How to reduce distortion in amp with Tda2030 IC when using at high volume
Benguru is right, few more comments: Using a single 9V supply is no good idea, better 12 or +-9V (no small 9V block of course). Such PA can clip in the voltage domain, then increasing the supply voltage is best. If clipping is in current domain, then maybe the impedance of LS is too small (like 2 ohms, which is in contradiction to the datasheet). For checking this an oscilloscope is best. Also check how large your supply really is directly at the IC, and under that full load conditions. To avoid oscillations, put the series RC directly at the IC output, not behind the elko C3.