Yes, egg trays can be very cheap, but sadly they do not work very well
as acoustic treatment.
For damping reverberation, especially the "zing" type reverberation
that is common in empty rooms, heavy curtains, carpets and soft
furnishings are quite effective. Heavy blankets can also be draped
over a simple wooden frame, or hung as curtains in front of bare
walls. (a heavy blanket in front of a wall tends to be more effective
than if attached directly to the wall.
For large rooms there can be a problem with low frequency resonance.
Sound absorbent board in front of the corners of the room can help to
"trap" the bass resonance. Rockwool insulation board has good sound
absorbing properties and is relatively inexpensive. It's not very
nice material to work with - ensure you at least wear a dust mask when
cutting it. The finished boards may be covered in fabric to improve
the appearance and protect the board from flaking. (search the
internet for "bass trap" for more information)
There is a lot of information on the Internet about acoustic
treatment, but be aware that to do it "properly" is a complex and
expensive task. Simple and relatively inexpensive measures such as
hanging heavy curtains can make a significant improvement.
On 22 February 2016 at 04:37, David (Mr Music) <davidfritz678@xxxxxxxxx> wrote:
The cheapest materials to use, home project style, are egg trays!
On 2016/02/21 11:53 PM, David Engebretson Jr. wrote:
I'm curious if anyone is using Audacity for modelling of room reverberance?
I've got a big room I'd like to dampen the reverberance of. It's
40'x60'x16' tall and is used as a cafeteria and auditorium. Usually there
are 50 to 80 children in the room. It is difficult to hear eachother in the
room when people start talking. The noise level builds and builds until an
adult reminds the children to keep their voices down.
The plan is to throw a bunch of baffles and wall board in the room to dampen
the reflections/reverberance, but with a limited budget, we want to make
sure the material we throw at the project is appropriate for the situation.
Any ideas? Accessible software for modelling? Using Audacity to record and
analyze the room characteristics would be great since the Audacity user
interface is so accessible.
All thoughts appreciated,