I intend using a seas 5.5" paper/reed driver, the ER15RLY, with a fountek neo x 2 ribbon tweeter in a small ported bookshelf type speaker. I can design the and build the speaker, but designing the crossover is something I really don't want to tackle. Are there any suggestions for a person or firm that can be recommended to do this work, and at reasonable cost. I don't expect anyone to work for nothing, but similarly I don't want to pay a Kings ransom either. Madisound advertises such a service on their website at most reasonable cost but I believe their designer has since retired.