Acustica Applicata Polifemo Variable Resonator
The Polifemo is a Helmholtz resonator is a device designed to control acoustic resonances.
It consists of a volume of air enclosed in a cavity, coupled with the outside through one or more openings, this creates a mechanical mass-spring system within its own resonance frequency at which the system is able to absorb a considerable part of energy.
The absorption of this kind of resonator is very selective about the frequency of resonance and particularly effective in the case of low-frequency booms.
However, a resonator doesn’t work on absorption only, the principle of the resonator has already been used in the past, to increase the voice volume of actors in open-air theatres or to amplify the sound of string instruments like guitars, violins and so on.
This resonator concept has a newly found application in the standard home listening room.
Category Acoustic Treatment
Country Italy
Manufacturer Acustica Applicata
The Polifemo is a Helmholtz resonator is a device designed to control acoustic resonances.
It consists of a volume of air enclosed in a cavity, coupled with the outside through one or more openings, this creates a mechanical mass-spring system within its own resonance frequency at which the system is able to absorb a considerable part of energy.
The absorption of this kind of resonator is very selective about the frequency of resonance and particularly effective in the case of low-frequency booms.
However, a resonator doesn’t work on absorption only, the principle of the resonator has already been used in the past, to increase the voice volume of actors in open-air theatres or to amplify the sound of string instruments like guitars, violins and so on.
This resonator concept has a newly found application in the standard home listening room.
Category Acoustic Treatment
Country Italy
Manufacturer Acustica Applicata
The Polifemo is a Helmholtz resonator is a device designed to control acoustic resonances.
It consists of a volume of air enclosed in a cavity, coupled with the outside through one or more openings, this creates a mechanical mass-spring system within its own resonance frequency at which the system is able to absorb a considerable part of energy.
The absorption of this kind of resonator is very selective about the frequency of resonance and particularly effective in the case of low-frequency booms.
However, a resonator doesn’t work on absorption only, the principle of the resonator has already been used in the past, to increase the voice volume of actors in open-air theatres or to amplify the sound of string instruments like guitars, violins and so on.
This resonator concept has a newly found application in the standard home listening room.
Category Acoustic Treatment
Country Italy
Manufacturer Acustica Applicata
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Acustica Applicata Polifemo Resonator
To develop an effective resonant device that treats the acoustic problems for a specific environment, it was necessary to produce a design that is really effective in dealing with the critical low frequency of that environment without affecting any of the others.
The resonator works in a narrow band and NOT on a broad-band, such as the DAADs work.
A resonator is fixed and dedicated only to a specific environment. It has to be very well calculated and matched between the environment and speakers. This is important if you don’t want to cause an acoustic disaster.
Despite the potential of the device, up to now, it has been very difficult to utilise in the home.
Polifemo is the modern answer to the principle of Helmholtz.
Polifemo can be adapted to each specific acoustic problem within the listening environment.
By some exclusive and effective technical solutions, it changes its resonance frequency to match that required in a certain environment. Its possibilities are almost limitless.
Starting from 26Hz up to about 60Hz, Polifemo gives you the opportunity to work on any frequencies in a clean and well-defined way. Changing the environment or replacing the speakers, Polifemo can be adjusted for any system or room design.
Polifemo is a cylindrical shape. At the base, which is appropriately elevated from the ground, there is a port that can be gradually opened or closed by a rotating plexiglass disk, this sets the correct frequency resonance in the specific environment.
Polifemo exalts the performances of an Helmoltz resonator by exhibiting two further exclusive regulations. The first is the “Eye” of Polifemo, a sophisticated iris diaphragm, whose aperture can be gradually and finely changed; the second is the internal paddle membrane that changes the speed of the internal air flow.
Since it can be considered as a “passive speaker”, the orientation of the “Eye”, which is obtained by rotating the entire device, influences the distribution of the sound into the listening room.
All the Polifemo adjustments can be performed by electronic measuring devices and/or by simply listening with your ears, the results are striking.
In addition to the precise control and articulation of the lower frequencies, the result is the Polifemo gives a clear enlargement to the soundstage, this is due to better resolution and an improvement of how the medium and high frequencies “float” over the bottom end of the frequency range.
When the system is properly tuned, Polifemo will transform any system. Greater dynamics with increased realism and a huge gain in micro-information are just some of the benefits.
In a listening room of standard size, one or two devices are necessary. These can be tuned in different ways to asymmetrically correct the soundstage and to solve various problems.
In some cases, to obtain the best results, 3 or 4 can be used. Generally, the suggested positions are along the walls or, in specific cases, in the corners.
Polifemo can be used with other acoustic treatment systems such as the DaaD’s.
