long ago i had this speaker, which i tried to repair at that time but couldn't. I threw away the circuit of this speaker considering it to be useless, now when i got into electronics i wonder i could repair that old speaker but then i remember that i have actually thrown away the circuit :/
by little bit of googling i have only gather few information about it
1. It uses Class AB amplifier.
2. There are two TDA 2030 IC and one 4558 IC.
3. It uses 12 volt dual power supply
4. It has two channel each of around 17W and a subwofer of 30W.
5. Its model is R201T06.
If anyone of you have a schematic of this circuit or have an idea of how i can rebuild the circuit will be very grateful.

 

Maybe fastest way is one of these -

https://www.banggood.com/search/audo-amplifier.html

Regards, Dana.

 

Don't waste your time , the TDa20** series chips have poor audio output , there are far better chips now with louder output and better quality.

Tda2020/50 circuits

https://www.electroschematics.com/1192/tda-amplifier-circuits/


TDA audio book.
http://320volt.com/en/tda-serisi-anfi-entegreleri-dokuman-designers-guide/