Quote:
Originally Posted by DIGITALBATH
Rev-
So I should do 120HZ on my sub(I guess we have the same receiver)- 
I trust you know your stuff. |
Honestly, LPF of LFE is going to make a very subtle difference that you probably won't hear with 95% of listening material. The reason is that mixers typically low-pass filter LFE content between 80-100Hz anyway. However, since the LFE channel itself is brick-wall filtered at 120Hz, setting LPF of LFE ensures that all of the LFE channel reaches your sub regardless of what point your other channels are crossed over to the sub. Note: LPF of LFE ONLY AFFECTS THE LFE CHANNEL. You can still set your channel crossovers higher than this without them being filtered (though you shouldn't).
That said, the harmonics are what give deep bass its perceived tone, and there are some movies that depend on those harmonics. A good example is LOTR: Fellowship, when Sauron dies at the beginning. There's a monstrous bass sweep that's partially in the speakers and primarily in the LFE channel, and you can definitely notice a difference between 80 and 120Hz LPF of LFE on that scene. With 80, it comes across more as a deep rumble, but if you pass the whole LFE channel, that rumble has a more defined tone to it.
Again, not a setting to get hung up on, because it won't make a huge difference. But for peace of mind that you're getting the whole LFE channel as the mixer intended, set LPF of LFE to 120Hz. Also, make sure you bypass any crossover/filter on your subwoofer itself so that you aren't cascading that filter with the filters your AVR is applying. If you can't bypass your sub's filter, turn its crossover knob to its highest setting. This also ensures that any crossover-induced delay doesn't throw off your distance/delay settings as determined by Audyssey.