AVR Subwoofer LPF Setting

[slyboogy]

Hi

I currently have my AVR set up to crossover all speakers to the subwoofer at 80hz. I then have my sub crossover dial the highest it will go and the level dial set as needed

The question I have is my receiver has a setting for Subwoofer LPF (Low Pass Filter) _ off or On , on description says it activates the LPF with a cut. Off of 120hz

Should this setting be on or off??

 

[lovinthehd]

Your receiver has a setting of LPF of LFE, so it only affects content with .1 ch content. Normal LFE content is a limit of 120hz (altho its possible to have more, its generally not done is my understanding) so that's a normal setting, some avrs have various lower levels you can adjust it to, like mine, but I doubt it will make much of an audible difference in any case.

 

[slyboogy]

Your receiver has a setting of LPF of LFE, so it only affects content with .1 ch content. Normal LFE content is a limit of 120hz (altho its possible to have more, its generally not done is my understanding) so that's a normal setting, some avrs have various lower levels you can adjust it to, like mine, but I doubt it will make much of an audible difference in any case.

makes total sense - thanks for your help on this!

 

[BlwnAway]

Hi

I currently have my AVR set up to crossover all speakers to the subwoofer at 80hz. I then have my sub crossover dial the highest it will go and the level dial set as needed

The question I have is my receiver has a setting for Subwoofer LPF (Low Pass Filter) _ off or On , on description says it activates the LPF with a cut. Off of 120hz

Should this setting be on or off??

Just help with your understanding of this I'll add a little:
Low Pass Filter (not technically a crossover)
In essence means Low "CAN" Pass or anything above the set point will not pass through. And under almost all circumstances you really don't want your Sub to be playing high frequencies over 200hz, but anything over 120 to 160hz would only really be for a small Sub driver (8-10") so to cover most cases AVR and Sub mfg's usually just offer 120hz as the limit.
While you can set it lower, in most cases you wouldn't want to since you won't get proper integration with your crossed over speakers and lose some of the higher frequency tactile punch from the LFE channel.

 

[lovinthehd]

Just help with your understanding of this I'll add a little:
Low Pass Filter (not technically a crossover)
In essence means Low "CAN" Pass or anything above the set point will not pass through. And under almost all circumstances you really don't want your Sub to be playing high frequencies over 200hz, but anything over 120 to 160hz would only really be for a small Sub driver (8-10") so to cover most cases AVR and Sub mfg's usually just offer 120hz as the limit.
While you can set it lower, in most cases you wouldn't want to since you won't get proper integration with your crossed over speakers and lose some of the higher frequency tactile punch from the LFE channel.

Check out the full range frequency response graph for this 18"

How does setting an LPF of LFE affect integration with the speakers?

 

[BlwnAway]

That specific driver is not the norm, there are always exceptions to be considered, it's high frequency response is better than most large drivers, this is why the comment was made that it actually would work well as the bass driver in a 3 way tower speaker.
It would take a big amp and the proper cabinet to get that response built inside of an enclosure, but as the graphs show, it would be possible under the right conditions.
There are always those exceptions to the general rule, IMO I'll bet you could get the same from a 2 way and Sub combo for much less cost, it seems like a specialty item for a select market.
Look at the single driver full range solutions, can you do it.... yes, do you want to....that's up to you. Personally it seems like a lot of effort to do what we already can do, pretty well, with current form factors.

 

[lovinthehd]

That specific driver is not the norm, there are always exceptions to be considered, it's high frequency response is better than most large drivers, this is why the comment was made that it actually would work well as the bass driver in a 3 way tower speaker.
It would take a big amp and the proper cabinet to get that response built inside of an enclosure, but as the graphs show, it would be possible under the right conditions.
There are always those exceptions to the general rule, IMO I'll bet you could get the same from a 2 way and Sub combo for much less cost, it seems like a specialty item for a select market.
Look at the single driver full range solutions, can you do it.... yes, do you want to....that's up to you. Personally it seems like a lot of effort to do what we already can do, pretty well, with current form factors.

It's a subwoofer that I use several of. No, not all subs have such a response. It's just not limited by the diameter of the driver...

 

[BlwnAway]

It's a subwoofer that I use several of. No, not all subs have such a response. It's just not limited by the diameter of the driver...

Not to hijack the thread, but what size amp is in those? That's a massive driver to move that quick to get that kind of response and accuracy at those higher frequencies.
Those have to have a great tactile kick besides the solid Lows.

 

[lovinthehd]

Not to hijack the thread, but what size amp is in those? That's a massive driver to move that quick to get that kind of response and accuracy at those higher frequencies.
Those have to have a great tactile kick besides the solid Lows.

The tests Josh does is with a very high power amp, more powerful than most will use. Personally I have wired the driver for 4ohm and either bridge an amp for 1550w or run them each on a single channel at 525w, using Crown XLS1500s, using their spec. They're not "in" them, though....

You might want to read these, too

Yes, one snugged up behind the couch is very nice for tactile. Currently using three of them with my old Epik Empire, but will be replacing the Epik with a dual-opposed build with the same SI HT18D2 drivers....