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On Sunday 26 June 2011 18:05:12 J=C3=B6rn Nettingsmeier wrote:

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> On 06/26/2011 05:47 PM, Arnold Krille wrote:

> > On Sunday 26 June 2011 11:58:54 J=C3=B6rn Nettingsmeier wrote:

> >> On 06/26/2011 10:50 AM, pshirkey@boosthardware.com wrote:

> >>>> Other than that, I'd make a really cool spectrum analyzer that ran t=

he

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> >>>> Fourier analysis on two channels, correlated their phases then made a

> >>>> +/- line vs. frequency for all to see so that the phase of the

> >>>> components of the spectrum could be watched for phase relationships.

> >>=20

> >> that is precisely what dual-fft tools for p.a. system calibration do,

> >> and they're extremely useful.

> >> they allow you to constantly monitor the system with _program_ materia=

l,

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> >> without having to use MLS noise or any other specific measurement

> >> signal. one channel is used for the direct signal from the mixer, the

> >> other is fed by a measurement microphone with delay compensation. you

> >> get instant phase and amplitude response. good systems also give you an

> >> additional "confidence" curve that tells you how much you can trust

> >> which parts of the spectrum. for instance, if your program material is

> >> a boy soprano, the confidence of the measurement in the low end is

> >> practically zero.

> >=20

> > I use(d) japa for this :-) Altough that lacks phase display...

>=20

> it will do the job nicely in its difference setting, but you have to

> find (and compensate for) the delay manually, like a real man.

> modern p.a. tools allow sissies like yours truly to just click on the

> "find delay" button and be done :-D

The venues I used japa in are small enough and the music slow enough to jus=

t=20

use the second-slowest settings from japa and call it a day. :-D
But a PA setup helper with speaker-managment and x-over and convolver-engin=

e=20

is probably one of the killer apps linux audio is missing.

But then again, real men use jconvolver, drc and aliki to adopt for the roo=

ms=20

and PAs defficiencies. Unless they calculate the correction responses by ha=

nd...
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