I play both drums and bass guitar for many years. When I am on bass, my cabinet is 10x4 driven by a tube head.
When I am on my Roland TD10 drum set, my monitor is 300 watts. Yes, the Q701 does not have the strong bass punch/impact but in no way lacking.
I have found the bass/low frequencies on the Q701 to be very clean and precise. Bass lines sound wonderful and vivid. Q701 is definitely not a headphone for bass heads who enjoy heavy, pounding bass. Mid/treble are wonderful too. I recorded myself on violin and piano and listen to the tracks on the Q701. It was so scarily accurate and clear.
After several days of owning the Q701 and averaging 5 to 6 hours on it each day, I just love it. I am trying to audition the HD800 around my area just to compare and possibly get one.