Huh. What i'm looking at purchasing are a bunch of these https://www.genelec.com/studio-monitors/sam-studio-monitors/8430a-ip-sam-studio-monitor  for an ambisonic setup.  They have a Ravenna input and they can be run in mono or stereo.  Looking at the manual ( https://www.genelec.com/sites/default/files/media/Studio%20monitors/SAM%20Studio%20Monitors/8430A/8430a_opman_ip.pdf ) it states "There are some requirements for the AE67 network. The network must run a clock source supporting the Precision Time Protocol according to the format defined in IEEE 1588-2008. Several audio sources and media IP switch devices can act as PTP clock sources for the network. It is also useful to make sure that the IP switches delivering the audio streams have been configured to prioritize the PTP clock messages and the RTP audio streams over other traffic."

From what you're saying i'd need to output the software stream from my computer using a secondary ethernet port into a ptp router then into my speakers.  

Why would i need to buy an expensive router? Why not just build my own router using http://linuxptp.sourceforge.net/ or https://github.com/ptpd/ptpd  
How does Jack2 (dbus) fit into all of this?

It seems like the ptp software above can connect multiple computers, so i could just start out with a mini-pc with a 4 jack ethernet card and add more mini-computers as i need to yes?

Or am i completely confused?

Thanks

On Sun, Jul 16, 2017 at 9:35 AM, Len Ovens <len@ovenwerks.net> wrote:
On Sun, 16 Jul 2017, Hanspeter Portner wrote:

On 16.07.2017 02:13, Len Ovens wrote:
to sync your internal audio card to an external ntp server. This accuracy pretty
much requires a HW ntp server. As I said the intel i210 ethernet cards at
$60-ish seems to be about the cheapest route.

It think it should be PTP [1] instead of NTP above, the latter is not accurate
enough.

Thats what I get for answering off the top of my head from a camp site  :P

PTP can also be run in software timestamping mode, hardware timestamping will be
more accurate, though [2].

I am not aware of anyone managing to get sw mode to be accurate enough to derive wordclock from.

[1] https://en.wikipedia.org/wiki/Precision_Time_Protocol
[2] http://linuxptp.sourceforge.net/

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Len Ovens
www.ovenwerks.net


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