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LFE Mixing: Question and potential Enhancement
stewart_pk:
--- Quote from: Hendrik on June 09, 2022, 07:35:34 am ---The nature of the LFE channel means that it should generally always be boosted, so that one single channel can compete with potentially 5 or 7 other channel in volume.
--- End quote ---
I'm not sure this is quite right, I think the LFE needs to be boosted by 10dB bacause the standard says it should be attenuated by 10dB in VIDEO audio content to be 10 dB lower in output than the other channels.
From memory there is a standard (THX?) that says the LFE channel must be able to hit 115dB peaks while the other channels only need to be able to hit 105dB peaks, but that doesn't have any relation to mixing that I can see.
mattkhan:
As far as I am aware there is no standard in audio so you can only deal with it on a case by case basis
Reference level for cinema is 115dB from the lfe alone and 105dB for main channels calibrated at the listening position(s)
It is relevant to mix downs because you want to end up with content being at the right relative level in the final mix
AGAWA:
are we talking about .1 channel in surround recordings or LFE channel?
pls read the following:
"Tips on using the LFE Channel in 5.1
The LFE is a channel and is not the same as the subwoofer. It’s actually a 120Hz bandwidth limited channel (80Hz for DTS) that has an additional 10 dB of electrical headroom above the 5 main channels. It was created as part of the film version of Dolby Digital to enhance low frequency sound effects, such as large explosions and other LF content which exceeded the headroom of the main channel. Hence the name LFE: Low Frequency Effects and not low frequency bass channel. So, unless you are recording Tchaikovsky’s 1812 Overture with REAL cannons, it doesn’t need to be used in most music applications, but can be useful in film and multimedia applications.
An important note about the LFE channel: Never put anything critical to the mix exclusively in the LFE channel. This is because when a Dolby Digital decoder folds down a 5.1 source, it drops the LFE channel completely (poof!)."
DVD-A and DVD discs have .1 at -10dB and need boost while being played. Perhaps same with BR. SACD rarely use .1 channel.
mattkhan:
The reference level comment refers to films which are encoded in a standard way. Music has, to my knowledge, no such standard.
stewart_pk:
--- Quote from: AGAWA on June 10, 2022, 05:19:15 am ---are we talking about .1 channel in surround recordings or LFE channel?
pls read the following:
"Tips on using the LFE Channel in 5.1
The LFE is a channel and is not the same as the subwoofer. It’s actually a 120Hz bandwidth limited channel (80Hz for DTS) that has an additional 10 dB of electrical headroom above the 5 main channels. It was created as part of the film version of Dolby Digital to enhance low frequency sound effects, such as large explosions and other LF content which exceeded the headroom of the main channel. Hence the name LFE: Low Frequency Effects and not low frequency bass channel. So, unless you are recording Tchaikovsky’s 1812 Overture with REAL cannons, it doesn’t need to be used in most music applications, but can be useful in film and multimedia applications.
An important note about the LFE channel: Never put anything critical to the mix exclusively in the LFE channel. This is because when a Dolby Digital decoder folds down a 5.1 source, it drops the LFE channel completely (poof!)."
DVD-A and DVD discs have .1 at -10dB and need boost while being played. Perhaps same with BR. SACD rarely use .1 channel.
--- End quote ---
The LFE channel and .1 are the same thing.
I have numerous DVD-Audio discs and when I inspect the content in Audacity there is plenty of content on the LFE (.1) channel and not one of my DVD-Audio discs is the 1812 overture.
And two DVD-Audio discs I recently looked at had content peaking about 5dB below full scale.
I think this means that if they were boosted by 10dB by JRSS then they could end up being digitally clipped and hazardous and not to mention just too loud and hazardous.
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