIY amp and ungrounded Denon 3700X
Okay, the new thing is the popping and clicking that even persists when disconnecting the hypex completely. I tried about everything: BIOS settings, energy management adjustments, latency analysis... I will try out some different HDMI cables and ports tomorrow and try out toslink for my TV...
www.audiosciencereview.com
Or Ferrites.
https://www.audiosciencereview.com/...measurement-and-comparison.27937/#post-970936
All this will Reduce the problem but the best and most effective step is to go Optical.
Upgrading the DAC to Balance is also a good idea but expansive and not by itself guranteed to be 100% effective.
Ferrites beads are ceap and won’t hurt (good practice if you know you have noisy PC/USB) but the only reduce the noise.
Isolation transformer are often very effective (the good ones) but the good ones are also expansive and the Lower audio quality significantly.
this is why they are only a last option.
don’t uses crap like this on a good DAC.
Your better of with a 10€ Apple dongle behind an real usb isolator (for ~10€)
ICQUANZX ADUM3160 ADUM3160 USB to USB Isolator Board Protection Insulation 1500V: Amazon.de: Computer & Accessories
ICQUANZX ADUM3160 ADUM3160 USB to USB Isolator Board Protection Insulation 1500V: Amazon.de: Computer & Accessories
www.amazon.de
That one is just a large ferrite and will only reduce the noise a bit - I know from personal experience. In my case as a rough estimate down to about 25% of the level wihtout it.22 euros and with shipping 30 euros .....39 euros costs the asus xerox se locally if i go that route
I also saw that (just for educational purposes )
Does something like that degrades sound ? I read that can affect high frequencies and overall affect the signal
Is it similar to usb isolators or they use ferrite ?
i don't think so.
normally this is how the cheap generic transformers for car "hifi" look
- Thread Starter
- #50
@
The cable looks like that but not gold plated . I guess this would have helped with noise but not.....
I saw the other thread and the cable with 7 ferrites on the usb cable ....
They say generally that ferrites(on analog signals not on usb cables ) also cut some of the upper high frequencies (affecting sound) maybe snake sience or something i don't know
My usb cable (one I use for d50s ) is from a printer i had and has ferrites to both ends (I though at the time it would be better than the one included in the d50s box )
The cable looks like that but not gold plated . I guess this would have helped with noise but not.....
I saw the other thread and the cable with 7 ferrites on the usb cable ....
They say generally that ferrites(on analog signals not on usb cables ) also cut some of the upper high frequencies (affecting sound) maybe snake sience or something i don't know
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So it does (having just looked up cheap generic car transformers). In which case it'll be even worse - I'd very much doubt it contains sufficiently wideband transformers.
Those sort of ferrites are typically added to help with radio frequency emissions, rather than audio frequency. I've recently learned (@
My usb cable (one I use for d50s ) is from a printer i had and has ferrites to both ends (I though at the time it would be better than the one included in the d50s box )
The cable looks like that but not gold plated . I guess this would have helped with noise but not.....
I saw the other thread and the cable with 7 ferrites on the usb cable ....
They say generally that ferrites(on analog signals not on usb cables ) also cut some of the upper high frequencies (affecting sound) maybe snake sience or something i don't know
) that they can provide limited attenuation of higher audio frequencies, but are unlikely to solve your problem here.- Thread Starter
- #53
Monday will be my last day for decision . Also i found locally these types of ferrites for 1.20 euro 5mm 7mm or 13mm in diameter .Those sort of ferrites are typically added to help with radio frequency emissions, rather than audio frequency. I've recently learned (
They will have limited impact on your noise. See the link posted above by @Lambda for the ammout of attenuation you can get by putting multple (7 or so) ferrites onto a single cable.Monday will be my last day for decision . Also i found locally these types of ferrites for 1.20 euro 5mm 7mm or 13mm in diameter .
My advice is to stop trying to find workarounds, bite the bullet and get an optical connection to your DAC. It is the cheapest and most effective solution for you.
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