I need some semi-decent noise cancelling headphones , the ones i have right now dont cut it , i try and sort out my mic placement but my amp just overpowers the headphones so i can't hear the effect of me moving around the mics

I am willing to stretch my budget slightly so just suggest a decent pair for around that prcie
Mic placement is tricky with cans at the best of times.

Try recording a bit, then stopping, listening (with monitors), moving then repeat the process.
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JCM600 (Yes a 600..)