sergioTOOL
2010-03-02 16:37:05 UTC
Hi
When designing an auditorium where sound will mostly be played through
the PA system, the sound designer asks the acoustician for a pretty
"dead" room, say Rev Times of 1sec. As always Mid and high Frequencies
are easily delat with. However bass frequencies are far harder to
absorb. Lets also think of a very good and expenssive PA system will
be used hence Reverberation can be "recreated artificially" when
required.
My assumption and question and here´s where I would like some input
from some of you who know far more than I do:.
My thought would be to treat the whole ceiling by installing a dropped
ceiling made entirely (or mostly) of 2" or 3" absorber. There would be
an air gap of say 5" between the dropped ceiling and the roof. The
principle behind this is that if you leave an air gap between the
absorber and the hard surface your absorber deals better with Low
frequencies (this has to do with the particle velocity of the of the
sound wave approaching a wall and its wavelength, bla bla bla).
So far, is it a good idea?
Ok, say we are talking of a 20m (wide) by 30m (long) by 7m (h) room.
If the whole dropped absorber ceiling cannot be built for whatever
reason, but you are still allowed to treat the top side corners. Would
it still be a good idea to install an absorber dropped ceiling along
the side corners from front to rear? Taking into account the fact that
Low frequency energy tends to cluster in corners (never understood
this one but take it as a fact). And if possible may be do the same on
the wall corners (as it is done in recording studios)?
I would really appreciate any input, or referrals to links, forums or
books where this is dealt with.
Many thanks guys.
Chao
Sergio
When designing an auditorium where sound will mostly be played through
the PA system, the sound designer asks the acoustician for a pretty
"dead" room, say Rev Times of 1sec. As always Mid and high Frequencies
are easily delat with. However bass frequencies are far harder to
absorb. Lets also think of a very good and expenssive PA system will
be used hence Reverberation can be "recreated artificially" when
required.
My assumption and question and here´s where I would like some input
from some of you who know far more than I do:.
My thought would be to treat the whole ceiling by installing a dropped
ceiling made entirely (or mostly) of 2" or 3" absorber. There would be
an air gap of say 5" between the dropped ceiling and the roof. The
principle behind this is that if you leave an air gap between the
absorber and the hard surface your absorber deals better with Low
frequencies (this has to do with the particle velocity of the of the
sound wave approaching a wall and its wavelength, bla bla bla).
So far, is it a good idea?
Ok, say we are talking of a 20m (wide) by 30m (long) by 7m (h) room.
If the whole dropped absorber ceiling cannot be built for whatever
reason, but you are still allowed to treat the top side corners. Would
it still be a good idea to install an absorber dropped ceiling along
the side corners from front to rear? Taking into account the fact that
Low frequency energy tends to cluster in corners (never understood
this one but take it as a fact). And if possible may be do the same on
the wall corners (as it is done in recording studios)?
I would really appreciate any input, or referrals to links, forums or
books where this is dealt with.
Many thanks guys.
Chao
Sergio