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I don't think you'll find a 4-way xlr y-adapter available off-the-shelf. You could combine three 2-way adapters to provide a 4-way split, and there are several of those available at B&H Photo Video. Here is one.
However, keep in mind that the preamp will see a load impedance equal to the power amp's input impedance divided by four. That may produce degraded deep bass response if the preamp has a coupling capacitor at its output (such as tube preamps typically have), and/or an uneven frequency response generally, if the preamp's output impedance is higher than a small fraction of that reduced load impedance.
Upon re-reading your question after submitting my previous response, I think you are saying that you only need a 2-way split, one 2-way split for each preamp output channel (left and right). In which case you can use any of the 2-way adapters that have been suggested, including the one I suggested which is available at B&H. And of course the load impedance seen by the preamp will be the power amp's input impedance divided by 2, not by 4.
Thanks for that tip Eldulcesol!
I'd previously posted this thread but still hadn't found a suitable XLR splitter. I experimented with my biamp setup using a set of one of the inexpensive splitter-cables you can buy on the Web, but they compromised the sound too much to keep in the system. And my reference interconnects weren't available in a custom Y-configuration.
But the Purists are just what I was looking for -- a splitter with no cable, just a one-piece, hard-wired Y-adapter. I don't think anybody else makes this kind of thing in XLR configuration from what I can tell. As you might expect they aren't cheap, but they're built to last, CNC-machined from solid blocks and fitted with Neutrik jacks. How many adapters have you ever seen that come with their own serial number and lifetime warranty card? (Look at it this way: They're still probably cheaper than getting a set of your preferred interconnects custom made in a Y-configuration.)
They fit perfectly and securely behind my Levinson 380S preamp, but did require a week of high-level signal break-in before achieving full transparency (interconnects hooked up between adapters and amps, power amps turned off, preamp volume turned all the way up, CDP set on repeat). However once I got through that period I don't think I could tell the difference in a blind bypass test, something I could never say about the inexpensive Y-cables. Highly recommended unique product, go to the Purist website and email Jim Aud for more info and a photo (these weren't listed or pictured on their website at the time I ordered).