Again, not ideal and the problem is apparently very common with many types of laptop. Sound card is defective: get a new one, or buy an external sound mixer. However these only seem to be available for analogue audio wires, not USB. Apparently USB cables have a ground wire in them - is there some type of USB adapter I can get to disable it? Or some other type of USB adapter which will solve the problem? I saw this suggested in a thread, but I haven't found any other examples of people using one to fix this problem. This is not ideal though - power surges can fry the laptop battery, and touching certain parts of a laptop can cause electrocution. Use a 3 prong to 2 prong power adapter to remove the ground. One explanation I found is that is that every component in a laptop shares the same ground (earth), and other appliances on your power circuit cause feedback on the ground which leaks into your microphone/sound card.Īnother explanation is that badly shielded microphone/headset cables can contribute to this - but that may only apply to analogue (3.5mm) cables, not USB, according to some threads I've read. When you unplug the power supply (and run on battery) the noise ceases. The AC power supply on a laptop can cause a loud buzzing/humming noise on the microphone or line in (either USB & analogue audio connections). Does anyone have any experience with solving this? Information - Concerts, News,FAQs, Archives. Organs - Electronic (B3 etc.), Pipe, Theatre. Who's Who - Professional Pianists on Piano World Member Recordings - Non Classical Pianist CornerĮVENTS! Piano Concerts, Recitals, Competitions.įun Stuff! - Parties, Tours, Projects & More.įorum Members Parties, Tours, Cruises, & M. MY NEW PIANO or KEYBOARD! - Share Your Story! I think having a separate USB connection to motherboard and then line outs coming from MOTU - which is only connected by USB to NUC must have enough isolation for the ground loop to go away.ĭigital Pianos - Electronic Pianos - Synths &a. I don't know if the ferrite cores make a difference, but I had the better cable lying around, so why not. If this doesn't work with the NV-10, I'll still have the traditional midi option to replace the USB-cable between the NV-10 and the NUC. MOTU M2 line outs -> Roland LX-17 line-in (using a 2x mono jack 6.3" to 1x stereo jack 3.5") NUC -> MOTU M2 (with the supplied USB-C cable which I'll probably replace later) Roland LX-17 -> NUC (with USB, the cable with the ferrite cores) In addition to using the M2, I have also replaced the el-cheapo USB-A->B midi cable with a much better one that has a ferrite core at each end. (I got a USB interface with traditional midi because the NOVUS NV-10 also has it, so I would have another option to try and avoid a ground loop.) It does have traditional midi and I have an NV-10 on order, which also has it. The Roland does not have traditional midi out. I connected the NUC to the Roland by USB for the midi, and the headphone out to the Roland's line input. I had a ground loop between an Intel NUC and an LX-17. Https:/ / sh/ qo0q6kzqd4t7vlr/ AABYS4J2hwE6qfuN1XitEe0ga?dl=0 Hopefully someone will know how to interpret them even better. Here's a link to the RoomEQ measurement files. Now here's a plot of the distortion on the bare audio cableĪnd finally distortion on audio cable + aukey isolator + another audio cableĬould you hear some small distortion in A0 through D#1? I'm open to placing wagers on double blinded tests that you cannot. Note, the absolute SPL levels are meaningless as I'm not running this through a (calibrated) mic, so there's no actual sound pressure. I set the left edge of the graphs to 27Hz, which is just below A0. Then after taking that measurement, I added the Aukey ground loop isolator I linked to above, and the even cheaper audio cable it came with to the setup. It was probably $2 at Radio Shack 25 years ago. I used a cheap Behringer UCA202 as an audio interface, and took measurements with Room EQ Wizard, first with just a plain audio cable between the input and output. In hopes of strangling this audiophile paranoia in the crib, or at least preventing it from spreading any further than necessary, I actually went and measured the effects of my $11 isolator. They directly attack the physical cause of the ground loop. While, yes, the isolator will technically cause some filtering, they're not 60Hz notch filters or something. I don’t favour putting any sort of filter on the audio line since that’s likely to mess-up the sound and will only attenuate the noise rather than eliminate the ground loop that’s actually causing the noise pick-up.
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