Balanced Y Adapters--Where to Find


The manual to the Levinson 380S pre specifically discusses the use of Balanced Y Adapters for passive biamplification. I have no clue who makes these or where to buy them. Can someone offer direction?
128x128dar
http://www.btx.com/Categories.aspx?Category=af56ddd7-402e-4251-8709-f1ecaa6c695a

or

http://www.audiogear.com/Audio-Adapters-Xlr.html
You may want something better since you're using Levinson, but I've good results from my Cobalt Cable Y's. Very cost effective. I bought a pair of these to use with my Norost SPM interconnects while I saved up for another interconnect pair for the second amp. Now I just use both amp out ports on my preamp which I think is better. I do think I get more background detail now, but I wouldn't say these Y's dimished the sound all that much. I'm sure the Purist would be even better.
To repeat what Nsgarch said - Cardas will make them for you.

I think there were some for sale here last year, but they were very short.
I bought a pair of Kimber KCAGs. Just remember to get the right male/female couplings on the right ends... (oops!).
I have a pair that were made by Tara Labs. Very good for use with Subs if you don't have 2 preamp outputs. It isn't uncommon, you just need to order it. The brand is more a concern about system synergy than anything else.