Sommation analogique ou numerique ?

Hello,

Mixing ITB, i'm about upgrading my studio and currently interested in summing box.

I know your great work as a gear supplier in the audio industry, though i would like to know more about your PM8.

In fact, before buying i would need to understand what would be the sound improvement in using analog summing.

Trying to compare Analog summing with digital summing, on the product page description you wrote something that trouble me.

As far as i've understood, digital summing in a DAW is as easy as an addition. Having two audio clips to sum, the DAW just stores Digital samples in two tabs, one for each clip, and just add the sample each other, line by line and figure out the results : the stereo track. The digital summing process should not be no more hard to understand than 2+ 3=5.

The following sentence you wrote on your webpage and way of thinking looks weird to me :

The DSP required to sum individual channels into a stereo pair is prone to clock-based errors and mathematically unrelated signal artifacts, something avoided entirely by mixing down in the analog domain.

When bouncing offline, the computer CPU just makes an addition which looks like an Excel addition function. It is offline, thus there is no clock in this process, besides that is not an audio process, it is just a mathematical process as every computer makes every day everywhere in the world. I do not understand how an basic offline digital addition could affect the audio.

IMHO, digital summing is perfect in term of mathematical process. A perfect addition does not mean that it's is more pleasant to our ears, but the digital summing seems to be clear and simple, like my 10 $ calculator could do.

So I kindly ask you to clarify this point to me.

Thank you in advance for your answer. I do not want to create a new Gearslutz thread about that, I prefer directly get your answer.

Je suis assez d'accord mais pour fabriquer des horloges il est quand même indispensable de connaître son affaire.

Pas besoin d'être sur PT. Le test doit fonctionner sur n'importe quel DAW.

Any time a mathematical process must be performed within a computer, there are thousands of logic gates that switch on and off at a high rate of speed.  This process creates a harmonic signal that feeds through to the digital data signals (each digital audio track contains three signals; bit clock, word clock, and data clock) causing signal jitter.

A second reason is related to signal volume.  If you ask a delta sigma DAC to reduce its output from full-scale, you also force it to reduce bit depth.  By keeping all DAC's at full-scale output, you come closer to achieving the converter's maximum real-world bit-depth.

ben ça c'est faux, il suffit de faire des test de summing....

Any time a mathematical process must be performed within a computer, there are thousands of logic gates that switch on and off at a high rate of speed.  This process creates a harmonic signal that feeds through to the digital data signals (each digital audio track contains three signals; bit clock, word clock, and data clock) causing signal jitter.