Originally Posted by luften
This shows that the THD+N is very low all the way until ~290mW where the clipping point seems to be.
Isn't the maximum continuious output current for the 634 250mA, and the short circuit current is 350mA.
The clipping is probably because you are driving it beyond the max cont current recomendations
, you've done pretty well to get it to run at that level
Just a thought
n00b