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Buyer
Beware!
Absorptive
fabric wrapped panels are the traditional treatment for flutter echoes which
are caused by repetitive reflections between hard parallel walls. While
absorption reduces flutter echoes, it also produces an acoustically "dead"
space. The resulting lack of ambiance makes the room seem psychoacoustically
smaller and reduces the support of acoustic speech levels which makes conversation
difficult.
FlutterFree® is a handsome, furniture grade, acoustical hardwood molding
that provides flutter echo control as well as bass absorption. Its application
converts small rooms with flat parallel surfaces into functional spaces
with good speech intelligibility, sound quality, and a natural, comfortable
ambiance. It expands the designer's flutter control finish treatment options
beyond fabric upholstered surfaces.
Non-slotted FlutterFreeŽ offers mid-high frequency diffusion, with the possibility
of low frequency absorption using a Helmholtz mount
Slotted FlutterFreeŽ (Patent Pending) offers mid-high frequency diffusion
with accompanying absorption below the diffusion
cutoff. Additional low frequency absorption may be added using a Helmholtz
mount.
Problem
Repetitive reflections from hard parallel surfaces produce flutter echoes
that are perceived as timbre coloration and degrade sound quality and speech
intelligibility. Absorptive surfaces are often used to control this annoying
problem, with the unfortunate side effect of making the room too "dead".
Solution
FlutterFree® is the first acoustical hardwood molding that controls
flutter echo by diffusion, maintaining the natural ambiance of the room.
When adjacent panels are spaced and mounted with an air cavity, low frequency
absorption can also be achieved.
Absorption
When
FlutterFree® panels are mounted 1/16" apart, the graph can be used
to determine the spacing from the mounting wall for the desired absorption
frequency. For example, to achieve bass absorption at 100 Hz, follow the
vertical 100 Hz frequency line until it intersects the leftward sloping
fractional open area line. Follow the horizontal line to the 8" intersection
point.
Diffusion
The
graph illustrates how FlutterFree® provides useful diffusion above
the diffraction limit of roughly 3400 Hz compared to a flat reflective surface.
The chart represents the mean diffusion coefficient, which is the normalized
standard deviation of the 1/3 octave polar responses for angles of incidence
between 0° and 90°.
Installation
FlutterFree® is molded on a 5 head wood molder from hardwood that is
kiln dried to 6-8% moisture content. RPG® takes every precaution
to minimize warping by stress relieving the rear surface and treating all
exposed surfaces on prefinished orders. FlutterFree® can either be
nailed or glued directly to a wall surface or
mounted with a rear air cavity for low frequency absorption. In
this Helmholtz mounting, a semi rigid fiberglass panel is mounted 1/4"
behind the FlutterFree®. To standardize and maintain the proper spacing,
lamello biscuits are included. When used as wall panels, a hardwood frame
not supplied is suggested.
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Home:
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FlutterFree®
The First Acoustical Hardwood Molding From The Industrys Leading
Innovator
| Features
& Benefits |
Features
Furniture grade, hardwood, sound diffusing acoustical molding
Low frequency absorption mounting option
FlutterFree® works on the 1D QRD® reflection phase
grating principle
Modular extruded diffusive strips
Benefits
Handsome furniture grade hardwood finish offers specifiers a
new approach to flutter echo control that does not rely on the
use of fabric upholstered fiberglass panels
Offers an almost unlimited variety of lacquered, stained, or
painted finishes and hardwood options
Diffusive flutter control minimizes flutter echoes without making
the space acoustically ®dead
Diffusive flutter control provides an ambient environment to
support speech in conference rooms for less fatigue, greater
coverage, and high speech intelligibility
Mounting FlutterFree® over an air cavity provides low frequency
absorption to minimize boominess and lack of definition in small
rooms |
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