Re: [slim] Quality loss with ReplayGain?

2010-08-06 Thread Teus de Jong

pski;567038 Wrote: 
 So if this is No Volume Adjustment, what is the effect on playback
 volume?
 
Like the options says: there is no effect on the volume. In other
words: the cd is played as loud as it is recorded.
 
 Some CD's (Live at SXSW by Thomas Dolby and the Jazz Mafia Horns) are
 really loud and drive the amp to protect.
 
Maybe you should use RG then (if the album tracks have the RG tags
filled). A lot of modern cd'd have a RG value of -9dB; I have even seen
one with -13 dB. Compared with cd's from some decades ago, these cd's
will play 3-5 times louder. When these albums are played amidst others
and RG is not used, you get the effect you mention.


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Re: [slim] Quality loss with ReplayGain?

2010-08-05 Thread pski

So if this is No Volume Adjustment, what is the effect on playback
volume?

I can play most m4a's made by iTunes (from CD) at 100% when my receiver
is connected directly to the amp.

Some CD's (Live at SXSW by Thomas Dolby and the Jazz Mafia Horns) are
really loud and drive the amp to protect.

p


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Re: [slim] Quality loss with ReplayGain?

2010-08-03 Thread cliveb

Teus de Jong;566160 Wrote: 
 Clive, I hope I understand your reasoning. As I understand it, this
 means that with an album peak level of 0.9, the positive gain will be
 at most 0.92, even if the RG of the album is +3.
 [snip]
 Album Volume Adjustment: 3.24 dB (1.62 dB to prevent clipping)
 So, if I set the digital volume to 90 there would be room to apply the
 +3.24 dB, but even then only +1.62 is applied. Is this sound reasoning?
In the Squeezebox world, yes. That's just the way RG is implemented on
Squeezeboxes.

Other players might be intelligent enough to factor in the additional
headroom available when digital attenuation is in force, although I
don't know of any that do.

I get the impression that Squeezebox Server is in possession of all the
necessary data to do this (file peak level, RG gain, SB volume setting),
so I'd have thought it ought to be fairly easy to implement. But
Logitech's engineers might have reasons for not doing so (other than
the obvious one that they can't be bothered). The peculiar behaviour of
the volume control I mentioned in my previous post is one possible
reason; perhaps there are others too subtle for my feeble brain to
think of.


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Re: [slim] Quality loss with ReplayGain?

2010-08-02 Thread Teus de Jong

garym;566005 Wrote: 
 It does seem that most (95% I'd say) of my replaygain adjustments are
 NEGATIVE. So 100% volume wouldn't be an issue for these.

Agreed, almost all pop/rock albums of the last decade have negative
replay gain, so a 100% volume setting won't make any difference. But in
classical music the loudness war did not have so much impact and a lot
of albums have a slight positive replay gain. Some examples: the new
boxed set of Mozarts piano concertos by Alfred Brendel: +0.73. The 2008
recording of Bach's Wohltemperierte Klavier by Angela Hewitt: +3.24.
Jazz music has in general (in my collection) a mild negative replay
gain.

So a setting of 100% will only have the right result for those who
don't listen to classical music.


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Re: [slim] Quality loss with ReplayGain?

2010-08-02 Thread cliveb

lasker98;565898 Wrote: 
 This last post about setting maximum volume to less than 100% to allow
 for positive replay gain values makes a lot of sense if the concept is
 correct.
Unless the firmware and/or server has been changed recently, I don't
think this is relevant in the context of the Squeezebox implementation
of Replaygain.

As far as I'm aware, when the bug that allowed positive RG values to
introduce clipping was fixed, it was done in a fairly primitive way, by
simply backing off the RG adjustment according to the peak level. No
account was taken of the playback setting of the Squeezebox itself.
(Example: you have a track with a peak level of -3dB and a RG vaue of
+6dB. With the SB volume set to 100%, the RG adjustment should be
restricted to +3dB. If the SB volume were set to -3dB, you could *in
theory* apply the whole +6dB adjustment. But this doesn't actually
happen: it's still restricted to +3dB).


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Re: [slim] Quality loss with ReplayGain?

