Audiolense doesn't address how the playback format is played back. It is
assumed that the 10 dB reduction is handled by the player or some other
application. If this is not the case, you can use the input-output routing
to specify a minus 10dB figure. The magic number is 0.33. Divide it by the
number of speakers who receives the LFE channel. I've attached a screenshot
where the front left is used to receive and attenuate the LFE by 10dB.
Kind regards,
Bernt
Brad
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You can disregard my previous response since I was suggesting attenuation of
the LFE instead of amplification.
All speakers are 100% level matched in Audiolense. So in order to get the
LFE played back at the correct level, 10dB of amplification need to be added
somewhere in the digital domain.
As long as the sub has the 10dB headroom in its analog gain + sensitivity,
this will give a combined filter + signal with amplification that has the
required headroom to handle the load.
Are you using JRiver? I have sent a question about how this is handled by
JRiver with different settings, and I will come back with a solution for
JRiver when I have it.
If you're using a different player and Sourceforge Convolver, and know that
the LFE is handed over to the Convolver with the -10dB level attenuation
intact, you could use the 0.316 multiplier for all routing except for the
LFE where you need to use 1.0. Then you can normalize by amplifying
everything by 10dB in the Convolver GUI. Sourceforge Convolver doesn't
accept upscaling in the config file, only downscaling. So that prevents us
from upscaling the LFE with 10dB there and we have to downscale everything
else instead.
It has been the philosophy that the player should be set up to align the LFE
channel with the other channels, since the player holds the information
about the playback format while the convolver doesn't. But I'm open to
suggestions here. It is not a big programming task to change how Audolense
handles the LFE, but it is important that it is handled in a way that avoids
unanticipated amplification of 10dB somewhere - and keep the confusion level
as low as possible.
Kind regards,
Bernt
-----Original Message-----
From: audio...@googlegroups.com [mailto:audio...@googlegroups.com] On
Behalf Of Brad
Sent: Wednesday, February 22, 2012 9:35 PM
To: Audiolense User Forum
--
I'm having a discussion with JRiver now. It is not yet clear to me how the
LFE is managed in JRiver on different playback settings. When that
discussion has been finalized I will suggest a solution here on the forum
and ask for comments before it is implemented. The end solution is not
unlikely to be something along the lines that you have suggested, but there
may be other ways of solving this as well.
Kind regards,
Bernt
-----Original Message-----
From: audio...@googlegroups.com [mailto:audio...@googlegroups.com] On
Behalf Of Brad
Sent: Thursday, February 23, 2012 1:09 PM
To: Audiolense User Forum
Subject: [audiolense] Re: Bass Management Questions
Brad
--
In DSP Studio in JRiver:
*Move the "Room Correction" module to the top.
*Enable
*Amplify sub with 10dB.
-as shown in the enclosed picture.
This will attenuate the all other input format channels except the LFE with
10dB, while the LFE will remain at 0dB. This means those of you who have
dedicated subwoofers with 10dB extra gain are wasting 10dB of gain. For
those of you who feeds the LFE to mains speakers this is a perfect
solution, where you have as much gain as you can have without risking
audible clipping.
In Audiolense: Go with the normal input output matrixes without adding or
subtracting 10dB anywhere.
The automatic "Normalize filter volume" in the Convolver sometimes plays a
lot louder than the already calibrated filters from Audiolense. In the
normal case this means a risk of running into audible clipping so I advise
against using it for music playback. But if you run low on gain while
watching movie you can try this and see if you get a few dB back without any
signs of audible clipping. I've asked if Matt will consider implementing a
manual gain function in the Convolver. Such a function will enable each user
to find and use what works best in his or her setup. If they chose not to do
it I will consider amplifying the subwoofer filters (which are only used for
LFE anyway) with 10dB in Audiolense.
Anyway, those guys have done a great job with the convolver and I think we
have a pretty decent solution here already.
Kind regards,
Bernt
-----Original Message-----
From: audio...@googlegroups.com [mailto:audio...@googlegroups.com] On
Behalf Of Brad
Sent: Thursday, February 23, 2012 8:59 PM
To: Audiolense User Forum
Subject: [audiolense] Re: Bass Management Questions
--
I will find a fix for the gain issue too. But I chose to post this solution
now because it will work already.
Those curves you posted a link to should be taken with a large grain of
salt, btw. They peak @ 0Hz.....
Kind regards,
Bernt
-----Original Message-----
From: audio...@googlegroups.com [mailto:audio...@googlegroups.com] On
Behalf Of Brad
Sent: Friday, February 24, 2012 10:46 PM
To: Audiolense User Forum
Subject: [audiolense] Re: Bass Management Questions
What if I don't want to throw away that ten dB of gain and worsen my signal
to noise ratio by 10 dB? The 10 dB LFE offset can not be achieved optimally
in the digital channel levels. This is a lame recommendation in my opinion,
sorry.
Any typical user who is playing JRiver MC out through a department store
surround sound receiver does not have to make this compromise.
You are telling those of us working at the "high end" of audio to make a
10dB compromise? Some you your users probably can hear a difference in
speaker wire and interconnects, let alone this suggestion.
The LFE gain offset really helps audio systems cover the natural power
spectrum of music. Look at these power spectral density curves:
http://cnx.org/content/m11674/latest/
I believe those are acoustic levels. Since low frequency drivers are less
efficient than mids and highs, the electrical low frequency demand is even
greater. I'm sure most Audiolense users have separately amplified high power
subwoofers.
Here is a work around solution if there are no other options: In my case, I
could put a -10 dB pad in the LFE channel between my DAC and LFE channel
power amps (I would need three of them as I have three subwoofer channels):
http://www.sweetwater.com/store/detail/PADBLOX10
Then I'll use Audiolense normally. I'll then take out the pad for normal
program playback and attenuate the rerouted bass filters 10 dB
(.316) in the configuration files.
--
Bernt
-----Original Message-----
From: audio...@googlegroups.com [mailto:audio...@googlegroups.com] On
Behalf Of Brad
Sent: Tuesday, April 03, 2012 7:53 PM
To: Audiolense User Forum
Subject: [audiolense] Re: Bass Management Questions
Hi Bernt,
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Audiolense User Forum.