[Pc Engine GT] [Audio] Is it possible to improve it?

[ltpitt]

Hi all!

My beloved Pc Engine GT craves more fiddling 

I love its audio and I was thinking if it is possible to make it more crystal clear.

I hear a constant hum noise, can it be improved?

I've read about ferrites, seems like they are a very cheap way to filter out high frequency noise in your circuit.

My electronic abilities are very limited, can I ask your help / idea / suggestion in how to implement this?

Should I solder ferrite to the audio jack?

Maybe ferrites are a wrong idea, do you suggest anything else?

Thanks

[Keith Courage]

The hum noise can sometime be caused by using a junk power supply or low powered batteries. I've never really tried anything besides changing caps to improve audio quality on one.

[Winniez]

If its more noticeable when bright colours are shown it might be bad shielding in the cable aswell.

Edit:Sorry I posted hastily, didn't notice you were talking about the GT, just ignore my post.