Originally Posted by bigguyca
(1) Why does the use of two ESS9028 DAC IC's imply that the output is unbalanced. Please explain.
(2) The design you are describing is commonly used, and is a perfectly valid way to produce a balanced signal for transport over balanced cables from an XLR output. Balanced means equal impedance to ground from each conductor. The circuit you are describing will produce a balanced signal if designed correctly. Please explain in depth why the circuit you have described will not create a balanced signal.
(3) Based on your brief descriptions, either of these methods are the most commonly used volume control methods in the products normally discussed on this forum.
Thanks for your response. My original post was perhaps not as clear as I had thought at the time.
What I am trying to determine is if the internal architecture is "fully", "truly" or by whatever other term takes your fancy, balanced from the output of the DAC to rear panel XLR connector.
1) It is my (quite possibly flawed) understanding that in order for the analog signal path to be balanced from source to output connection it requires the use of two DAC's per channel. One each for the positive and negative half of the waveform. In the case of a 16ch processor this would mean 32 independent DAC channels. Two 8ch ESS9028 DAC IC's clearly does not meet this criterior.
2) I was not proposing that a balanced output could not be derived via appropriate circuitry from a single DAC channel or indeed that it was in any way uncommon to do this.
As mentioned above I was trying to determine if the entire signal path was balanced. Please understand that I am not trying to argue for one implementation or the other I was simply seeking clarification of what the internal architecture is.
3) Again, not arguing for one method over the other. Just trying to determine whether the volume control is done in the digital or analog domain or possible even both?