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Introduction
Architectural acoustics? It seems simple but wasn't until now ! Why?
Do you have
clean and clear sound, full dynamics, no booming, real life wide sound stage, no
coloration? All this must be fulfilled simultaneously! It is hard to believe
that this is easy to be found, so, the Roundffusor1 is the unique, patented
answer.
The
R1-the standard or the ''any surface/portable model'', will bring your recording
& mixing sessions and your live acoustic performances there where you always
dreamed-to the naturally perceived sound .
For
normal rooms, of about 15-24 square meters, 9 or 15 R1 are enough, to be grouped
mounted behind the loudspeakers, or on the wall behind the listening place or
just on the ceiling, always strictly symmetrically towards the sound sources
median axis, and... there is no need to install R1 on the lateral walls.
Warning !!!
In rooms almost or really of a cube shape
, the R1 must be mounted on the ceiling and one wall - behind the speakers [if
the loudspeakers are dipole or electrostatic , in order to support their back
sound radiation] and maybe a carpet will be required. The R1 is bringing
your musical source/s in harmony /consonance with the room's field - meaning
with a timbre with musicality, smoothing to inaudibility all nasty room
resonances. The number of R1 required for such a cubical shape rooms, depends on
their volume. A simple rule, is that the number representing the floor area in
square meters is the overall number of necessary R1, both for ceiling and one
wall treatment. For example if your room have a floor surface of 5 m x 5m = 25
m2, then less than 25 units R1 will be needed, 12 on one wall and 12 on the
ceiling.
In much smaller rooms, as the one used as speech cabin radio announcements, you
have to play with the wood supports orientation in order to calm down the
annoying resonances, the smaller the room the more perceptive are the room
resonances. In such a rooms if filled with absorption materials, the voices
becomes dull and blurred, the microphone is taking the stronger room resonances -
even fewer [a mix of low frequencies and subsonic harmonics], above the timber's
voice.
In such situations, with rooms built in the traditional way of using everywhere
absorptive materials, it will be wise to ask the newscaster if he or she,
without knowing enough well the text, will be able to understand his/her own
voice. Using the R1
in small patches upon all walls and part of ceiling, and a simple carpet on the floor, believe it or not, you
have the solution of voice clarity.
Time
to mount 9 or 12 R1's along with the wood drivers using simple home tools-about
one hour!
The
low frequencies are responsible for poor communication, difficult ensemble
playing, for increasing hearing loss in musicians and the harmful masking
phenomena. You surely know, the low frequencies excess's and the standing waves
problems are common in almost any room. In order to smooth them and calm you, we
successfully opted for a very large aperture complex Helmholtz resonator with
indeed minimum flow resistance using no porous material.
The
low frequency resonator and the full range clean sound diffuser is the one and
only sole full audio band device, working efficiently from about 5 Hz to the
high frequency limit of our hearing ability, the R1! Don't expect to play bad
recordings and hear absolute quality sound. The R1 will unveils your recording
problems along with your environment specifications.
Luxury built rooms let you with the same mediocre sound after few days of visual
admiration. You don't know precisely why you spent so much for your audio
installation and in your room the sound is not as expected. There is a lot of
people giving you free or expensive advices and you are still unhappy with your
sound.
All
this, for most professionals or a hobbyist must be already understood but it
isn't. Why? Because if just a few small details are forgotten something happens
and the sound is not good as expected.
Maybe all this that you are reading seems too much, or even unbelievable. The
whole idea behind a revolutionary invention like the R1 is just this, a big
challenge.
Don't
try to measure just one R1, but at least 9 units in a 3x3 matrix well mounted on
a hard and steady surface.
It works and must be measured grouped in at least 9 units matrix. The more
grouped R1 are you acoustically measuring (by yourself or in a qualified
acoustical laboratory), the more the standing waves are able to be smoothed by
the R1 and the diffused field characteristics are almost identical to the ideal
diffusion curves. Please note that, the more R1 are you measuring, the
reverberation time is perceived and measured as lowering accordingly, the
musicality of sound being the most acknowledged aspect.
As the
practice and theory said, If the sound source is positioned as away as possible
from the R1’s grouped surface, a much powerful, clean and containing all the
source information becomes the diffused sound field. Contrary to the other
materials which are used in a more architecturally / decoratively way rather
than with pure acoustical parameters in mind, try to imagine the aural result from a large Roundffusor1’s covered surface in a big hall…
More and the most important, the grouped R1 works - linearly and musically -from
the normal voice level [ 55-65 dB ] up to more than 130 dB SPL. There are no
other materials really active at such extreme levels and keeping the source
quality throughout...
Fortunately, we are in one of the rare situations when objective acoustical
measurements tends to approve the subjective / perceptive ones or vice
versa.
Using
R1, you
may perceive for yourselves that for the home cinema situation , all the frontal
source information are transmitted and spread naturally , like in real life,
towards the back of your room and the many satellite speakers for some, becomes
redundant. The research indicated statistically, a tendency for a very good
stereo plus central speakers situation instead of many and from time to time
wrong calibrated lateral speakers. As all things in life, statistic may be a
subjective matter.
