Copying this post from my System #55 thread, since it may be helpful for others.
After YEARS of trying to optimally integrate one (or two) BF 210's with my Expressions, I've finally done it! I've always struggled with a major bass null (see below) at my MLP (main listening position). Now, after getting a new (incliner) sofa, I was able to place my two BF 210 subs behind it (as I had with my older setup), and try every conceivable permutation of downloaded sub filters, manual settings, and ARC Genesis correction. What I ultimately ended up with is this...
- Expression 13A’s: Bass -3 dB, Mid-bass +2 dB
- Single BF210 Sub: Located behind sofa/MLP with speaker level connection from my C-J amp, using Exp 13A -10 dB “crossover” filter, ARC optimized, volume control -3.5, and Phase 0°. Second BF210 is used only for home theater, via my Anthem MRX 740.
Green trace shows deep bass null I’ve always had with Expressions alone, even after Anthem Room Correction.
Yellow trace shows SINGLE sub with the custom “crossover filter” installed that’s designed to pair with Expressions Bass -10 dB.
Blue trace (isolated in 2nd pic) shows combined effect. Bottom pic is full range room measurement, showing no room modes, and relatively equal RT60 reverb across all frequencies.
Of note, when I actually dialed back the Expressions bass the full -10 dB, the summed effect (at MLP) rolled off too much below 30 dB. I then manually adjusted the Expressions bass to achieve the flattest overall response which still sounded good. Next step will be re-running ARC Genesis on my MRX 740 which adds the 2nd sub, ML Motif center, and in-ceiling surrounds. After that, I'll likely "tweak" the Expressions (and single sub) ARC Genesis correction curves manually (in Pro mode), to "tilt" the bass up a bit more.