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The M9 doesn't seem to drive my Sony WH Xm1000 very well. I have to put the volume up to almost 97 for any reasonable comfortable sound. Do you think I need an amp for this. If so, what would you recommend.The headphones are in bluetooth mode. Thank you
That's not the M9 doing anything son. That's the headphone itself amplifying itself.
Try direct 3.5mm from M9 to WH if you want power.