I like to hack the radios to add new features or to enhance the features already existing.
After playing a while with the G90 I found necessary to have an external speaker because the internal one, altough really loud, it lacks low frequency response.
I do have some amplified speakers but I don't want to complicate the setup so, more gain was needed.
Therefore, I opened the Main unit of the radio and start looking inside.
I replaced that with 3 10 Ohm in paralell to have some sort of
load in case we shortcircuit the HP Jack. And this is very probable because the signal is going to the tip and to the ring of a stereo 3.5mm Jack.
Now the radio has external speaker without too much trouble.
Because I am using modified Kenwood HS-5 Headphones the audio level is OK.
73 de Adrian yo3hjv @ December 2020