2010-08-02 Thread rodorigo

Hi.

Teus de Jong;565943 Wrote: 
 If the volume is set to 100%, there is no room to apply positive replay
 gain.

Could you please explain this a bit?.

The reason is: I have lots of classical recordings from digital radio.
They were originally mp2 with a very low loudness.
So I converted them to flac and added a positive replay gain to
increase the volume without modifying the original audio data.
My output volume is set to 100% to allow ac3 playback and I don't want
to change that.


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Re: [slim] Quality loss with ReplayGain?

2010-08-02 Thread Teus de Jong

cliveb;566069 Wrote: 
 Unless the firmware and/or server has been changed recently, I don't
 think this is relevant in the context of the Squeezebox implementation
 of Replaygain.
 
 As far as I'm aware, when the bug that allowed positive RG values to
 introduce clipping was fixed, it was done in a fairly primitive way, by
 simply backing off the RG adjustment according to the peak level. No
 account was taken of the playback setting of the Squeezebox itself.
 (Example: you have a track with a peak level of -3dB and a RG vaue of
 +6dB. With the SB volume set to 100%, the RG adjustment should be
 restricted to +3dB. If the SB volume were set to -3dB, you could *in
 theory* apply the whole +6dB adjustment. But this doesn't actually
 happen: it's still restricted to +3dB).

Correct me if I'm wrong, but as far as I know this is only the case
when the peak level doesn't allow for positive gain, because it would
cause clipping. So, although primitive, it would only apply to
albums/tracks with a very high peak level.

I looked at the peak level for several classical albums. It seems this
is given as a number between 0 and 1. Most of my classical albums have
a peak level around 0.9. So this would leave 19% volume gain without
clipping.

But maybe this reasoning is totally wrong.


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Re: [slim] Quality loss with ReplayGain?

2010-08-02 Thread cliveb

Teus de Jong;566127 Wrote: 
 Correct me if I'm wrong, but as far as I know this is only the case when
 the peak level doesn't allow for positive gain, because it would cause
 clipping. So, although primitive, it would only apply to albums/tracks
 with a very high peak level.
 
 I looked at the peak level for several classical albums. It seems this
 is given as a number between 0 and 1. Most of my classical albums have
 a peak level around 0.9. So this would leave 19% volume gain without
 clipping.
 
 But maybe this reasoning is totally wrong.
I never understood why the ReplayGain peak tags are expressed as a
number up to 1.0, while their gain tags are in dB - it is bound to
cause confusion. With that in mind, you should be aware that a peak
value of 0.9 is about -0.92dB, which means there is less than 1dB of
headroom to play with.

But let's go back to the way Squeezeboxes implement RG...

In principle, it should be possible to apply a full RG positive gain if
the peak level plus any digital attenuation exceeds the required gain.
For example, if a file's peak level is -1dB and the playback device
also has a digital attenuation of 3dB, then a positive gain of up to
4dB can be accomodated. But this is only what is theoretically possible
- it is NOT how it gets implemented in Squeezeboxes. They ignore the
digital attenuation setting, applying only as much positive gain as can
be applied based solely on the RG peak tag. So in the example here,
you'll get only 1dB of gain regardless of the SB's volume setting.

I initially thought that this was just because the programmers were
being lazy (although at the time it was good that the clipping bug got
fixed at all). However, some time ago, someone (sorry, I forget who)
made the observation that this approach can be considered to make
sense. If the digital attenuation were also taken into account, you'd
end up in the situation where changing the SB's volume control didn't
make any difference to the playback level in some circumstances. That
behaviour would seem a bit peculiar to many users.


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Re: [slim] Quality loss with ReplayGain?

2010-08-02 Thread Teus de Jong

Clive, I hope I understand your reasoning. As I understand it, this
means that with an album peak level of 0.9, the positive gain will be
at most 0.92, even if the RG of the album is +3. It is an extra
explanation (besides the ones I already gave) why RG settings will not
always have the desired result.

I just looked at the tags of one album and I see indeed what you mean:
the album with +3.24 RG I mentioned states:

Album Volume Adjustment: 3.24 dB (1.62 dB to prevent clipping)

So, if I set the digital volume to 90 there would be room to apply the
+3.24 dB, but even then only +1.62 is applied. Is this sound reasoning?


