Without applying any EQ, the Q701 emphasizes the bass more than my 880's do. They both have great extension down to 18hz but the 701's are a little more pronounced in their delivery. I wouldn't say either are very bass heavy, just a light edge in love of bass with the 701's.
But who knows, the 701 is fully open and it sounds bassier than the semi open 880.
Both headphones need a little EQ to make the best use of their bass for me. I would mostly do this with games, and loud rock and electronic music. For classical music and jazz they sound great with zero EQ.
To give you an idea of where I'm coming from, the Sony MDR-V6 has the perfect amount of bass for me, and it runs about +10db from 100hz down to 30. In fact when I EQ the V6 I usually cut 120 by 3db and boost 16000 by 4 to clean up their midrange and add a little sparkle back in it's veiled highs.
Never any offence taken. Will be interesting to see your impression once you can side-by-side both. I like both - but personally feel that the quality of the bass is slightly better on the DT880s. Quantity is pretty even - although the mid-bass on the Q's can sometimes give the impression of 'more'. I guess it really will depend on what you're listening to.
Very, very strange.
I own a pair of Q701 and 600 Ohm DT880.
Whenever I change from one to the other I am always surprised by how much fuller the DT880s sound compared to the Q701. And how much lighter the Q701s sound.
Not to sound clique, but I really do think the difference between the two is night and day.
For a lot of music I find the DT880s to be overly full sounding.
Don't misunderstand me, I like both headphones and don't really prefer one over the other.
BTW, at a Head Fi meet I compared my Q's with another guys K70x............we both had an extremely hard time distinguishing between the two.