More > JRiver Media Center 29 for Windows
LFE Mixing: Question and potential Enhancement
mattkhan:
--- Quote from: stewart_pk on June 11, 2022, 09:39:44 am ---Hang on I didn't get that from Hendrik at all!
Unless Hendrick will categorically state right here right now that JRSS won't effectively and I emphasise effectively boost the LFE by 10dB when downmixing to an output where there is no subwoofer, Hendrick?
--- End quote ---
It followed from my reading of previous test with synthetic signal however I realised the previous test was confusing so I tried again with 100Hz sine wave in L and 50Hz sine wave in LFE, with this it's clear that the LFE channel is boosted but the signal from the input L channel is also reduced by ~6.67dB. This is just for the 4.0 downmix btw.
--- Quote from: stewart_pk on June 11, 2022, 09:51:10 am ---Provide a checkbox option of "Don't apply 10dB boost to LFE" which if checked would apply to both non-dowmixed and downmixed output.
--- End quote ---
re the bit I put in bold... MC does not apply this boost, you can test this yourself and Hendrik said the same in https://yabb.jriver.com/interact/index.php/topic,133272.msg923355.html#msg923355
stewart_pk:
--- Quote from: mattkhan on June 11, 2022, 11:27:13 am ---It followed from my reading of previous test with synthetic signal however I realised the previous test was confusing so I tried again with 100Hz sine wave in L and 50Hz sine wave in LFE, with this it's clear that the LFE channel is boosted but the signal from the input L channel is also reduced by ~6.67dB. This is just for the 4.0 downmix btw.
re the bit I put in bold... MC does not apply this boost, you can test this yourself and Hendrik said the same in https://yabb.jriver.com/interact/index.php/topic,133272.msg923355.html#msg923355
--- End quote ---
Thanks for performing the test especially as Hendrik didn't answer.
I know that JRSS does not boost the LFE by 10dB for actual .1 channel output although I can see what I wrote might be confusing.
stewart_pk:
--- Quote from: Hendrik on June 11, 2022, 10:21:46 am ---I already commented on that above - theoretical considerations are not enough reason to offer an option we don't have any confirmed data if its needed or helpful.
Please share any data or files where this is a real problem so we can look into it.
--- End quote ---
If I sent you a multi-channel 5.1 FLAC or MP3 that has the LFE at a level within -10dB of full scale e.g. -4dB or -5dB would that suffice?
stewart_pk:
Provide a dropdown relative to downmixing with options of "Mix LFE to all channels" and "Mix LFE to the main L and R channels".
Hendrik, if you are not interested in this enhancement than can you please say NO?
If so, I will simply leave it at that.
stewart_pk:
Here I have a sample within Audacity.
Note in the first screen-shot the LFE channel (4) appears to peak at about the same level as the centre channel (3) which at this stage this is fine.
In the second screen shot I am applying a 10dB boost to the LFE channel.
The third screen-shot shows the LFE channel after it has been boosted by 10dB and it's become very loud (and clipped).
Now JRiver may have clip protection and also lower channels other than the LFE (L, R, C, LS, RS) to appropriate levels but the LFE will be too loud as far as I can see.
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