TOPIC:

Hi,
I have noticed a constant whistling tone in my speakers at around 4300Hz when using my SHD regardless of input source. I have previously used an active speaker in the top (HEDD05) but not noticed this tone before. My new speakers are passive and driven by a NuPrime ST-9 connected to the SHD with XLR cables.
Would welcome any ideas about how to solve this.
Best,
/Stefan

That's pretty weird. If it were me I'd identify whether it happens regardless of input, and whether volume changes anything. If it happens even with nothing is connected to the SHD inputs and it doesn't happen when the SHD is disconnected from the NuPrime then perhaps take an RTA of it and open a support ticket?

Partially solved by using RCA cables instead of XLR! A bit strange since balanced cables should be more resistant to noise and hum. It is only my ribbon tweeters that pick up the tone (4300 Hz). My AMTs do not. Well, good enough for me anyway.

@closer2000

That's extremely weird to say the least.. We're talking of circa 120dB SNR on that unit with no peak anywhere near that frequency.. we've also never heard of any issues of noise with the SHD... I think it's generated by something else somehow... Did you start a tech support tix with our team already?

DevTeam

No, did not open a ticket. Since the 4300Hz tone only appears with my ribbon tweeters and via XLR out from the SDH to a pair of bridged NuPrime STA-9 I think this is too unique. RCA or XLR to a pair of HEDD05 (studio monitors with AMT treble and builtin amplifiers) generates no tone. However listening to the SHD itself in a very quite environment there seems to be a tone around 4300Hz. Maybe it is generated by the display; would love to have an option to switch off the display

Anyway, I am happy as a lark for my SHD. It really lifted my listening experience and it really is fun to tinker around with filters and levels and of course the mighty Dirac algorithms. Best audio investment since I bought a pair of Jordan Watts speakers in the mid-70s (my first speakers ever)!

Thanks for the feedback!
I don't think that it's the OLED (else we'd see it in the measurement on an Audio Precision), aka some peak.
Have you tried to use XLR to XLR but not have the shield connected on one side? That might do the trick if you have some shielding issue.. Just a thought.

Glad to hear that you're enjoying your unit! Thanks a ton for your nice feedback. It means a lot to us.. If you get a chance to write a little review on product page, we'd be super grateful..

DevTeam

Sorry to necro this post, but I'm having the exact same issue with a brand new unit. Depending on what I'm using for downstream equipment, I get the squeal in either the balanced or unbalanced outputs but not both. It is not correlated with the gain setting on the SHD. When using the unbalanced outputs, I also get hum if there is no other preamp / attenuator between the SHD and the amps.

The squeal / oscillation is loud enough to hear during quiet passages particularly if I'm not using another gain stage. No good. I've disconnected all other stuff (USB, network, etc) with no change, and tried plugging the unit into different circuits which typically made it worse. Not sure what else to try, but I'll put in a ticket.