Originally Posted by PeterAlt
I have a Denon TX-SR508 and I've spent too much time on my own trying to make sense of the crossover frequency settings. After hours of experimentation, I'm somewhat confused. Here's what I thought I knew about bass management and surround sound:
A 5.1/6.1/7.1 sound track includes a discrete channel for LFE effects. The other channels may have encoded the full range of audible frequencies. The subwoofer outputs the LFE channel plus the lower frequencies of the full range channels. The crossover frequency is the where the AVR sends the lower frequencies of the regular channels to the subwoofer. All frequencies under 120 kHz are non-directional by human perception.
The consensus is closer to 80Hz but, otherwise, you are doing fine.
Should I set the crossover frequency to the lowest frequency the speakers are designed to handle, or the lowest optimum frequencies of the speakers? If the speakers are full range, what should the crossover frequency be?
Again, the consensus is that all speakers should be set to SMALL in order to take advantage of the bass performance of the sub. The crossover should be chosen to be at the -3dB point or above. Too many variables to generalize.
What are "main" speakers? The front l/r, all satellite speakers, or just the full range speakers?
Every speaker except the sub is a main speaker.
Is there an advantage to output LFE to both the subwoofer and main speakers?
IMHO, no but some like the more emphatic bass.
My AVR allows each channel to have its own crossover frequency. With full-range speakers, it has a subwoofer setting for LFE or LFE + main speakers. What should I set this to?
Does "LFE + main" mean that the LFE channel will be directed to both the subwoofer and the main speakers?
No, it means that the main channel bass is directed to both the main and the sub.
Now what has me really confused is that, when you set it to have individual crossover frequencies for each channel, it also allows you to set the crossover frequency for the LFE channel (in addition to individual settings for the front, center, and surround channels). If the crossover frequency directs low frequencies to the subwoofer and the LFE channel by default is the subwoofer, how can it have a crossover frequency?
The so-called LFE crossover (really a low-pass filter) affects only the LFE component of the sub output and not the redirected main channel bass.
Where would it be crossed-over to?
Generally, leave it at 120Hz.
The mains? The lowest this could be set to is 80 kHz and this setting disappears if the subwoofer is set to LFE only.
That is strange.