Quote from PB on November 1, 2024, 2:54 pm

This has been a known issue for years and noone has ever said they have heard it, probably because it does not really start to rise til 19.5khz. The cause is the wiring/junction box of the tonearm

Quote from Drybonz on November 2, 2024, 4:12 pm

I've never heard this hum in years of listening to these rips.  I might imagine that I do now that I have read this, but I will put it out of my mind.  😛

Quote from Anders on November 2, 2024, 9:20 pm

Quote from PB on November 1, 2024, 2:54 pm

This has been a known issue for years and noone has ever said they have heard it, probably because it does not really start to rise til 19.5khz. The cause is the wiring/junction box of the tonearm

So you found out that this was the cause?

I remember that it was brought up before, and as far as I recall you said that you hadn't been able to locate where it came from, but I think I suggested that it was either the Sugarcube or your A/D converter, since the horisontal line at 20 kHz in the spectogram didn't appear until a certain year.

Quote from Isabelxxx on November 3, 2024, 10:15 am

Most people can't hear over 14Khz, specially +30s year old, so reports of people not hearing it is not an argument of 'it is not a problem'. Because other people may hear it. The same than HF EM noises by refrigerators, etc. which are really really annoying for some people (specially for those with higher sensory processing sensitivity) but other people don't even hear it.

Also, it's not like "normal" listeners may identify it. Even if you don't directly hear the noise, the same than <20 hz noises distort the signal in real speakers/IEMs, ultrasonic noises do the same. That's one of the reasons people are asked to filter SACD to PCM conversions HF noise, they simply destroy some tweets or add distortion in some devices (quality plays a factor here).

Just saying all this not with the intention "this is terrible", it's obviously not a really huge issue, but I think it should be addressed at some point. Glad to know that you are aware of it at least.

Quote from PB on November 3, 2024, 6:48 pm

I have been aware of it for years, it was never a secret

Quote from Aureoli on November 4, 2024, 2:27 pm

Could the presence of this noise potentially cause damage to high-quality speakers or headphones, especially if they are not designed to handle such frequencies? I appreciate the work being done here, and I’m asking out of genuine curiosity, as I am not very knowledgeable about this topic.

Quote from Drybonz on November 4, 2024, 11:08 pm

Quote from Aureoli on November 4, 2024, 2:27 pm

Could the presence of this noise potentially cause damage to high-quality speakers or headphones

The frequencies you are worried about are the ultra high range (I think people that are into DSDs worry about this, but I'm not an expert on any of this).  It's in a much higher range than 14-19, and you don't have to worry about this.  If you saw a graph, similar to the one above, that showed this potentially harmful range, it would look much different (these graphs exist if you want to hunt them out).