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TOPIC: Sending LFE to L/C/R when not using subs.

Sending LFE to L/C/R when not using subs. 2 years 9 months ago #27215

raynist Offline Junior Boarder Posts: 25 Karma: 0	john.reekie wrote: Hm... .could you save that configuration to a file and post it? (renamed as .txt) here it is! Attachments: ...CR3.txt (62KB)
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Sending LFE to L/C/R when not using subs. 2 years 9 months ago #27228

john.reekie
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Hi, a few quick thoughts (without reference to your earlier post):

You have LCR turned on in LFE Mgt, should be off.
The LFE channel will require 10 dB gain (*).
You are using 12dB/octave filters, which will cancel at the crossover frequency (unless you invert the output channels). I suggest 24dB/octave Butterworth.
You "probably" don't need a lowpass filter on the LFE channel.

(*) This is assuming the LFE channel in your source media is recorded 10 dB lower then the other channels, as it is for movies. Obviously there is potential for clipping here so I would suggest as a starting point set AVR volume to full and use nanoAVR volume.

I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?

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Sending LFE to L/C/R when not using subs. 2 years 9 months ago #27229

raynist
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john.reekie wrote:

Hi, a few quick thoughts (without reference to your earlier post):

You have LCR turned on in LFE Mgt, should be off.
The LFE channel will require 10 dB gain (*).
You are using 12dB/octave filters, which will cancel at the crossover frequency (unless you invert the output channels). I suggest 24dB/octave Butterworth.
You "probably" don't need a lowpass filter on the LFE channel.

(*) This is assuming the LFE channel in your source media is recorded 10 dB lower then the other channels, as it is for movies. Obviously there is potential for clipping here so I would suggest as a starting point set AVR volume to full and use nanoAVR volume.

Thanks for reviewing the file!

I will try the adjustments mentioned below tomorrow evening and report back.

On what tab/channel should I have the 10db gain?

Thanks again!

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Sending LFE to L/C/R when not using subs. 2 years 9 months ago #27230

john.reekie
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Posts: 3351
Thank you received: 1425
Karma: 133

raynist wrote:

On what tab/channel should I have the 10db gain?

LFE Mgt tab, LFE channel.

However, now that I think about it a bit more, you probably won't need a full 10 dB as you are feeding it to three speakers. But it all depends on how the three speakers interact at low frequencies. I guess I'd start with say 5 dB and measure it. The final results should be that the LFE channel is acoustically about 10 dB higher than say L.

Meaning, you should end up with the same type of response as with bass management e.g. from the app note

I am not miniDSP support.

"You must ask the right questions." - Dr. Alfred Lanning's hologram.
-> Have you read the User Manual??
-> Have you drawn and posted a diagram?
-> Have you posted a screenshot?
-> Have you posted your config file?

Last Edit: 2 years 9 months ago by john.reekie. Reason: tab not tag

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The following user(s) said Thank You: devteam

Sending LFE to L/C/R when not using subs. 2 years 9 months ago #27241

raynist
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Junior Boarder
Posts: 25
Karma: 0

john.reekie wrote:

Hi, a few quick thoughts (without reference to your earlier post):

You have LCR turned on in LFE Mgt, should be off.
The LFE channel will require 10 dB gain (*).
You are using 12dB/octave filters, which will cancel at the crossover frequency (unless you invert the output channels). I suggest 24dB/octave Butterworth.
You "probably" don't need a lowpass filter on the LFE channel.

(*) This is assuming the LFE channel in your source media is recorded 10 dB lower then the other channels, as it is for movies. Obviously there is potential for clipping here so I would suggest as a starting point set AVR volume to full and use nanoAVR volume.

I made the adjustments you mentioned and it is sounding really good now!

I am getting some clipping as I increase the LFE channel up to +10db, but I lowered all the channel volume on the output tab so that it no longer clips. I have to turn my avr up a bit more but I don't have a problem with that.

You mentioned controlling the volume in the nano. I think I may have disabled the NanoAVR volume me can't figure how to get it back. I looked in the manual but don't see it

Thanks again for all of your help. We have it sounding sooooo much better than earlier in the week.

I will try to make time for full measurements tomorrow when the wife and daughter are out shopping and will post here

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Sending LFE to L/C/R when not using subs. 2 years 9 months ago #27242

john.reekie Offline Platinum Boarder Posts: 3351 Thank you received: 1425 Karma: 133	Cool For nanoAVR volume you can use the IR Learning screen, or the iOS/Android app (linked from nanoAVR page).
	I am not* miniDSP support.* "You must ask the right questions." - Dr. Alfred Lanning's hologram. -> Have you read the User Manual?? -> Have you drawn and posted a diagram? -> Have you posted a screenshot? -> Have you posted your config file? The administrator has disabled public write access. The following user(s) said Thank You: devteam

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Sending LFE to L/C/R when not using subs.