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High frequency noise on Kronos analogue outputs

 
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Purusha
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Joined: 07 Apr 2006
Posts: 167

PostPosted: Wed Oct 21, 2020 11:33 am    Post subject: High frequency noise on Kronos analogue outputs Reply with quote

All,

Has anyone else seen this? If I use a spectrum display on my DAWs, Kronos seems to exhibit a constant spike at around 20KHz.

Digital output is (not surprisingly) OK.

I've tried a USB opto-isolator, but no difference. Any thoughts?
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Gunnar
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Joined: 27 Jan 2016
Posts: 184
Location: Norway

PostPosted: Wed Oct 21, 2020 12:44 pm    Post subject: Reply with quote

Yeah, I see the same thing when I connect the Kronos to my Focusrite Clarret 8pre and then into the MacBook.

It is outside the audible spectrum* though and very low** so I just ignore it Smile

*) I have two peaks, one at ~15kHz and one at ~20kHz, and while cats and dogs might be annoyed at that, the average human will not. Surely not if they are above 15-20 years of age at least. 15kHz is debatable of course.. I can hear that faintly, but see next point.

**) I measure mine at about -90dB, which is really low.. so it while it does show on the logarithmic scales, it is not something one can pick out. Working with a noise floor of perhaps -60-70dB, some high-frequent noise at -90dB is acceptable.
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Gear: Korg Kronos 2 73, Arturia Microbrute & MiniBrute 2, Moog Mother-32, Ibanez RG320DXFM Guitar, ESP Viper 254FM Bass, Blackstar HT-1
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Purusha
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Joined: 07 Apr 2006
Posts: 167

PostPosted: Wed Oct 21, 2020 1:08 pm    Post subject: Reply with quote

I'm thinking for studio work - don't use on-board delays and reverbs, then use a noise gate on Kronos inputs.

Still irks though.

If Kronos would work with multiple sample-rates, it probably wouldn't be as much of an issue.
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Purusha
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Joined: 07 Apr 2006
Posts: 167

PostPosted: Wed Oct 21, 2020 1:20 pm    Post subject: Reply with quote

I'm not seeing a 15KHz spike btw. Just the 20KHz.

...and a smaller USB spike at 7300Hz (could cure by disconnecting USB, or by using USB opto-isolator).

The 20KHz spike is showing at about -75db. Over-all, noise-floor is at around -88db.

I could add though, that none of my other kit has this effect.
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