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Re: [slim] Quality loss with ReplayGain?

2010-08-01 Thread lasker98

I realize this is an old thread but I came across it looking for
information on relpay gain. I was trying to find an explanation of why
even with my entire collection of music converted to FLAC and with
replay gain applied (both album and track replay gain) I still notice
variations in perceived loudness when playing random tracks (with
replay gain disabled in sqeezeboz variations are much worse so I know
it's working). This last post about setting maximum volume to less than
100% to allow for positive replay gain values makes a lot of sense if
the concept is correct.
For example, I have a ripped cd with album gain of +1.33db (I realize
1.33 db is negligible but for example purposes). If I have my volume
set at 100%, then there is no room to increase by the 1.33 db? Is this
logic correct?
On the same cd with +1.33 db album gain, I have a track with +5.6 db of
track gain. Would this track gain of +5.6 db have to be added to the
current volume to play back at same comparative volume as other replay
gained tracks? So in effect I would need to have my squeezebox fixed
volume at no more than 94.4% (100 -5.6)to get the proper result of the
replay gain values on playback of this track? 
Obviously I don't have much of an understanding of how exactly replay
gain is applied but this idea of positive replay gain values not being
able to be applied if volume is set at 100% could be the explanation
for the loudness variations I'm noticing.
Thanks,
Bill


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Re: [slim] Quality loss with ReplayGain?

2010-08-01 Thread Teus de Jong

lasker98;565898 Wrote: 
 ...
 For example, I have a ripped cd with album gain of +1.33db (I realize
 1.33 db is negligible but for example purposes). If I have my volume
 set at 100%, then there is no room to increase by the 1.33 db? Is this
 logic correct?
 ...
Yes, that is correct. If the volume is set to 100%, there is no room to
apply positive replay gain.

As to your second question: there is track gain and album gain. SBS
let's you choose between Album gain, Track gain, Smart gain and No
adjustment. 

When you choose album gain, only the album gain value is used. This is
what I use. In general, for classical music it is a disaster to use
track gain: the deliberate volume level differences between movements
would be killed if you used track gain.

Track gain should only be used when using playlists with tracks from
different albums. And don't use it with classical music.

Smart gain is the ideal setting for most people: it means album gain is
used when playing an album, track gain when playing a playlist with
tracks from different albums.

Album gain and track gain are never added (or subtracted): Album gain
is the gain applied to an album based on the measured average volume
level of all tracks on the album. Track gain uses the average volume
level of a track. Both values are based on a the offset of a standard
volume level (I've heard 89dB, but others may be better informed).

For several reasons, using replay gain will not 'equalize' all volume
differences. 1) There is a difference between measured and perceived
loudness. E.g., if you play a single piano at the same measured
loudness as an orchestra, the perceived loudness will be different. 2.
Although replay gain can help getting rid of the ridiculously high
volume of cd's of the last decades, compression applied to the music in
this loudness war will result in a different (higher) perceived volume
while the correct gain correction is applied. (That was exactly the
idea of the loudness war: your song should be perceived as being
louder).


I hope this helps.


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Re: [slim] Quality loss with ReplayGain?

2010-08-01 Thread lasker98

Thanks Teus. I couldn't ask for a clearer response. I'm really surprised
I haven't seen this discussed before. Everything I've read previously
pointed to having Squeezebox volume left at 100%. I've set mine for 95%
and will see how it goes. Thanks again.
Bill


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Re: [slim] Quality loss with ReplayGain?

2010-08-01 Thread garym

It does seem that most (95% I'd say) of my replaygain adjustments are
NEGATIVE. So 100% volume wouldn't be an issue for these.


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Re: [slim] Quality loss with ReplayGain?

2010-08-01 Thread Wirrunna

lasker98;565973 Wrote: 
 Thanks Teus. I couldn't ask for a clearer response. I'm really surprised
 I haven't seen this discussed before. Everything I've read previously
 pointed to having Squeezebox volume left at 100%. I've set mine for 95%
 and will see how it goes. Thanks again.
 Bill

Also thank you from me. Excellent explanation.


