Sure, this is often the case when you combine mains with good extension and subs. That’s why we separate their operating frequency ranges....it looks like I have some significant freq cancellation between 70hz - 90hz when the sub and mains are run together.
At the risk of sounding “snippy” - perhaps you’re over-analyzing things? Setting up crossovers between subs and mains is usually considerably easier than making a movie. Typically you can just set it somewhere between 80-100 Hz and you’re good to go. Only in unusual circumstances are staggered crossover points needed.The NHT vt-1.2a mains each have a side firing 8" woofer. So to resolve this, my immediate thought is to adjust the crossover in the UMC-200 and set the mains somewhere between 100-120 with a 24db slope, and set the sub somewhere between 80-100 with a 24db slope. Since I'm performing the EQ'ing and crossover with the UMC-200, and measuring by connecting directly to the amps, I'm not sure if there's a way for me to measure how effective the solution would be. Maybe I can use the multichannel input, although I'll have to read up to see if that input will bypass the internal processing.
Any thoughts on this?