On 13.11.19 21:59, Len Ovens wrote: > On Wed, 13 Nov 2019, Giso Grimm wrote: > >> Dear linux-multichannel-audio-users, >> >> we are running a setup with two RME MADI cards to drive a system with >> approx. 100 playback channels. We are using jack2 and zita-j2a to >> achieve a sufficient number of playback channels. The sample clocks are > >> On a similar setup (with two different card types) I noticed that the >> latency between the cards is fixed as long as jack/zita-j2a is running, >> however, the latency differs between starts of jack. This seems also be >> the case in the setup with two MADI cards. > > USB cards by chance? This is a known problem with USB Audio. Well > actually with USB in general. I am coming to the realization USB audio > devices are not desirable for profesional audio. They are sort of the > best one can get on a limited (reasonable?) budget. It is unfortunate > that USB has become the way periferals are added on modern computers > when it comes to audio. USB is great for many other things from printers > to mice, but not really critical audio. no, PCIe (and RME MADI hdspe cards are far from being budget - although quite cheep compared to over 100 loudspeakers and corresponding DA-converters :-) ). Sample clock sync works perfectly. The only response I got from RME is "it works on Windows without any latency differences" - however if I understand it correctly in this case the interrupts of the two sound cards need to be somehow synchronized with sub-sample precision. > > > > -- > Len Ovens > www.ovenwerks.net > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > https://lists.linuxaudio.org/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
