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Yeah, the crossing angle of the cables is important of course. I'm limited because the cables come parallel at the back, I've done what I can. The turntable is grounded and all possible ground loops have been avoided.
The noise was there even before I incorporated a DAC into my setup. The problematic chain is turntable -> preamp -> amplifier -> speakers. And I'm sure that the noise enters the system through the RCA cables between the turntable and the preamp.
Thanks to everyone for digging into this issue, but I considered it solved long ago. The current level of noise is low enough to be labeled as background. I'm only curious into finding if a filter like the measured on this thread or a cheaper one like many have shown could solve issues like this that present real listenable artifacts.
The following is more or less a guess based on the information that there is a cable bundle of rca and power cables.
In this case the noise possibly is generated by one of the power supplies of the devices, e.g. a poorly damped reonance that coupled into all cables. You would notice it in the turntable the most (or only) because that signal is most amplified. You'd likely also notice it in a microphone cable going to a preamp.
- The likely easiest way to fix it is to separate signal from power cables (running power cables close to digital is always discouraged, even in digital)
- If you cannot move the cables, an option is to put the phono preamp close to the turntable and run the hotter output signal in the bundle.
- Last resort would be to identify the problematic device and replace it.
I don't see many alternatives. A power conditioner may somewhat smooth the current that causes it but I'd be surprised if it fully solves it.
This would of course need further experimentation and I could be off but hope it is helpful..
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