Hi everybody, I am Dennis Foley from acoustic fields, today we are gonna talk about our
diaphragmatic absorber and how it is unique.
It absorbs a lot of energy in a small amount of real estate.
People ask how did you come up with it and how did you do it.
I broke it down into 3 main parts, we will go over each part today.
The first part is the filter, and the filter as you can see here is 65 pounds of activated
carbon, but It's distributed with 7 smaller filters inside of this thick cavity.
So this is how we give the maximum amount of airflow and exposure to the activated carbon
because the activated carbon has such a high degree of porosity and a large surface area
of coverage, we want to make sure we get as much air movement as we can.
By having it exposed on both sides, individually an individual filters through the whole main
filter we get that kind of impact.
So the fill material of a diaphragmatic absorber gives you the rate and the depth of the absorber
gives you the level of absorption that you can have, so you need to kinda work the two
together to get the performance that you want.
Okay, this is part 2 of our diaphragmatic absorber.
This is the cabinet area, and we have changed the cabinet around a little bit.
I am showing a few of the layers, each cabinet we build has 7 different layers to comprise
the thickness, top sides and bottom.
There are 7 layers of material in that 2 inch cabinet wall thickness.
Each layer is separated by a damping compound, we chose damping compounds and the densities
of each layer of material, they are all different materials to get the vibrational characteristics
in the box, and I came up with that design.
So with all these layers and 2 inches of thickness we get a cabinet that's very inert, very rigid,
and wont' really move at all, and that sets the stage for the front wall to be the most
active participant in this triangle.
So to speak.
So we wanted a very rigid cabinet that's unaffected by low frequency energy as best we could.
We did not want to cabinet moving as much as the air in the room when you have low frequency
issues.
So we went with a very inert design forcing all the vibration on the front two walls which
we will cover next.
This is part 3 of our cabinet discussion for activated carbon absorbers, and this is one
of the most important parts of the cabinet.
Most diaphragmatic absorbers have 1 wall, but we have 2 in ours, and we worked for 2
years to figure out what density to make each wall, what material to make it out of, how
much air space to put between the 2 walls, even the mounting technique is a little bit
different on both walls, so one moves a little bit more than the other, and the airspace
contributes to that movement and it also assists us with the slowing down that energy that
enters the cabinet from the front.
So our low frequency energy which is really particle strikes our dual walls it slows down
then it enters into the cabinet, and based on the discussion of the activated carbon
filter it goes right through that filter.
So obviously some of it goes through the cabinet, and some is reflected back, and some stays
as absorbed, and that's what gives you the rates and levels.
Another thing that you can do with our units is you can add our foam to it or other foams
if you would like, because you have a 2 inch space here behind the fabric, and you can
choose any fabric you want, too.
The dual wall aids us in slowing the low pressure energy down so more of it can enter the inside
of the cabinet where the activated carbon can do its magic.
Thank you.