I have had many enquiries, and thought that a good crossover - easy to build and set up - was a worthwhile project. This unit is all of the above, and if properly set up should satisfy the most critical listener. The behaviour is certain to be far more predictable and accurate than any passive crossover in a speaker system, and (with the additional amps) you get a bi-amplified system which will make you wonder how you ever put up with the system before.