On Thu, 17 Dec 2015 08:29:00 -0700, mgra...@mstvp.com wrote: >> From: "Marc Lavallee" Date: 12/17/15 9:20 am >> > On Thu, 17 Dec 2015 08:03:33 -0700, mgra...@mstvp.com wrote: >> > The latest Chromecast Audio seems like it could be part of a >> > modular solution. It would take some code to piece it together, >> > but ti's pretty accessible. For those proposing RaspberryPi >> > solutions there is the HiFiBerry DAC which comes in analog and >> > SPDIF output versions. It even comes in a version with a 25w >> > onboard amplifier, but I'm not certain what that gets you. If it >> > could be powered over Ethernet, and achieve suitable output >> > levels, that could reduce the cable requirement to one per >> > RPi+amp+speaker. Wireless is never really wireless when power is >> > something other than batteries. Michael Graves >> >> About Power Over Ethernet: it's good to know that 802.3af is limited >> to 15.3W per device, while 802.3at can provide up to 25.5 W per >> device: http://www.rhyshaden.com/eth_poe.htm > > Indeed. I've used POE for IP phones and surveillance cameras for > years. It's further complicated by upstream power limits of the > network switch. It may only support full power on a limited subset of > its ports. Still, given efficient digital amplification it could > suite some applications. There is a POE shield for the RPi that was a > Kickstarter project...not yet delivering but in process. Michael
The discussion is moving away from audio over wifi, but if ethernet is an option, instead of using POE, a simpler (and possibly cheaper) solution could use 4 wires of the (8 wires) ethernet cable for a 10/100Mbps IP multicast network, 2 wires for 5V power and 2 wires for 12V power; it would required special "in between" splitting RJ-45 connectors at the transmiting and receiving sides. But would it be safe? -- Marc _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
