Transsexual, Androgynous and Hybrid interconnects

Is it a better idea to have a custom interconnect cable terminated with a male XLR on one end and male RCA on the other? I'd rather not use an adapter if I didn't have to.

My amp only has XLR connections and the crossover that came with my newly purchased speakers only has RCA's. Is the custom cable I am proposing a good idea or is an adapter the best way to go?

Any advantages of one idea over the other?

thanks.....mitch