Hi everyone, Dennis Foley from Acoustic Fields.
Today we're going to talk about room width as being very wealth, wealthy if you will.
I mean it's a good dimension to have in your favor because boy, in North America at least
the rooms that I see every day, it's that 8-foot ceiling height and you know, that's
one of the worst dimensions in acoustics we could ask for.
Thank God, in a lot of cases it's not the actual height, it's the drop ceiling height.
We have another foot or two above that if we look structurally but a lot of times, not
the case, it's 8 foot.
So where else do we go?
Well, we've got to get the width and we've got to get the length if we don't have the
height.
So the room width really impacts a lot of variables that we use for evaluation, especially
in 2-channel stereo.
So we take a big picture look, if we take a macro level view, it's image, focus and
position and that's what we're trying to do with the sidewall implication.
So we want to make sure that we have good definition, we have good separation, we have
focus.
And that's all related here: definition, separation, focus for our center channel image is all
in this signal here.
So we have to be real careful with that and we have to treat it with care.
So time signature, absorption.
If we're going to use absorption and we do most of the time because it gives us the definition,
separation and focus that we want in our central channel image and then we add air and more
separation with diffusion on other surfaces.
But let's take a look here.
If we have our regular speakers, our left and our right channel here, we have one distance
for primary in this case but if we take the right channel and we start to move it closer
to the room boundary surface we're going to change one, the angle, we're going to change
the time signature and we're going to change the distance.
So it's time, energy, frequency that we're always concerned about.
So as we move closer to the room boundary surface we increase pressure, we change the
time signature or the reflection and all of this has an impact on our definition, separation
and focus.
So you have to be real careful.
This was the primary reason I created my foam technology.
Because I had tested all the foam technologies in the marketplace back in the 90's and none
of them gave me that kind of definition that I knew 2-channel stereo was capable of producing,
not one worked in my opinion as advertised.
So what did I do?
I created a new curve, a new absorption curve that is more for music and voice.
Because they're special and they have to have special treatments, okay?
We perceive music and voice a lot different than we do other things.
So the rate and level of absorption of the absorption material that we use on the sidewalls
is critical.
So the more width we have in the room, the more flexibility.
Obviously if we could get room width way out here, maybe even become an opportunity for
no treatment.
Because it would be far enough away that we didn't have to manage it that correctly, other
issues would then come into play.
And we know that that width-height ratio is really small sometimes in our room so we have
to be really careful there because then we add all kinds of low frequency pressure issues
into the room.
So room width is wealth if you have to have a dimension that's one, that's large, let's
look for the width and especially with our 2-channel systems.
Thank you.