I recently upgraded my computer monitor to a koorui monitor and my amplifier I use for my speakers to a TPA3116 however when I plug it into my computer monitor audio output I get a horrible electronic stuttering wirring sound which is horrible for the ears especially when the audio is at a low volume. When I plug in the amp to my phone however, that noise is not there and there is a very soft hiss which I was expecting anyway. How can I fix the horrible noise from my computer monitor?
If you have much more gain than you need and if the amplifier has no volume control, possibly with an attenuator at the amplifier input.
Otherwise possibly by experimenting with the way the cables are laid out, or with a makeshift low-pass filter at the amplifier input, if it is due to out-of-band stuff being frequency converted to audio frequencies.
Is the monitor output a line output or a headphone output?
Otherwise possibly by experimenting with the way the cables are laid out, or with a makeshift low-pass filter at the amplifier input, if it is due to out-of-band stuff being frequency converted to audio frequencies.
Is the monitor output a line output or a headphone output?
Obviously, you have a grounding problem. Be sure the computer and Stereo are powered and grounded from the same outlet. You can isolate the grounds with various means but your computer should not have a voltage on the audio ground, nor a lot of safety ground current, or perhaps it is not grounded at all and is grounding through your amplifier.
You have a problem with the monitor power supply, ie it does not have a ground connection to the monitor, so the monitor is ungrounded. A ground connection to the monitor may help, but SMPS and audio gets messy. Your phone has no noise because it has no connection to ground. It may help to lift the amplifier ground. You have to break the ground loop somehow. But we still do not have the full picture. Does the computer not have a audio output? Grounding problems can be difficult, which is why some people resort to transformers and balanced in/out.
If these measurements are correct then that's your problem right there, those are way too high for line level signals. Forget this "it's the ground!" guessing game nonsense.