15 Aug
2017
15 Aug
'17
2:56 p.m.
Hi list,
I am searching for tool that would allowed me to align sound system.
I would like send sound impulse to one speaker and get delay time (ms)
based on captured signal by measurement mic.
For top speakers impulse could be about 2.5 kHz I guess.
A bit more complicated situation could be for aligning top speaker and subs
probably impulse of crossover frequency would be necessary.
That mean 60Hz 80Hz or 100Hz depend on system XO.
Any suggestion how to achieve this? GUI CLI whatever?
best regards
mira
15 Aug
15 Aug
10:15 p.m.
On Tue, Aug 15, 2017 at 02:56:32PM +0200, Jaromír Mikeš wrote:
I am searching for tool that would allowed me to align
sound system.
I would like send sound impulse to one speaker and get delay time (ms)
based on captured signal by measurement mic.
Practical solution:
For a small (living room) system, just use a tape measure.
For a big one (PA system), use a laser rangefinder.
Then divide by speed of sound (343 m/s) in normal conditions.
Ciao,
--
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
10:35 p.m.
2017-08-15 22:15 GMT+02:00 Fons Adriaensen <fons(a)linuxaudio.org>rg>:
On Tue, Aug 15, 2017 at 02:56:32PM +0200, Jaromír
Mikeš wrote:
Well ... that's what I usually do :)
But is not always enough ... with big system in outdoor there is a problem
to measure with laser on sunny days.
Yes there are expensive solutions like for e.g. from Leica which works up
to 200m on sun ... price about 500$
Also there is one other problem ... when you align top speakers (flying)
with subs (stacked) I believe 15'' from "tops" having faster reaction
than
18'' from subs.
And one more problem ... system I am working with having some delays on
factory presets ... Yep they are documented in charts ...
But anyway would be nice to have a tool to verify own calculation.
best regards
mira
I am searching for tool that would allowed me to
align sound system.
I would like send sound impulse to one speaker and get delay time (ms)
based on captured signal by measurement mic.
Practical solution:
For a small (living room) system, just use a tape measure.
For a big one (PA system), use a laser rangefinder.
Then divide by speed of sound (343 m/s) in normal conditions.
16 Aug
16 Aug
1:19 a.m.
Am Dienstag, den 15.08.2017, 22:35 +0200 schrieb Jaromír Mikeš:
But is not always enough ... with big system in
outdoor there is a
problem to measure with laser on sunny days.
I thought, you need an acoustical rather than an optical tool to
measure your speakers?
Greets!
Mitsch
6:25 p.m.
2017-08-16 1:19 GMT+02:00 Michael Jarosch <riotsound(a)riotmusic.de>de>:
Am Dienstag, den 15.08.2017, 22:35 +0200 schrieb
Jaromír Mikeš:
Short answer is ... both ;)
mira
But is not always enough ... with big system in
outdoor there is a
problem to measure with laser on sunny days.
I thought, you need an acoustical rather than an optical tool to
measure your speakers?
12:33 p.m.
Le Tue, 15 Aug 2017 22:35:41 +0200,
Jaromír Mikeš <mira.mikes(a)gmail.com> a écrit :
Also there is one other problem ... when you align top
speakers
(flying) with subs (stacked) I believe 15'' from "tops" having faster
reaction than 18'' from subs.
Or the cheap filters used to split the different frequency ranges
doesn't respect the phase of the signal. (good filters in that
regard can be very complex and expansive - it is one of the most
complicated issue in electronics) Which give what you describe here:
And one more problem ... system I am working with
having some delays
on factory presets ... Yep they are documented in charts ...
With different speakers, what make the delay between them is phase of
the signal. That phase is not dependant of the speaker size, but of the
(lack of) de-phasing into the frequency splitter and of the mechanical
alignment of the coil of the speakers (they must be on the same vertical
plan). The difference between a 15'' and a 18'' will be the dynamic.
15'' or less will be good for funky music or jazz rock, when 15'' or
18'' will be good for rockabilly.
In outdoor conditions you can also get issues with
reflections which can give you a lot of issues like larsen, or multiple
sound paths from the speakers to the public.
Cheers,
Dominique
7:05 p.m.
2017-08-16 12:41 GMT+02:00 Dominique Michel <dominique.c.michel(a)gmail.com>om>:
Le Tue, 15 Aug 2017 22:35:41 +0200,
Jaromír Mikeš <mira.mikes(a)gmail.com> a écrit :
In outdoor conditions you can also get issues with
reflections which can give you a lot of issues like larsen, or multiple
sound paths from the speakers to the public.
You meant "indoor" here I guess ... open outdoor is usually much better for
reflections.
mira
18 Aug
18 Aug
2:37 a.m.
Le Wed, 16 Aug 2017 19:05:02 +0200,
Jaromír Mikeš <mira.mikes(a)gmail.com> a écrit :
2017-08-16 12:41 GMT+02:00 Dominique Michel
<dominique.c.michel(a)gmail.com>om>:
It can also append outdoor. Here in Switzerland, it is the Paleo
Festival in July. Some years ago, peavey made the sound system of
the main stage. They was very surprised by how easy it was to put
the whole system in larsen. The problem was not the forest that was in
the front of the stage at the back of the mixing table, but the water
closed at the left of the stage. It was not possible to move that WC,
so a few years later, they moved the whole festival to a new location
and that larsen issue was solved.
Dominique
Le Tue, 15 Aug 2017 22:35:41 +0200,
Jaromír Mikeš <mira.mikes(a)gmail.com> a écrit :
In outdoor conditions you can also get issues with
reflections which can give you a lot of issues like larsen, or
multiple sound paths from the speakers to the public.
You meant "indoor" here I guess ... open outdoor is usually much
better for reflections.
mira
11:43 a.m.
On Fri, 18 Aug 2017 11:03:52 +0200, Michael Jarosch wrote:
Am Freitag, den 18.08.2017, 02:45 +0200 schrieb
Dominique Michel:
Hi,
"Audio feedback (also known as acoustic feedback, simply as feedback,
or the Larsen effect) [snip] The principles of audio feedback were
first discovered by Danish scientist Søren Absalon Larsen, hence the
name "Larsen Effect"." - https://en.wikipedia.org/wiki/Audio_feedback
Regards,
Ralf
to put the whole system in larsen
Could't find a translation for "larsen". What does it mean?
19 Aug
19 Aug
2:29 a.m.
Am Freitag, den 18.08.2017, 11:43 +0200 schrieb Ralf Mardorf:
"Audio feedback (also known as acoustic feedback,
simply as feedback,
or the Larsen effect) [snip] The principles of audio feedback were
first discovered by Danish scientist Søren Absalon Larsen, hence the
name "Larsen Effect"." - https://en.wikipedia.org/wiki/Audio_feedback
Ah, okay! Thanks!
Greets!
Mitsch
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10 comments
5 participants
participants (5)
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Dominique Michel -
Fons Adriaensen -
Jaromír Mikeš -
Michael Jarosch -
Ralf Mardorf