09-Mar-2021, 18:25
(09-Mar-2021, 13:43)ragwo Wrote: @streamy
Have you been able to perform some measurements with DOS1?
No, not yet. If possible @struts will lend me his UMIK-2. Then I will perform the measurements. In my initial tests with specific hires sine signals of 25kHz @96k or 192k sampled did not play in DOS1 through optical in (played in Roon to an RPi4 HAT) and also not in Spark. The muting of the output stage leading to total silence of the tweeters indicated this to me. That muting did not happen with 22kHz or lower freq sine signals. Interestingly, the 25kHz signal played through UPNP and also when I played them switching the Gold Phantom to optical direct and feed with the RPi4 HAT. Then I can hear the low level noise of the amp (with ears close to the tweeter). This gives me the hope that something of the 25kHz gets out of the tweeter when playing a hires 96k or 192k file. But this I need to record with the UMIK-2 once I have access to one.
