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.
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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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
APPLICATIONS
- Conference and teleconference
rooms
- Public spaces
- Listening rooms
- Recording and broadcast
studios
- Post production studios
- Home theaters
- Distance learning centers
- Rehearsal rooms
- Auditoriums
- Performance spaces
SPECIFICATIONS
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Northampton, MA 01062 
