Thanks John
It does look interesting but I couldn't find anyone selling it yet on a google search. Presumably that means the first production bath is still unsold?
How about adding a good linear PSU to the pre-box, would it improve soundquality?
Possibly silly question but does plugging headphones in mute the preamp output? The otherwise interesting Schiit Jutenheim and my very old Cyrus One don’t and it’s a real pain.
Two questions for JohnW:
Are there coupling capacitors in the signal path?
JohnW, what is inside ProJect Pre Box S2Digital, your original design or ProJect's modification?
Thanks!
Are the analog outputs of the DAC chips directly connected to the RCA analog outputs?
No - theres a buffer IC.
Hell no!!! - DC coupled
does not have balanced outs that my amp has (Bryston) can use RCAs but would be nice if it was balanced
hi Julf, yes you are right - will do that in the future, but i doubt that would eliminate the pops/clicks ?As I keep pointing out, you get most of the benefits of a balanced connection as long as the amp input is balanced / differential, and you use a cable with a RCA at one end, but wired as a differential (2 + shield) from the RCA connector on.
hi Julf, yes you are right - will do that in the future, but i doubt that would eliminate the pops/clicks ?
yeah i suspect that can be only explanation (DC offset) ... i tried headphone output in the meantime ... still can hear pops/clicks though they are more quiet then music being played so it does not create a big problem. however, i don't like the idea of opening brand new DAC and soldering some extra (i guess it would need to be few micro-farads high quality capacitor) and i think JohnW mentioned it's DC coupled so adding it at the end would beat the purpose.I agree, the cable is unlikely to have anything to do with the pops and clicks. If you get them with one amp, but not with another, I would suspect a DC offset on the DAC output (that one amp is sensitive to, but the other isn't). Maybe worth trying with a capacitor to decouple DC?
however, i don't like the idea of opening brand new DAC and soldering some extra (i guess it would need to be few micro-farads high quality capacitor) and i think JohnW mentioned it's DC coupled so adding it at the end would beat the purpose.
Does anyone know if that is something that could be addressed by (future) firmware upgrade ? i.e. if DAC has left some offset in the output it could be taken to 0 via SW.