I would like to use the Classé CA-5200 to bi-amp speakers, and who makes XLR biamping cables?

Alternatively, could you use Classé CA-5200 to bridge the channels?

I would greatly appreciate your help:o

First does your amp is rated to be bridged? check your manual.
Second you should start to read what is bi-amping there is no such thing as XLR bi-amping cable.
Third what speakers you want to bi-amp?
Forth what else you have for equipment to try to bi-amp IE electronic crossover?
Fifth just search here about bi-amp this is a very sensitive discussion with 3 different camps, some will say waste of time, the second will say only active bi-amp and the last will say passive bi-amp.

CA-5200 is very powerful, shouldn't need to bi-amp