[plachta]

Hello,

could anyone please help me with my problem with DAC Questyle CMA 400i? My dac making "electric" buzzing/noise/brum/hum (I do not know right word for this noise). I think it could be toroidal transformer or something in powering the dac.
have anyone noticed this? I can hear it pretty much in the night whwn everything is quite only my studio monitors and pc going. I have the dac om my desk about 40 cm from my head. When i put my ear close to dac, then it is very "loud" sound. For example it is 5-10 times more loud and more anoing then standard noise from studio monitors.

I found some threads where someone says it could be low grade power cable. I have low end basic power cable (it was bundle for dac). Someone else says it can be removed by some filters (but they cost a lot).

I am finding any "not expensive" solution.

Thanks wery much for every help and information on this my problem.

 

[Monsterzero]

You need to do a series of trials to determine whats causing the issue before throwing cash at it.
I would suggest:
A different power cable,perhaps borrow one from another device in your home.
Try a different power outlet.
Try a different outlet in a different room
Try turning off other electric devices in your home(lights,air con,etc...)
Try a different USB cable from your computer

Theres probably other free things you can try,but thats off of the top of my head.

Good luck.

 

[plachta]

Hello,

thank you very much for yours advices. But nothing from that did not work. I tryed 2 different power cables in all my rooms and even without usb cable and without signal cables to monitors. Everything was turn off. Still the same "brum".

 

[Monsterzero]

I would post your question in this thread:

https://www.head-fi.org/threads/new-questyle-cma400i.851737/page-62

See if other owners have experienced the same issue. I cant really offer any further advice as I have not owned the 400i