SM58 strange behaviour...

[gilwe]

This is strange. When I mic my start on the Twin Reverb amp, or my Farfisa organ, the sound is just great,

but when I mic my classical guitar it gets distorted !!

No matter how far or close I put the mic from the guitar.

Why is that ?

 

[cominginsecond]

Is there a buzz in your classical guitar? I had the same problem and it took me a few days to realize that my classical guitar was buzzy.