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2023/02/18 at 9:27 pm #111600
After some private communication with Keith at A&H, he provided me a link to this video: https://www.youtube.com/watch?v=go7mmyaj25I
After watching the video, I ordered the full speed, high current version of the USB Isolator from the company here: https://hifimediy.com/product/usb-isolator-high-current/
And much to my amazement, after connecting the device, the noise was completely eliminated so this problem is finally solved!
2021/04/10 at 3:43 pm #100598It’s too much; I’m just going to live with the noise, can’t seem to get rid of it after 4 pages of forum posts. Since the noise isn’t heard on the Zoom call, it’s not getting transmitted via the USB in, so as long as the caller doesn’t hear it, then I just can’t worry about it. It’s annoying to us to hear the whole time, but it seems like a no win situation. Thanks for your help though.
2021/04/09 at 6:34 pm #100583Yes, but, the laptop and USB was only for troubleshooting purposes. I don’t use the laptop with the USB, just the desktop.
If I put a DI box between the laptop and the mixer, will that work? Because the mixer is taking 1/4″ plugs which are unbalanced, right?
The laptop headphone output is a single mini stereo plug. So right now, I’m just using a Y cable that is mini stereo on one end, and L/R 1/4″ on the other end into the mixer.
2021/04/09 at 3:59 pm #100570I was just thinking about the direct box suggestion.
As I understand, the direct box is meant to go between an instrument and the mixer. How can this actually help if the noise is happening when no inputs are connected except for the USB? The box won’t correct anything since none of the inputs are causing the noise.2021/04/09 at 1:31 pm #100563trouble with the built in sound card on the motherboard, but it was audio output that was the trouble, I never tried the input.
It’s the reason why I’m using the sound blaster usb dongle for a sound card on the computer. I had long since disabled the onboard sound and just never used it so it is not relevant in the noise issue at hand.2021/04/09 at 1:04 pm #100560@mikec, I don’t understand a lot of what you said, e.g. analog, phase, etc.
In looking through the stash, I have a Samson MDA1 Mono Active Direct Box. Will that help? If so, where should I connect it?2021/04/08 at 11:10 pm #100547Ohhh you’re talking about the colored audio inputs/outputs on the PC, I got ya now.
Well, I suppose it’s worth buying yet another cable to see if it fixes the problem; I just need to test the line input on the sound card first to be sure it’s working because I always had problems with the audio out. I’ll report back on this after I get a chance to try..2021/04/08 at 10:57 pm #100545adjusting levels and bringing multiple things into one place is the purpose of a mixer, no?
The PC does have a built in sound card, maybe the line in works on it, I’ll have to check. If the line in works, then could I do what I said with an XLR to mini stereo cable?are you coming out the green connection on the front for audio then try the green or black one in the back and see if your noise changes.
What green connection? front of what? I have no idea what you’re referring to; My ZED10FX doesn’t have colored connections? You lost me here lol….2021/04/08 at 9:24 pm #100540The internal sound card on my motherboard has always been messed up so I’m just using this: https://us.creative.com/p/sound-cards/sound-blaster-play-3
Question – If you’re suggesting bypassing the mixer’s USB, and just sending the audio to the computer, couldn’t I just use an XLR to mini stereo plug cable (like this https://www.bhphotovideo.com/c/product/1237752-REG/hosa_technology_hmx_006y_1_8_stereo_mini_to.html ) into the mic input of the sound card I mentioned above? what is the purpose of the interface?
2021/04/08 at 9:09 pm #100538Keith, right, certainly don’t want to go through all the same troubleshooting and such again.. Submitted ticket #CKH-815-60891
2021/04/08 at 8:29 pm #100535Are you saying, you go out from the mixer’s Main XLR outs into this device and then from that device into the PC?
If not via USB, how does it connect to the PC so that the PC can see it as an input device in Zoom for example?2021/04/08 at 7:42 pm #100533What do you mean by “audio interface” exactly?
2021/04/08 at 6:47 pm #100530Keith, I had already isolated the noise directly to the USB. i.e., with only the USB connected to the mixer and to the desktop computer, the noise is heard (through speakers, or through the headphones)
It’s only when I connect the laptop (which is just for troubleshooting) to the USB and the ST2 from the laptop’s headphones out that the noise appears and is directly attributable to that ST2 from the laptop.
But with the desktop the same noise is heard with or without ST2 connected.
The first ST channel is audio output from a MIDI player. To get correct input signal level to the mixer, I have to raise it as shown, and yes they are both turned up at the sources.
As far as the headphone output on the laptop, there are no other audio outputs on the laptop, so I think I need to use that.
If I submit a ticket, I should just link to this thread I suppose?
2021/04/08 at 4:57 pm #100524When I plug the (ferrite bead) USB into the laptop, there is no noise at all when USB is activated as an input. BUT, when I plug into ST2 (from the laptop’s headphone out), the noise appears. Additionally, the volume of the noise is controlled by the gain on ST2.
Next, I had to drag the audio rack over so that the ferrite bead USB cable would reach the computer. I plugged it into a USB (2.0) port, and the noise was present. ST2 had no effect whatsoever on the noise in this case like it did on the laptop. I could unplug ST2 altogether and the noise is still there.
SO, my conclusion, still without a resolution here:
USB to laptop = no noise
USB to laptop and laptop audio to ST2 = noiseUSB to desktop = noise (whether or not laptop audio is plugged into ST2)
Also, USB 2.0 or 3.0 port made no difference.
2021/04/08 at 3:16 pm #100521Sorry, missed that. I’m not actually sure. I know the desktop machine has both USB 2.0 and 3.0 ports so I don’t know what type of port it’s plugged into atm, but I will check that.
I believe however, the laptop I troubleshooted with is only USB 2.0, but I’ll double check shortly. -
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