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johnpaulgeorge
1
May 14, 2020
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I am encountering a hum at all volumes when source is connected through RCA. I am not getting any hum when connecting source through the front 3.5mm audio input jack with a double ended 3.5mm cable. When connected through RCA and humming, I can touch the 3.5mm jack with a finger and the humming will stop; likewise, if I put a hand on the source's metal casing, the humming diminishes/stops. I'm getting same results passing through an amplifier, as well as directly from the DAC. This makes me think it is a grounding issue - does anyone know a good fix for this?
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NeoTheLizard
108
May 15, 2020
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johnpaulgeorgeThis happens on two laptops in my home, but not on my desktop PC. What do you have the setup hooked up to?
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peterbonnesoeur
3
May 16, 2020
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johnpaulgeorgeOne way is, if you are using a laptop, to connect it to its power source. It will ground your pc.
johnpaulgeorge
1
May 18, 2020
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peterbonnesoeurI'm actually on desktop - in terms of cable connections, what do you mean when you said to connect it to its power source?
johnpaulgeorge
1
May 18, 2020
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NeoTheLizardHmm interesting, I have the issue on my desktop (no laptop for comparison).
For the setup without hum - I have a USB cable from tower to a Schitt Fulla (using its DAC) to provide power and audio source, then a 3.5 mm cable from Fulla to the front 3.5mm audio input jack of the Koss energizer.
For the setup with hum - I have an optical cable running from tower to Modi 2 DAC for audio source, then RCA cables to back of Koss energizer. I have also tried passing through 2 different amps and still have the hum.
In both cases I have the energizer wart plugged into a power strip. I have tried moving the energizer to different spots but this seems to have no effect.
NeoTheLizard
108
May 18, 2020
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johnpaulgeorgeWow, that is really strange. I would have imagined that keeping signal and power separate by using optical or coax would significantly reduce the likelyhood of issues like this happening, but now I'm even more confused as to what is causing it than ever before. In the case of the laptops I have the hum on, both were being connected to power sources while they had this problem. The one that belongs to me is almost 7 years old and won't last a minute using the battery, so leaving it unplugged is out of the question.
I'd imagine it to have something to do with the construction of the motherboards as well as the the power being fed to all the related equipment, but my practical knowledge of how these things work is pretty limited. It is kinda annoying that I can't use the system with my laptop without this issue, though.
Brahmsian
14
Aug 8, 2020
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johnpaulgeorgeMine developed a 60Hz hum only when I switched to iFi iPower X power supply. I have the audio input connected to my MacBook Pro's headphone jack. The hum is only present when my MBP is running on battery. It goes away when the MBP is plugged into the wall. Also goes away when I touch the MBP's chassis. Hum is not affected by volume. It is also present when the Koss energizer is turned off and also when audio input is not connected to the MBP. No hum issue using the stock power supply.
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