On 12/17/2015 01:27 PM, Augustine Leudar wrote:
I may have posted it before but maybe things have changed. I do a lot of
multichannel site specific work sometimes I use speakers up to a hundred
metres away from the control center. I currently use Mackie SRM450s and
miles and miles of xlr cable which is inconvenient to say the least (think
cherry pickers and risk assessments that resemble Phd theses etc etc) . Is
there currently any wireless pa or even smaller speakers that can work
wireless (I would love to go wireless on both small and large
isntallations) . I know I can use seinheizer headphone units but I was
wondering if there was a speaker with build in wireless that is relatively
compression free (ie not bluetooth!) plus 32 Seinheizer units plus speakers
is too costly at the moment. All the wirless speakers Ive seen (eg Alto)
only allow stereo - there does not seem to be a system that can deal with
multiple discrete channels. Jorn did you mention such a system ? Anyone
else care to chime in ?
I look forward to the day when I hear the question "Grandad - what's an
audio cable ?"
oh yes :)
when you say "multichannel", and at the same time mention such huge
distances, it would be interesting to learn whether you need fixed phase
relationships between the speakers (as in an ambisonic or stereophonic
playback situation), or have singular sound objects that do not need to
maintain strict timing with respect to their neighbours.
if it's mostly singular speakers each doing their own stuff, i guess
wifi streaming as suggested by marc would be a good option. although
i've never tried multicast outside the lab, and certainly never over
wifi. maybe it doesn't even have to be multicast then, just synchronized
streams on the sender side, and keep the receiver buffers within the
maximum allowable time difference between streams. icecast in
combination with some jack stream source (ezstream or ices2) should do
the job.
when you want to get fixed-phase playback over several receivers, things
get difficult. but maybe just one receiver for each group of speakers
requiring fixed-phase sync would help already?
i've just begun playing with the new raspberry pi 2 in combination with
an edimax 7711-UW wireless usb dongle (each one will cost you less than
50€ including psu, case, and sd card).
there's the problem that the onboard sound is crap and there's no usb
2.0, so i'm using the HDMI audio out (eight channels) in combination
with something like
https://www.ligawo.eu/ligawo-6518770-hdmi-audio-extractor-dac-7-1-5-1-2-0-analog-audio/a-6518770/
haven't measured this thing yet (i'm not using it for anything
critical), and it sure isn't great but usable, and for the price who'd
complain.
one of those would enable you to run third-order horizontal ambisonics
over wireless without jumping through fiery hoops.
all best,
jörn
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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