On the net there is a very easy to do, reversible bass mod. You simply twist off the small mesh panel in the centre of the rear side of he headphones and underneath the exposed driver unit has a small piece of 'tape?' in the centre, peel this off to expose the 'bass port'. Simply replace the adhesive cover to reverse.
It Will be interesting to see the impact though I have listened to many reviews that state the Q701 as not being so much bass shy. Shows that it is all subjective really.
I'm actually excited to pit these against the X1. The X1 are very wide soundstage wise and very detailed with rich bass A bit more-so once burned in and stock cable replaced. Some have mentioned EQing the Q701 if extra bass is desired but I don't like to EQ and my amp has no tone controls (which I think is a good thing in general for my uses).
We will see!
T1 is USB only
You tried those HD600's out yet?
Just a heads up - the K612s are now available on MassDrop. No idea where they fit in in the audiophile headphone hierarchy, but thought some of you might be interested.