In reply to:
Adding a sub won't really do the job as it would be hard to match the speed of the Maggies with a box speaker
So, is it your goal to slow every thing down then? j/k
I think this may have been true when subwoofers were in their infancy when all but the most expensive subs sounded bloated and "slow". Subs have come a long way since then.
These days, there are so many very good "fast" and clean and relatively inexpensive subs around that it isn't all that difficult to match a sub with Maggies or Logans or Quads etc.
I have the 1.6QRs mated with a HSU VTF-3. With a little judicious speaker placement combined with a little room treatment here and there, I've got a pretty seamless blend between the two and virtually no localization of the sub as a consequence of mixing planars and box designs.
Have you been to your friendly neighborhood Maggie dealer lately? You might be surprised at what you hear in the way of bass from modern Maggies.