They may not ultimately be the speaker for you but it is too early too tell. my D7 Spendors took at least 200 solid hours for the bass to become pronounced and the treble to smooth out.
the bass has to bloom as one way to balance the mids and highs and you do this by flexing and working the woofers with bass heavy material at higher volume for 48 hours just like breaking in a subwoofer- see RELs subwoofer break in process.
thom yorke and atoms for peace is an excellent break in cd.
in the mean time there are things you can do to help-
make sure they have plenty of space around them including away from any screens or big surfaces that can reflect midrange outward.
try setting the toe angle so they aim at a spot a few feet in front of you, the off axis response tapers off the upper mids and above.
try tube rolling to offset the highs, the stock mac jjs can have a bright top.
definitely avoid or replace any hybrid silver copper or silver speaker and interconnects. go for high quality copper, ohno or occ, the kimber 8pr speaker cables are excellent for warming the midrange and smoothing highs.
big picture i am sorry that I eventually sold the D7s. they did some things better than most speakers including incredibly deep bass from the transmission line port, excellent detail and imaging and through the ceiling micro dynamics and speed that gives music a realistic sense. also very efficient and easy to play loudly. the things they do well are difficult to find in other speakers.
