I have made multiple pair from various cables for my Alon speakers, which have tri-wire binding posts. I am currently using DH Labs with two single T-14's for mid and high frequencies, and one Q-10 for low frequencies to each speaker. I have some tri-wire Jon Risch CC89259 using the quad version for LF, and I have terminated Alon's Black Orpheus, Cardas bulk wire and others. You didn't mention the length you need, or your price range. I usually try to terminate the three cables together at the amp end with a single spade (there are only a few big enough for all that wire). If you are trying to go with a factory terminated cable, a good way to do it is to get a biwired set with a single spade at the amp end for MF and HF, then a separate single run with a banana at the amp end for the LF. If your amp has typical binding posts with a back hole made for bananas, you can clamp the spade for the bi-wire pair, then use the banana into the same binding post for the LF pair.
