What mixes with Transparent Ultra Xl Speaker Cable

For the cost of reterminating an ultra cable I think you would be better off getting a set of used Supers and putting them on the bottom run. Some of the decision will be dependent upon your speakers. For some speakers (like mine-B&W 802N) bi-wiring was a more dramatic improvement than I thought it would be. For other speakers it doesn't seem to make that big of an impact. If this is your case then I would do what others have suggested... get the transparent jumpers or another high quality set.

Bwyoung, Transparent strongly recommends AGAINST using two separate cables for bi-wiring as you suggest. They say the networks can interact in unpredictable ways and affect the sound.

At one point I tried a bi-wire with MW Super on the top and MW on the bottom on some Maggie 3.5s; found that the sound was better with just the Super and jumpers.

Rex, I was unaware of Transparent's suggestion. Probably is best to do what they say. However, my conclusions were arrived at by trial and error with Super, Ultra, and Reference cable experimentations (all with the xl technology). I had no trouble with any of the combinations and now run reference on top and ultra on bottom. IN FACT, I owned and ran the reference for about a year with jumpers before adding the ultras to the bottom end. On the B&Ws it was a big improvement. One of the biggest I've experienced in my cabling experiments.