Originally Posted by butie120
So can someone help explain this to me. I'm trying to reduce localization when placing the sub behind me. I might try lowering the crossover to 60hz, but I've also been reading more about reducing the LFE channel to 80hz. Do these differ in the way they reduce localization?
I do think it's possible that reducing the LPF of LFE to 80Hz would reduce localization, and I wouldn't be afraid to try it. It was Mark Seaton and Roger Dressler (formerly with Dolby Labs, and one of the creators of Dolby Pro Logic and PLII) who I first heard suggest reducing the LPF to 80Hz. Their analysis indicated that very little content above 80Hz is meaningful. Apparently, a lot of it is just random noise.
And, that is consistent with the original intent of the Low-Frequency Effects channel. It was originally conceived as a way to emphasize low-bass effects more than mid-bass effects. And, it was given an extra 10db to facilitate that. Since that original analysis from Mark and Roger, others such as Marc Fishman, who posts on the forum as FilmMixer, have confirmed the lack of meaningful content above 80Hz in their movies. And, the LPF is just a filter, so it gradually rolls-off content above 80Hz. It doesn't eliminate it.
I have experimented quite a bit with settings ranging from 80Hz up to 120Hz. In my room and with my system, the differences are fairly subtle, but they are distinguishable. 120Hz gives me more bass, but it sounds a little muddier with higher volumes and bass boosts. An 80Hz setting is perceptibly clearer sounding to me. YMMV!
But, if I were experiencing localization from a nearfield sub, I would definitely try the lower LPF setting.