Hi everyone, my name is Adriano and I write from Italy.
I would kindly have some questions about the various ways to attenuate the signal coming from the D30pro Topping DAC that goes into the preamplifier with a sensitivity of 270mv. Being very sensitive I have a hard time listening at low volumes and then it seems to me that if I turn up the volume a little the amp goes into saturation too soon. Hence the need to attenuate the signal from the DAC.
I state that I use Roon, I move on to the questions:
I understood that without using any volume adjustment on Roon I get a bitperfect signal, while if I use DSP volume it is no longer bitperfect, but I don’t seem to hear any difference. right?
If I use “device volume” , Roon tells me it’s going bit perfect, but is it really like that? I mean, once the DAC does digital attenuation it’s no longer bitperfect right?
If I use “fixed volume” and then use the DAC knob to regulate volume, am I attenuating in the same way as the previous point?
Is it possible that the digital attenuation of Roon is better than that of the DAC (or vice versa) or are digital attenuations are all the same?
That’s true, but I wrote “If there is digital volume control in the DAC”, based on the OP’s “once the DAC does digital attenuation”. In your case it would not be a digital volume control but a digitally controlled analog one. If the OP has that in the DAC, it’s certainly worth considering. Now where is my Naim Statement
Naim Statement has this for example (and the new NSC222 that inherited it), in this case a switched resistor volume control. The volume is adjusted in the analog domain by reed relays, but the switching of the relays is controlled digitally. So you can have an analog volume control but can do digital volume adjustment from an app, e.g. within Roon.
There are other ways to do that (you could have a simple analog potentiometer that is turned by a digitally controlled motor)
What kind of a preamp is overdriven by a standard 2 V single ended output from a DAC? Are you familiar with voltage sensitivity specs and citing this figure properly? Are you actually experiencing issues or just being overly concerned?