The
clean R1's diffusion's result? It's like being immersed in the initial
recording room along with the electronically or naturally recorded reverberation
times. In the recording sessions, the R1's keeps the original timbre & dynamics
for all kind of instruments and voices. Aesthetically, what's better than the
original?
Here are the
R1's critical measurements,
showing that the R1's plastic body doesn't vibrate - so doesn't produce sensible
second generation sound /harmonics, and , that the air from the R1's back
Helmholtz resonator function is having a double role - adaptable for low and
very low frequencies, up to 181 Hz and beyond this, the mid and high frequencies
are drastically damped [ only from the R1's inside ] with about 10 to 25 dB ,
this explaining the dramatically perceived and measurable RT60'S reduction in
empty rooms containing only the R1.The front R1's surface , don't forget , is
producing the clean diffused field, enhancing the room's loudness field by a
factor of 1,5 -2. This is a paradox, and the superposition principle is called
to solve it.
There is absolutely no need to fill the R1 with porous materials. Who insists in
this , in fact doesn't understand the R1's functioning....
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The R1 is not a sound
insulation material !
By < sound
insulation > we understand to not disturb our neighbors or be
disturbed by them – this being ‘’performed’’ by putting between ‘’us’’ and
‘’them’’ enough ‘’concrete’’ distance, meaning one or more parallel solid
walls or much deeper ‘’patched’’ porous materials, but ''deep'' is anything
more than 1 - 2 meters
or more in order to attenuate AND
the low frequency disturbance.
Even technically educated people confuse interior room acoustics with
sound insulation. To be
precise, if you mismatch the porous ‘’sound insulation’’ with ‘’room
acoustics’’ the ‘’best’’ results will be an insufficient sound insulation
and a very bad quality room’s sound field – a muddy and without a clear
midrange and high frequency spectrum , I repeat – IN THE ROOM. |
Using the R1, a drastically
Reverberation Time
lowering is obtained ! And this not by absorption !!!
This means much better
intelligibility...
The
Roundffusor1 is the World's most efficient acoustical diffuser and self
adaptable low frequency absorber. Self adaptable means that our device filters,
from case to case, the undesirable room responses and lets your preferred music
sound as it was recorded
As
the R1 standard, the 9 or 12 or 15 grouped portable R1 must be positioned behind
the speakers or behind the listening place, always symmetrically towards the
source's median axis. The distance between the portable R1 kit to the back wall-
just few centimeters.
And
once again, don't forget that your beloved LP's, CD's and DVD's are made in a
recording studio or a music hall and your dedicated room for music must behave
similarly. More
and more recording studios are made having the Roundffusor1 as a basic , not to
say sole acoustical material. Why not imitate the professionals? What is a
really good sound is another story but usually, live acoustic instrumental &
vocal music, may be the reference. If your sound system cannot reproduce close
enough-at realistic levels or not, just one instrument as heard occasionally
played in the street, then you have a problem, usually an acoustical one. Once
you have had bought many sound systems or improved them continuously and you are
unhappy, then your room is not acoustically treated or is wrong treated and you
loose ''somewhere'' parts from your music...
The R1 may be used
in Hi-Fi, High-End rooms, home cinema, music schools, churches, recording and
rehearsal studios, TV studios, music halls and big multi channels sound
cinema halls.
The R1 is a hard
impact polystyrene made device. You mount it in your dedicated room for music,
just on one wall or ceiling and instantly, you obtain Perfect Acoustics.
Additionally, the R1 reduces the overall room's reverberation
time (RT) as would do a much bigger typical expensive absorptive surface
The
typical absorptive materials are any kind of porous materials or combination of
porous, fabrics and hard materials covered with fabrics, those materials producing absorption
in the mid and high frequencies, there , where the music's details should always
be heard.
Don't forget that all porous materials may be a problem for your health.
Are you aware about
this wrong and inertial situation ? It is a problem for you ?
The R1 reduces the
room's reverberation time [RT] and you will perceive the sound in your room as
if the room is filled with a lot of furniture, heavy curtains, etc. and in fact
being empty, with just a carpet on the floor or even without it - a thrilling
experience. This RT's attenuation offered by the R1- a smooth and musical
decay, is adaptively correlated with the sound contents- live or recorded and
the very specific room dimensions.
All this are the
R1's diffusion useful role, a smart alternative to the so tired and harmful
known typical absorption...
This idea about really clean diffusion's role, is a 70
years old one!
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The
low frequencies are responsible for poor communication, difficult ensemble
playing, for increasing hearing loss in musicians and the harmful masking
phenomena.
Using the R1 you don't
need any kind of the said ''bass traps'', because all the bass filtering is
made inside the R1's columns. Please see the
R1's critical
measurements. 
- the loudspeakers 
