Thomson upgrading

[Pjaska]

Hello! I am trying to get better user experience out of portable thomson 10 inch tv. Sound quality is really crappy and it goes in to 16:9 mode when connecting rgb from scart.
I took out the speaker and its 70mm x 40mm and 25 ohm. I dont know much about audio stuff but 25 ohms sound very high for me, i think they are usually 8?
Is it possible to trick tv some way to stay in 4:3 mode? Something like remove or manipulate 5v/12v rgb switch voltage or other methods?