Amplifier on TDA2030A: better 12 or 15 volts?

Question

Electronics

Repairing speakers. Everything is cheap and dilapidated - the transformer is gone, because the wires have become brittle. The original was 13 volts. I will take the one that fits. Which is better to take: 12 or 15?
Circuit - amplifier on TDA2030A.
Speaker impedance - 4 ohms.

Answer 1

Ok Google datasheet TDA2030A https://www.st.com/resource/en/datasheet/cd00000129.pdf
We look at the power: plus or minus 22V, i.e. 44V max. So 12 or 15 - it doesn't matter, as long as there is enough radiator, because. more supply voltage - more power - more heating - you need a larger radiator.

Answer 2

I recently collected from what was at hand, on this microcircuit, the trance was also installed, it came out about 12.5V - it works, but the sound quality is not very good. But I needed it purely for a small subwoofer, that was enough. But I plan to wind up the trance at least up to 14-15V, there is room for another 1 layer. According to the scheme on the Internet, for a unipolar power supply (the datasheet requires bipolar, of course), you need 18V (according to other sources, it works from 12V to 18V, and indeed it works).