: He identified the cheap, undersized electrolytic capacitors in the power stage. They were the reason for the muddy low end. He swapped them for high-grade Nichicon Gold
The A220 runs warm. If you are pushing the circuit "better" by increasing voltage or gain, ensure you add a larger aluminum heatsink to the TDA chip. creative a220 circuit diagram better
Most units feature two TEA2025 (or similar) amplifier ICs. : He identified the cheap