Hi Thomas,
One thing I'm trying to find out about using AVB is (in your example) does Box 1 (connected to the PC by USB 2.0) need to be the same number(s) of circuits as Box 2?
In other words, thinking of using a AVB MOTU 24Ao as the output Box 2 (next to the power amps), can a smaller AVB box such as a MOTU Ultralite AVB be used as the AVB "interface from the PC": as Box 1 along with the 24 Ao as Box 2 on the other end of the Ethernet cable? Will H/W be able to "connect" to those 24 output channels of the 24Ao.?
Lots of info on this page
http://motu.com/avb/avb-faqThere is an option of a dedicated, internal (PC to AVB) card from Echo that is meant as a connection from a PC to AVB Ethernet, the
Streamware NIC-1 licenced for 16 channels at $800.
https://echoavb.com/products/streamware-nic-1.
Rgds,
Ed