Question about my board from AliExpress

Hello everyone, I bought this board from AliExpress a couple days ago and the configuration printed on the silkscreen except the power capacitors which were 4700uF instead of 2200, gave me pretty good results but I think I can improve further. I would also like to know how the PCB is configured for power, is it single or split? What about a TDA20XX? I only have a 14-0-14 100VA transformer and would like to get the best sound clarity with a flat response. Thanks a lot!
 
One way to improve the sound quality of a chipamp is to reduce the power supply noise it generates. Which, in practice means lowering the impedance of its power supply. This may be done by increasing the supply capacitance, I've gone up to a hundred thousand uF or more on some of mine.