2017-08-15 22:15 GMT+02:00 Fons Adriaensen <fons@linuxaudio.org>:

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.

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