I think Vandersteen's approach calls for a gentle-slope crossover between mains and sub(s) - maybe even first order, I'm not sure. Nothing wrong with that, you just gotta have the right speakers for it. Well okay one possible drawback is that you have to keep the sub(s) near the main speakers, because they will still have audible (and localizable) output well into the upper bass region. Obviously not an issue if you plan to place the sub(s) near the mains anyway.
Duke
dealer/manufacturer.
Duke
dealer/manufacturer.