LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings - Page 2 - Home Theater Forum and Systems - HomeTheaterShack.com

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post #11 of 26 Old 06-16-12, 10:29 AM
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

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It's not often that I get to chime in where such an illustrious sharpshooter misses a minor detail, but I thought I would give it a shot.
I shoot myself in the foot often because I read too fast.

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post #12 of 26 Old 08-03-12, 04:06 AM Thread Starter
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

Another question about this:

I bought a 'new' receiver, the Onkyo TX-SR876. This receiver has no SMALL/LARGE speaker option to choose from. I can however set the Xover frequency for each (FR, FL, CC, SR and SL) speaker individually. Does this mean if I set this Xover on 'FULL RANGE' (which is an option in the settings) the speakers are on 'large' and when I choose ANY Xover frequency (let s say 80) that this is the same as 'small'?

Also, there is a 'THX-subwoofer' option in the receiver which can be set on YES or NO. What does this do in both YES or NO?
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post #13 of 26 Old 08-03-12, 07:44 AM
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

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THX-UltraII wrote: View Post
Another question about this:

I bought a 'new' receiver, the Onkyo TX-SR876. This receiver has no SMALL/LARGE speaker option to choose from. I can however set the Xover frequency for each (FR, FL, CC, SR and SL) speaker individually. Does this mean if I set this Xover on 'FULL RANGE' (which is an option in the settings) the speakers are on 'large' and when I choose ANY Xover frequency (let s say 80) that this is the same as 'small'?

Also, there is a 'THX-subwoofer' option in the receiver which can be set on YES or NO. What does this do in both YES or NO?
Excellent AVR you just got. 80hz on the Crossover is considered the Small Setting on THX AVR's. Provided you are not using tiny Bose Cube's or the like, 80hz is a good setting for a speakers. What Speakers are you using? Also change the LPF of LFE from 80hz to 120hz. Newer Onkyo AVR's now use 120hz as the LPF of LFE.

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Speakers: Martin Logan Vantage (Mains), Martin Logan Stage (Center), Martin Logan Vista (Surrounds), Martin Logan Montages (Surrounds) Hsu Research VTF-15h MK2, Martin Logan Descent i (Subwoofer)
Amplification: Aragon 8008bb, Parasound HCA-3500, Parasound HCA-2205 AT, Parasound HCA-1000a
AVR/SSP: Denon AVR-4520CI
Electronics: OPPO BDP-93
Gaming Consoles: Sony PS4, Xbox 360 S (250 gb)
Display: Panasonic TC-P65ZT60, Sony KDL-55EX500, Sony KD-34XBR910
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post #14 of 26 Old 08-03-12, 07:55 AM Thread Starter
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

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80hz on the Crossover is considered the Small Setting on THX AVR's
thxz. Thats all I needed to know.

You also know what the THX UltraII subwoofer YES/NO settings does?
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post #15 of 26 Old 08-03-12, 08:00 AM
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

Sorry. Do not use it unless you have a THX Certified Subwoofer as it engages BGC (Boundary Gain Compensation) Also, THX Subwoofers must match the I/O (Input/Output) characteristics of the THX Controller (AVR/SSP) Long story short, set it to no unless using a THX Subwoofer.

HT
Speakers: Martin Logan Vantage (Mains), Martin Logan Stage (Center), Martin Logan Vista (Surrounds), Martin Logan Montages (Surrounds) Hsu Research VTF-15h MK2, Martin Logan Descent i (Subwoofer)
Amplification: Aragon 8008bb, Parasound HCA-3500, Parasound HCA-2205 AT, Parasound HCA-1000a
AVR/SSP: Denon AVR-4520CI
Electronics: OPPO BDP-93
Gaming Consoles: Sony PS4, Xbox 360 S (250 gb)
Display: Panasonic TC-P65ZT60, Sony KDL-55EX500, Sony KD-34XBR910
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post #16 of 26 Old 08-03-12, 08:16 AM Thread Starter
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

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Do not use it unless you have a THX Certified Subwoofer as it engages BGC (Boundary Gain Compensation) Also, THX Subwoofers must match the I/O (Input/Output) characteristics of the THX Controller (AVR/SSP) Long story short, set it to no unless using a THX Subwoofer.

I know the manual states to use it when you have a THX cert. subwoofer but what I want to know is WHAT is actually done by the AVR when selecting YES (or NO). Does something happens with the EQ, PHASE or TIME ALIGNMENT and if so, what happens to this? etc.

You can select THX Cert. Subwoofer YES and bound.gain comp. OFF so there must be a difference between NO and YES(with bgc off)
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post #17 of 26 Old 08-03-12, 08:23 AM
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

I covered that when I discussed THX Subwoofers matching the I/O characteristics of the THX Controller. THX Subwoofers. That is they have higher voltage levels to ensure the THX mandated 20db of additional Headroom for the Subwoofer over the THX Certified Loudspeakers. This is because THX Loudspeakers do not go much lower than 80hz by design as THX strongly recommends an 80hz XO for all channels and thus the Subwoofer is tasked with handling both the Bass for LFE and all speakers.

HT
Speakers: Martin Logan Vantage (Mains), Martin Logan Stage (Center), Martin Logan Vista (Surrounds), Martin Logan Montages (Surrounds) Hsu Research VTF-15h MK2, Martin Logan Descent i (Subwoofer)
Amplification: Aragon 8008bb, Parasound HCA-3500, Parasound HCA-2205 AT, Parasound HCA-1000a
AVR/SSP: Denon AVR-4520CI
Electronics: OPPO BDP-93
Gaming Consoles: Sony PS4, Xbox 360 S (250 gb)
Display: Panasonic TC-P65ZT60, Sony KDL-55EX500, Sony KD-34XBR910
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post #18 of 26 Old 08-03-12, 08:34 AM Thread Starter
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

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I covered that when I discussed THX Subwoofers matching the I/O characteristics of the THX Controller. THX Subwoofers. That is they have higher voltage levels to ensure the THX mandated 20db of additional Headroom for the Subwoofer over the THX Certified Loudspeakers. This is because THX Loudspeakers do not go much lower than 80hz by design as THX strongly recommends an 80hz XO for all channels and thus the Subwoofer is tasked with handling both the Bass for LFE and all speakers.
My subwoofer IS thx-ultraII certified indeed (Teufel M11000SW) but I looked at it s specs and the voltage seems about average (about the same as eg. the SVS PC13 Ultra). 80% of home cinema people have their [email protected] so they all have the same 'problem' that their subwoofer has to handle both the LFE signal and freq. from the satelites under 80Hz.

I still think there is something more about this setting. The best to find out is take measurements with THX subwoofer YES and NO and compare them. I ll do this this weekend.
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post #19 of 26 Old 08-17-12, 02:13 AM Thread Starter
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Re: LFE, LPF of LFE, crossover, Large/Small, main/main+LFE, confused about settings

Guys, I need to know something (I know what the LPF of LFE setting does):

What if my AVR (Denon 2808) DOES NOT have a LPF of LFE setting? What will happen with the LFE content from 80Hz and up? Will I lose it or does it mean that when a AVR does not have the LPF of LFE option it sends all the LFE signal by default to the subwoofer without a upper filter?
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post #20 of 26 Old 08-17-12, 08:09 AM
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Quote:
THX-UltraII wrote:
does it mean that when a AVR does not have the LPF of LFE option it sends all the LFE signal by default to the subwoofer without a upper filter?
Yes

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