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Re: [slim] Quality loss with ReplayGain?

2009-11-09 Thread Teus de Jong

Phil Leigh;483163 Wrote: 
 Yes sorry that was a mistake - what I should have said was, when using
 RG you shouldn't also have lots of digital level reduction. Otherwise
 you may be straying into the low-SNR realm. I reckon that RG of -10dB
 (which is pretty much the max for very loud albums) + -10dB of level
 reduction is probably the safe limit. Even after that it won't sound
 bad...

For people with classical music, it is even important not to set the
volume at 100% to allow for positive gain (which can be used now the
clipping bug is solved). Positive RP is almost always low (the highest I
have seen is +3.5). So I have set the volume to 95%, which seems a save
setting: end result between 82% for ridiculously compressed modern
recordings an 5dB playroom for positive RG.

Teus


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[slim] Quality loss with ReplayGain?

2009-11-08 Thread stefanta650

Hi there!
I have a Squeezebox Classic and most of my music is in flac format. All
these files have the ReplayGain-Tag. As far as I know ReplayGain is just
a tag and does NOT affect the music data itself. So when listening to my
music and applying ReplayGain I was a bit surprised and sort of
disappointed as the music sounded not that clear and bright as without
replay gain applied. So my question is: does applying replaygain affect
the sound quality? If so what can I do to at least reduce that effect
(maybe use an external DAC?). Or are there any other ways to 'normalize'
the volume output?

Thanks for your help!!

Stefan


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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread Phil Leigh

stefanta650;483048 Wrote: 
 Hi there!
 I have a Squeezebox Classic and most of my music is in flac format. All
 these files have the ReplayGain-Tag. As far as I know ReplayGain is just
 a tag and does NOT affect the music data itself. So when listening to my
 music and applying ReplayGain I was a bit surprised and sort of
 disappointed as the music sounded not that clear and bright as without
 replay gain applied. So my question is: does applying replaygain affect
 the sound quality? If so what can I do to at least reduce that effect
 (maybe use an external DAC?). Or are there any other ways to 'normalize'
 the volume output?
 
 Thanks for your help!!
 
 Stefan

RG is just a tag and doesn't change the audio data in your files.
RG simply causes the Classic to reduce the volume via its 24-bit level
control (which is very good quality by the way). 

When using RG, you MUST have the digital level set to maximum. 
RG will reduce the level by -10dB or less. 

The reason your music sounds less good is either:

1) it is just quieter and quieter ALWAYS sounds less clear and bright
or
2) You have the digital level a lot less than max and so the total
reduction in level is too great, eating into the SNR/dynamic range of
the music


-- 
Phil Leigh

You want to see the signal path BEFORE it gets onto a CD/vinyl...it
ain't what you'd call minimal...
SB Touch Beta (wired) - TACT 2.2X (Linear PSU) + Good Vibrations S/W -
MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x
LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Blue
Jeans Digital,Kimber Speaker  Chord Interconnect cables
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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread tot

It does affect the sound quality, but so little that it should be
totally inaudible. It just adjusts the volume in digital domain and
causes noise in the lowest bit(s), but that is below the hearing
threshold.

When you tested, did you compare with identical sound levels?  The
louder always sounds better, even if the difference is very small.


-- 
tot

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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread cliveb

Phil Leigh;483058 Wrote: 
 When using RG, you MUST have the digital level set to maximum.
I normally see eye-to-eye with Phil on most things, but I strongly
disagree with this statement. When using RG it is perfectly OK to use
the SB's digital volume control as well.

Think of it this way: you have a file with a RG value of -3dB. Playing
it with the SB's RG support turned on, and adding an extra 3dB of
digital volume level attenuation is *identical in every way* to playing
it with the SB's RG support turned off and applying 6dB of digital level
attenuation.


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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread Phil Leigh

cliveb;483158 Wrote: 
 I normally see eye-to-eye with Phil on most things, but I strongly
 disagree with this statement. When using RG it is perfectly OK to use
 the SB's digital volume control as well.
 
