On 03/23/2016 10:30 PM, Dave Malham wrote:
Hi Martin (and Eric!),
One very simple thing I would do, before doing anything else, with any
system that's playing, as we say, silly bu..ers, is just to play a well
localisable sound out of each speaker (on its own) in turn and check that
(a) it's coming out of the speaker it should (all connections are correct)
and that it sounds like it's coming from the direction you think it should
(acoustics not too disruptive). If you really want to be picky, stick a
soundfield type mic at the nominal centre point and check correct B format
signals are produced for each speaker location at the same time. Only then
start worrying about decoders, plugin connections and the rest. I once
worked out that in a simple 1st order system driving a cube of speakers,
there are 16 million ways of it going wrong, without counting individual
component failures in amps, etc. Of course, lots of these ways of going
wrong are self cancelling (*both* ends of speaker cable can be connected
wrongly, cancelling out the polarity inversion, for instance) which is a
darn good job otherwise our job would be near impossible. So, checking the
simple things first is a good way to avoid delving around the complex..
in good old steve ballmer tradition: "polarity, polarity, polarity,
polarity, polarity, polarity..."
if you can't measure it directly, i found it useful to use a stereo
phantom source between a reference speaker and the speaker under test.
--
Jörn Nettingsmeier
Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487
Meister für Veranstaltungstechnik (Bühne/Studio)
Tonmeister VDT
http://stackingdwarves.net
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