op-amp + op-amp buffer combinations

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Assuming the buffer is faster and that this will be used as the power amp for driving speakers,

if you have a op-amp with good THD+N performance and one with bad, in addition to a buffer that has good and one with bad, and you put the buffer inside the feedback loop of the op-amp, what will the THD+N of the combination be like for the different combinations:

good op-amp + good buffer
good op-amp + bad buffer
bad op-amp + good buffer
bad op-amp + bad buffer

Has anyone tried this before?
 
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