Here is an issue I’m observing. I have the following connection:
Windows PC —DP—> KVM —HDMI----> Monitor → Speakers.
Sometimes, when computer needs to play a short sound, typically I notice this sending Telegram messages, instead of playing that short sound, the speakers just do a loud click. This does not happen all the times, occasionally, and also, I noticed that sometimes around the time this happens, there were no sound for some of the messages at all.
If I play something constantly producing sound (youtube, music, game), it works fine.
I used this scheme before with my old KVM (the only diff was the PC was connected to it using HDMI and not DP) and it worked fine.
This does not happen for the USB-C connection, though I connected a Mac laptops using USB-C, will try Linux one, but I don’t have Windows USB-C device.
I have a Blue Yeti USB microphone connected to the KVM, it acts as a sound device, and when I use it as an output - it works great. I tried to completely disconnect it and use HDMI as output - the issue is there, so it’s not a conflict between devices.
So, this makes me thinking there is some issue with the HDMI output.
Does your PC came have HDMI port?
If yes and please try switch PC connect to “HDMI in B” and then the monitor also switch to “Monitor B” port to have a test,this is straight HDMI connection.
I am afraid the issue caused by the DP in conversion to HDMI out issue.
I just connected the speakers to the headphones output on the switch, the PC detected AV Access KD-E10 output device, and it seems it’s working fine (I’ve been trying for a few minutes, but I think it was enough for the previous setup to reveal the problem).
Yes, the PC has HDMI outputs. I have to go now, I will try to do HDMI → KVM → HDMI tomorrow or the day after (depends on my free time), and I will report back ASAP.
When I used HDMI connection, it worked just fine.
When I connected it using DP again (this time I used the DP cable that came with the switch, the other one is also a good one, but to be on the safe side) - the problem appeared again.
So, it seems that’s the DP in conversion to HDMI out issue indeed.
Video card EVGA GeForce RTX 3080 Ti FTW3 ULTRA GAMING, Monitor - ViewSonic VP3268-4K.
Hi,
Thanks for your update and sharing the details.
Will submit to our engineer for a check.
In this case,we need reproduce this same issue in our lab so wen can try fixed it.
Will keep the eye in this issue and update for you if there have any news.
By the way, this would be take a some times due to we will start the Chinese Spring Festival holiday from this weekend and will back to office on 5th Feb.
Best Regards,
That’s right, once I connected the jack to the headphone out, the “AV Access KD-E10” audio output appeared in my devices (Windows PC and Macs). Sound works find thru this device.
Out of interest I have had this popping issue on two KD-E10 devices. I have now moved to a C10 and there are far fewer, and they are lower volume - but still present. This is using USB-C from a laptop (using the provided cable) and HDMI to the monitor (which is providing the speakers).
Exactly the same environment exhibits no issues for a $70 Anker dock - the only difference being the dock, it’s built in UCB-C connector for the PC AND that the PSU is a passthru of the original LG adapter.
I am suspicious of the AV Access PSUs as the source of electrical noise/static for two reasons. Firstly the KD-E10 has a pretty cheap PSU, and secondly the much better quality one on the C10 (because it is supplying 60W of power for the laptop) seems to generate far fewer issues.
I have tried isolating the entire config from the AV Access PSU using different UPS and surge suppressors with no significant improvement. This makes me think that the noise is generate in the PSU, or the KVM, and transferred to the output lines (HDMI in my case, DP in the OPs case).
As AV Access appear to make the ONLY laptop/desktop KVM, charging dock which offers shared wired ethernet I am going to live with these minor static/noise issues now they are not ear-splitting as they were on the first two KD-E10s.
Thanks AV Access for making the perfectly configured KVM/Dock for my needs - perhaps review PSU specs/noise suppression.
Update: The longer the device is switched on - the more frequent these pops. I’ve again A/B tested with the much cheaper Anker device and no issues (as expected). The UPSs are not reporting an supply events.
I am going to order a high quality USB-C (though I do not believe it is that, the provided one appears to be decent quality and is certainly no less quality than the pigtail attached to the Anker device). I will also swap in a videophile grade HDMI cable, though again the provided one seems fine. I’ll add ferrite to all cables in the chain BUT this still sounds like it is being generated internally to the signal chain of the KVM.
Hi Igor, Could you help share a source with short sounds to us and try have a test,due to we cannot reproduce this issue in our lab.
Appreciate for your sharing.
I was sending a short messages (“1”) to a chat, silent clicks are key presses. But you can also hear loud clicks (most of them are towards the end of the clip) - they are the click from the speakers.
If you open it in any sound editor (anything that visualizes sound), you will see noticeable spikes.