Setup:
- plugged into a single outlet via a power strip are:
- 1 PC
- monitor #1, connected to that PC
- monitor #2, NOT connected to PC in any way (other than sharing a power outlet)
- 2 speakers (sharing one power cable and audio cable)
When the speakers are connected to the audio output of my PC (via a 3.5mm jack), they are totally silent when no sound is playing. They are also silent when plugged into a laptop that's sitting on my desk.
But when I connect the same speakers' audio cable to the audio output of monitor #2 and switch them on, a deep but loud noise can be heared coming from the speakers.
What I tried so far:
1. Overview of complete setup with monitors #1 and #2, PC, speakers, two outlets, and one extension cord. Including:
- dark blue power cables
- light blue audio cable
- (grey video cable)
- red cable is the speakers' power cable when I tried a different outlet
- red cross is when I tried to disconnect monitor #2 from power altogether
Image: View: https://i.imgur.com/2CXe4Us.png
2. Screenshot of Spectroid app, when monitor #2 is powered.
Image: View: https://i.imgur.com/OlTpmPo.png
3. Screenshot of Spectroid app, when monitor #2 is not powered.
Image: View: https://i.imgur.com/2CFfDCW.png
To reiterate, the simplest setup where the noise occurs is:
Thanks in advance for anyone who can point me in the right direction!
- plugged into a single outlet via a power strip are:
- 1 PC
- monitor #1, connected to that PC
- monitor #2, NOT connected to PC in any way (other than sharing a power outlet)
- 2 speakers (sharing one power cable and audio cable)
When the speakers are connected to the audio output of my PC (via a 3.5mm jack), they are totally silent when no sound is playing. They are also silent when plugged into a laptop that's sitting on my desk.
But when I connect the same speakers' audio cable to the audio output of monitor #2 and switch them on, a deep but loud noise can be heared coming from the speakers.
What I tried so far:
- It does not matter whether monitor #2 is turned on or off. It doesn't event matter whether monitor #2 is powered at all. Right now that monitor is completely switched off and the only cable connected to it goes directly to the speakers. Although the noise is more intense when the monitor is powered as well. (see screenshots)
- I tried connecting the speakers to a different power outlet than everything else. Same outcome.
- I tried unplugging the speakers from the monitor, keeping the cable in the same position, and instead connecting them to my mobile phone. I thought that maybe the cable's position somehow caused the noise. But with that setup, no noise was heard and they worked fine. Switching back to the monitor, the noise came back instantly.
- I tried all of these with actual music playing, and the music was just barely audible behind all that noise.
- I also used some headphones, connected them to the monitor's audio output instead, and there was no noise at all. Music playing could be heard without problem.
1. Overview of complete setup with monitors #1 and #2, PC, speakers, two outlets, and one extension cord. Including:
- dark blue power cables
- light blue audio cable
- (grey video cable)
- red cable is the speakers' power cable when I tried a different outlet
- red cross is when I tried to disconnect monitor #2 from power altogether
Image: View: https://i.imgur.com/2CXe4Us.png
2. Screenshot of Spectroid app, when monitor #2 is powered.
Image: View: https://i.imgur.com/OlTpmPo.png
3. Screenshot of Spectroid app, when monitor #2 is not powered.
Image: View: https://i.imgur.com/2CFfDCW.png
To reiterate, the simplest setup where the noise occurs is:
- Speakers plugged into power outlet and switched on,
- speakers connected via audio cable to monitor,
- that monitor not connected to anything else, not even the power supply.
Thanks in advance for anyone who can point me in the right direction!
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