 Think of it this way: you have a file with a RG value of -3dB. Playing
 it with the SB's RG support turned on, and adding an extra 3dB of
 digital volume level attenuation is *identical in every way* to playing
 it with the SB's RG support turned off and applying 6dB of digital level
 attenuation.

Yes sorry that was a mistake - what I should have said was, when using
RG you shouldn't also have lots of digital level reduction. Otherwise
you may be straying into the low-SNR realm. I reckon that RG of -10dB
(which is pretty much the max for very loud albums) + -10dB of level
reduction is probably the safe limit. Even after that it won't sound
bad...


-- 
Phil Leigh

You want to see the signal path BEFORE it gets onto a CD/vinyl...it
ain't what you'd call minimal...
SB Touch Beta (wired) - TACT 2.2X (Linear PSU) + Good Vibrations S/W -
MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x
LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Blue
Jeans Digital,Kimber Speaker  Chord Interconnect cables
Kitchen Boom, Outdoors: SB Radio

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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread stefanta650

Phil Leigh;483058 Wrote: 
 RG is just a tag and doesn't change the audio data in your files.
 RG simply causes the Classic to reduce the volume via its 24-bit level
 control (which is very good quality by the way). 
 
 When using RG, you MUST have the digital level set to maximum. 
 RG will reduce the level by -10dB or less. 
 
 The reason your music sounds less good is either:
 
 1) it is just quieter and quieter ALWAYS sounds less clear and bright
 or
 2) You have the digital level a lot less than max and so the total
 reduction in level is too great, eating into the SNR/dynamic range of
 the music

Hi Phil!
The digital level IS fixed to maximum level. Of course I adjusted the
volume control of my amplifier when applying the RG. The question is HOW
SB reduces the level. Is is just a digial lowering of the output level
or happens more, let's say some sort of compression or reducing the
dynamic range. I will go into further tests next days...

Stefan


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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread Phil Leigh

stefanta650;483168 Wrote: 
 Hi Phil!
 The digital level IS fixed to maximum level. Of course I adjusted the
 volume control of my amplifier when applying the RG. The question is HOW
 SB reduces the level. Is is just a digial lowering of the output level
 or happens more, let's say some sort of compression or reducing the
 dynamic range. I will go into further tests next days...
 
 Stefan

Stefan
It just reduces the level by adjusting the 24-bit word value internally
- exactly as the digital volume control does. There is NO compression or
limiting.


-- 
Phil Leigh

You want to see the signal path BEFORE it gets onto a CD/vinyl...it
ain't what you'd call minimal...
SB Touch Beta (wired) - TACT 2.2X (Linear PSU) + Good Vibrations S/W -
MF Triplethreat(Audiocom full mods) - Linn 5103 - Aktiv 5.1 system (6x
LK140's, ESPEK/TRIKAN/KATAN/SEIZMIK 10.5), Townsend Supertweeters, Blue
Jeans Digital,Kimber Speaker  Chord Interconnect cables
Kitchen Boom, Outdoors: SB Radio

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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread stefanta650

Phil Leigh;483058 Wrote: 
 RG is just a tag and doesn't change the audio data in your files.
 RG simply causes the Classic to reduce the volume via its 24-bit level
 control (which is very good quality by the way). 
 
 When using RG, you MUST have the digital level set to maximum. 
 RG will reduce the level by -10dB or less. 
 
 The reason your music sounds less good is either:
 
 1) it is just quieter and quieter ALWAYS sounds less clear and bright
 or
 2) You have the digital level a lot less than max and so the total
 reduction in level is too great, eating into the SNR/dynamic range of
 the music

Hi Phil!
The digital level IS fixed to maximum level. Of course I adjusted the
volume control of my amplifier when applying the RG. The question is HOW
SB reduces the level. Is is just a digial lowering of the output level
or happens more, let's say some sort of compression or reducing the
dynamic range. I will go into further tests next days...

Stefan


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Re: [slim] Quality loss with ReplayGain?

2009-11-08 Thread Spies

Stefan,

Perhaps this post by our founder Sean Adams copied to the wiki may
help:
http://wiki.slimdevices.com/index.php/Digital_Volume_Control_and_SNR


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