keith

jasonthurley


Here is a better example than I can explain in text...

http://www.conradaskland.com/blog/2008/10/decibel-levels-and-perceived-volume-change/

Yes, it says it right at the top... +3dB doubles acoustic power, not SPL. Your calculations are from the sound source, not the listeners ear, right?

inverse square law should double the voltage produced by the microphone, giving a +6 dB increase in amplitude (which also produces four times the intensity).

That is Quadruple the power.... .... yes 6dBV is double AMPLITUDE.... is that what you see on your Sonar meters....??

The thread is about bus and metering not SPL, so yes I am referring to the sound source... however... here is more info on SPL using an SPL meter:

If we double the number of speakers we will increase the SPL by 3dB. Here is an example. If you have a 50 watt amp with one 12" speaker and you add another 12" speaker you will get the magic 3dB increase. You would have the same SPL as a 100 watt amp with one 12" speaker. To get the next 3dB increase we need to double the speakers again so we would need four 12" speakers. Having 4 speakers will give us a 6dB increase in SPL compared to 1 speaker. Sounds like the same system as the power ratio above doesn't it. Here is were the complex part comes in. If we double the 4 speakers to 8 speakers you would think that there would be a 9dB increase in SPL compared to one speaker, right? Nope. What we get is only a 6dB increase compared to one speaker. Huh? We have now introduced a new factor to this equation...Phase Cancellation. 


Some meter info that might be helpful.... and also help explain the meter differences in mathematics and what you see happening in your DAW

Pan Law compatibility mode
When using a non-default pan law with floating or 24-bit audio, SONAR would previously apply the pan law twice; once at the clip level and once more at the track level.

In SONAR 8.5.2 and later, pan laws are only applied once at the track level and only for mono tracks.  Any clip pan envelopes will continue to work, but behave strictly as a balance control.

If you have existing projects that use a non-default pan law (i.e. other than "0 dB center sin/cos taper"), the mix might sound louder in SONAR 8.5.2.  To address backwards compatibility with projects that were mixed in previous versions of SONAR, the following AUD.ini variable is available to set the pan law compatibility mode:

PanLawCompatMode=<0 or 1> (default=0)

This variable should set in the [Wave] section, for example:

[Wave]
PanLawCompatMode=1

When the value is 0 (default), non-default pan laws are not applied at the clip level.  Clip pan envelopes always use the 0dB center sin/cos taper law.

When the value is 1, pan laws are applied at the clip level.  It is not recommended that you use this value unless you need to retain backwards compatibility with pre-SONAR 8.5.2 projects that use a non-default pan law.

Using a bus send to "fatten" up a sound only works if you alter the sound in some way... otherwise you just increase the volume.

Anytime you send a"copy" ie, insert send, to a buss that routes the copy back to the original will increase the volume.......

...wicked


Did you hear that +3dB sound just now? It was my head exploding.

I hope you recorded it.... I have been awaiting a new explosive kick drum sound...

brundlefly

yes 6dBV is double AMPLITUDE.... is that what you see on your Sonar meters....??

Yes. SONAR meters amplitude. If you sum two identical signals, both peak and RMS amplitudes will double, and SONAR will show a 6dB increase vs. one signal alone. If, however, you sum two uncorrelated signals, SONAR will show the expected 3dB increase.


This whole debate is based on the difference between summing identical vs. uncorrelated signals. You continue to ignore this simple explanation for the difference between what you expect, and what SONAR (correctly) shows when you do what the OP described.

It's that simple.

Gotcha....