@livinon2wheels it whose and is implemented as two shelving filters low and high self Q 0.71 (Butterwort) first and more important is bass one at 105 Hz and that is a knew frequency. High self one is much more mild and isn't needed until you get to relatively low listening levels. What most folks don't get is that you can't make woofer stop and get back to it's base line fast enough when the boost under the knee is big. This produces nus effect of boost up to 1 KHz and leak of the bass in mids. You only can fix this addressing it physically making crossover point above the knee (120 Hz) so that it stays on sub's but then you need 2.2 setup as from 80~90 Hz it becomes directional. Variation of even 2 dB in low bass makes a big difference in how we perceive it. As long as you have SPL meter and single free PEQ (supporting low self filter) you can play with it and even make cuple pressets you can quickly change to the mood and usual for you listening SPL. Bass slope goes inverted above calibration point (88 dB SPL stereo white noise).
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I typically when I can listen to music or movies at a high enough level I don't need much correction but there are times when I can't and its those times I would appreciate having an easily accessible preset of some kind that I could use to modify the curve. Thanks for your explanation. I'll play with creating another preset for lower level listening and see how I like it.
