Elizabeth has a valid point, although I might suggest that the upstream components don't necessarily suck, they just don't synergize with the Maggies. And certainly, like most speakers, they won't work in every room. Environments with RFI/EMI issues can require attention to shielding or RFI cancelation. It is my guess that people who enjoy well implemented Maggies have given considerable attention to power treatment, power cords, ICs, speaker cables, etc, in order to avoid polluting the sweet ribbon sound with electronic noise. I think Elizabeth would agree with that statement. The Maggie ribbons are just delicious in the right rig and room. In my opinion, the crossover design in the 3.7s makes the top end even better than the .6 series.
I suspect we have all heard numerous examples of Maggies done wrong. They are not the most forgiving speakers by far. Thus it is not hard to understand why Maggies have a reputation of having bright treble. Also, and again, this is just my opinion, but in the .6 series, they could exhibit some harshness in the treble at the crossover if driven hard. But I have heard this same thing in several non planar designs, and it is a transient, not a persistent, problem. I would never, ever, consider using a resistor with Maggies.
For the OP, rather than mess with trying to make jumpers to match the AQ4, I'd do some experimenting with other speaker cables. I had much better results with Signal Cable silver, and even better, Anti-Cable, than with AQ 4. The audio magic liquid airs are better than them all, but the point here is that you won't have to spend much or look hard to find something better than the AQ 4, in my opinion.