LFE and LPF for LFE?

[herbu]

Please tell me, (in relative layman's terms), if my understanding is correct.

1. Setting speakers to "Small" simply removes the LFE from going to that speaker, (though you can still fine tune by setting the crossover).

My AVR provides a "LPF for LFE" setting. The description says "Selects the crossover point for the LFE channel". The default setting, after Audessey, is 120Hz.

2. If I have my towers set to "Small" with an 80Hz crossover, but the LPF for LFE is set to 120Hz, am I losing the 80-120Hz range from my towers?

3. Even if I set the LPF for LFE to 80Hz to match my tower's crossover, would I still somewhat attenuate the 80-120Hz range from my towers?

4. Should I have some overlap in the crossovers, like LPF for LFE at 80Hz, and tower crossover at 70Hz?

Thanks!

 

[fuzz092888]

Please tell me, (in relative layman's terms), if my understanding is correct.

Alrighty

1. Setting speakers to "Small" simply removes the LFE from going to that speaker, (though you can still fine tune by setting the crossover).

No. Setting the speakers to "small" means that the crossover you select will effectively funnel sound below that point to the subs. The LFE channel is in movies and is a dedicated subwoofer channel that has nothing to do with the crossover you set.

My AVR provides a "LPF for LFE" setting. The description says "Selects the crossover point for the LFE channel". The default setting, after Audessey, is 120Hz.

Now the LPF for LFE is what affects your LFE output from your subwoofer. The lower you set the LPF for the LFE, the less information from the dedicated LFE channel you send to your subs above the point you set. Setting it as high as it will go means that you'll get all the information from this channel. Basically it's the .1 in 7.1 or 5.1.

2. If I have my towers set to "Small" with an 80Hz crossover, but the LPF for LFE is set to 120Hz, am I losing the 80-120Hz range from my towers?

Two totally different things. The 80hz crossover, in simple terms, means that anything below 80hz gets sent to the subs, and above it goes to the speakers. It's a little more complicated than that, but that's the gist of it. The LPF determines what the cutoff is for frequencies on the dedicated LFE channel go to the sub. Anything below that point you sent goes to the sub.

3. Even if I set the LPF for LFE to 80Hz to match my tower's crossover, would I still somewhat attenuate the 80-120Hz range from my towers?

The LPF doesn't affect your towers at all.

4. Should I have some overlap in the crossovers, like LPF for LFE at 80Hz, and tower crossover at 70Hz?

Thanks!

I would set the LPF as high as you can to get all the information from the channel.

 

[agarwalro]

Low Frequency Effects or LFE is the .1 in DD, DTS 5.1 or 7.1 tracks. It is not the same as lower octaves of 5 or 7 speaker channels. Therefore, it is incorrect to say that setting a speaker to Small removes the LFE from that channel. Conceptuality, on bass management, you are correct though. Any signal below crossover frequency for a speaker set to small is redirected to the sub.

1. Low Pass Filter or LPF of LFE works the LFE channel in reverse of crossover for speaker channels. Signal at frequencies higher than the LPF will be rolled off according to the filter slope. This helps reduce the load on your subwoofer. The other benefit can be for folks having problems with localizing the sub (meaning it is not seamlessly blending with the mains), it removed lower mid-bass from the LFE and may help with the situation. You can leave it at 120Hz if your sub is not giving you problems.

2, 3, 4. No, you are fine since LPF of LFE only affects the signal of .1 channel. For example, if you play a CD in 2.1 mode, this setting will not do anything since your original signal was 2.0. In your case, anything in speaker channels below 80Hz is redirected to sub and is not affected.

 

[herbu]

THANKS! You guys are the best!

 

[agarwalro]

Lolz! Que pasa, ese?

 

[afterlife2]

Shakespeare BASS workout!

 

[agarwalro]

Shakespeare BASS workout!

You're on!

Chemical assay.

 

[herbu]

Uhhh... what? Well, I did ask for "relative layman's terms". I get "3rd grade", "elementary" and "high school". Maybe partial credit?