beetlemania,
I may be coming into your 2.4 saga late, but when you mention sub reinforcement, why do you go Vandersteen? Rather than Thiel that have very well matched subs - particularly via speaker level PX crossovers? I have at least 6 different subs that I have tried to integrate via line level input. The current system with PX crossover is by far the most natural and completely integrated I’ve heard. Granted, there is zero support when the amp eventually gives out. Is that your motivation?
I may be coming into your 2.4 saga late, but when you mention sub reinforcement, why do you go Vandersteen? Rather than Thiel that have very well matched subs - particularly via speaker level PX crossovers? I have at least 6 different subs that I have tried to integrate via line level input. The current system with PX crossover is by far the most natural and completely integrated I’ve heard. Granted, there is zero support when the amp eventually gives out. Is that your motivation?