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December 2019 Bob Dylan with Johnny Cash Bootleg Series 15

12/24/2019

 
This month we will look at a new release of recordings made in the late 1960s.  The session is from the time that Johnny Cash visited Bob Dylan and they recorded a number of songs.  The technology is certainly dated but we will look at how well it was mastered and presented to us in 2019.

The numbers for the song we will look at (Just A Closer Walk With Thee) are as follows...

LKFS/LUFS                       -21.5 dB
Clipped Samples Left            0
Clipped Samples Right          0
DC Offset                       +0.000%, 0.000%
Dynamic Range                9.1 dB
RMS Level Left              -20.51 dB
RMS Level Right            -21.50 dB

The first thing you notice is that the LUFS level is -21.5, which is what most vinyl records were at the time that these recordings were made.   The true peak maximum is -4.6, so they could have raised the entire level up by about 3.6 dB without altering any waveforms.  This would result in an overall level of -17.9 dB.  It is very unusual to err to the low side of -16 dB, but -16 dB would have been very possible with this material. 

Of course at that level there are no clipped samples and also the DC offset is a rare perfect 0.  The dynamic range is good at 9.1 dB and the level difference shows us that the left channel is 1 dB louder than the right.  Overall it is a good representation of how it would have sounded on equipment at the  time it was recorded in the late 1960s.  The fact that the mastering engineer resisted the temptation to slam the material as we are accustomed to seeing is a very encouraging sign.  

This will end our monthly look at new releases.   There is more than enough material in these blogs to see what the modern state of mastering is like.  The vast majority of entries reveal a profound lack of finesse by the majority of successful mastering engineers.  The entries for October and December are encouraging signs that there are still some out there who care about doing a good job.   We started doing this in March of 2015 and for nearly 5 years have chronicled the state of the audio mastering world.   We hope that those of you who have followed along have learned something.   
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Dan-luc
12/28/2019 11:24:34 am

Thanks for these informations and analysis, that's very informative and precious.
By the way, what are for you good values for a modern vinyl?the perfect specs for a perfect sounding records?
best regards.

Charles Brooks
1/1/2020 03:25:59 pm

This is the outline of what the music should look like by the numbers.

​True Peak level -1 dB
LKFS/LUFS level -16 db
DC Offset 0.000 dB
Clipped Samples 0
RMS level difference for left and right channels less than a dB, or less than .1 dB, or less than .01 dB even better
Equalization curve without obvious flaws

Proper mastering is good for every medium. Some vinyl will not handle -16 dB and you might have to go to -20 dB.
Otherwise it is the same.

Good luck.


Comments are closed.



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