Well I received my DH Lab Q 10 jumpers to match my speaker cables and I am a happy camper (at least for now).
I was unhappy with the provided jumper, the Cardas jumper was a bit better but the tweeters did not have the same sound signature as the other components, and the provided resistor just truncated the highs.
The DH Lab jumpers cost $32.50 (for two) are about six inches long and do the job marvelously. There is no longer a discontinuity between the tweeter and the rest of the speaker. The highs have the same sound signature as the mid range and low end. Furthermore, all of the high harshness is gone (I will find out more as I listen to more music.). I want to thank the folks at DH Lab for their help. They are great folks with great products.
Many of us (including myself) disparage the Magnepan folks for providing those cheap jumpers. I think we need to stop this. I now look at the stock jumpers as a temporary configuration until we users provide jumpers that match our speaker cables.
I wish Magnepan would adopt this point of view and include it in their literature.