This is how it's looking so far. Still have all the outputs to wire in and the all the module boards to put together. This is the 4 way cross over and I just added a summed sub output tonight, both single ended and balanced. All Burr Brown OpAmps too.

This is the sub crossover and equalization unit called the Bassis. Its a duel channel unit so I just use one side.

I listened to the Marchand Tube crossover and it sounds very nice. The attenuator components are also very nice in that model. You should get going on the design you have been working on. I'm sure your busy or you would be on it. Always yet another project eh?

Bill