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what is this distortion?

enter image description here

This is the circuit where it is derived

enter image description here

As you can see, it looks like there is a problem in the negative half cycle, its not really a straight clip. The waveform is taken at the 8 ohm resistor

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up vote 6 down vote accepted

A couple of observations:

(1) In your schematic, you show Q4 as an n-channel though the part number is for a p-channel.

(2) Also, in your schematic, Q4 appears to be "upside down", i.e., the drain is connected to the output rather than the source.

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thank you very much +1 – WantIt Dec 5 '12 at 0:42

It is 2nd harmonic distortion caused by asymmetry in the circuit. Its ability to sink current is less than its ability to source current.

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