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Interfering reflections can be controlled by absorption or diffusion. In small rooms, it is often desirable to control interfering reflections and provide an ambient sound field using diffusion instead of absorption. When the room’s surfaces are relatively close to the listener, a very efficient diffusing surface is needed. To solve this problem, RPG® patented the Skyline®. It is the industry’s first — and most efficient — omnidirectional primitive root number theory two dimensional diffusor. The Skyline® scatters incident sound uniformly so that the acoustic glare in all directions is minimized. Problem Small rooms like Project Studios need a very efficient surface to diffuse interfering rear wall reflections and provide a diffuse sound field. Solution To solve this problem, RPG® utilized advanced primitive root number theory to design the most powerful and aesthetic two dimensional omnidirectional diffusing surface in the acoustical industry. Diffusion

The uniformity of diffusion is characterized by the standard deviation of the 1/3 octave polar response, for a given angle of incidence. For each of the 37 angles of incidence, 37 backscattering impulse response measurements are made at 5° increments between 0° and 180°. The Diffusion Coefficient is the mean standard deviation for all angles of incidence, normalized to the standard deviation of a delta function (1 equals ideal diffusion). The data illustrate the exceptional uniformity of diffusion above the diffraction limit (565 Hz = 1130 ft/sec/2'), which is related to the 2' dimension of the panel. The Diffusion Coefficient of a flat reflective panel is shown for comparison. Absorption The solid expanded polystyrene core of the Skyline® provides useful low frequency absorption. Installation The Skyline® is very easy to install on walls or ceilings using the supplied hook and loop fasteners.  Apply both sides of the hook and loop fastener to the rear of the Skyline® in each corner on a flat area. Remove the protective paper from the exposed side and apply to the wall.  For permanent mounting, construction adhesive must also be applied, where space allows on the back of the unit, along with the hook and loop fasteners. The Skyline® can also be inserted into a T-bar ceiling grid. WARNING: The Skyline® is fabricated from flame- retardant, high- density expanded polystyrene foam. It is the nature of this material to have rough surface imperfections and contain steam vent holes. Some of these imperfections can be partially concealed by a factory paint process. If you are interested in a painted product, RPG® offers a painted version in Duron Multispec Fine Fleck paint. RPG® does not recommend that the Skyline® be painted in the field and assumes no responsibility for any damage resulting from field painting.

Sound strikes a two dimensional diffusing

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 moulding 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.

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 moulding 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 FlutterFree®
Offers mid-high frequency diffusion, with the possibility of low frequency absorption using a Helmholtz mount

Slotted FlutterFree®
Offers mid-high frequency diffusion with accompanying absorption below the diffusion cut off. Additional low frequency absorption may be added using a Helmholtz mount
 
Features and Benefits
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  
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 

Problem

There are three aspects of conventional foam which can be optimized:

1. Conventional flat backed wedge and convoluted foams are applied directly to the mounting surface, where the particle velocity is zero. Since no absorption can occur when the particle velocity is zero, a significant portion of solid foam is wasted.

2. To provide appropriate absorption coefficients, conventional foam is sold in several thicknesses. If an application requires additional absorption at a later date, the existing foam must be removed and a panel of greater thickness applied.

3. Conventional foam has limited interior design application because of its "industrial" appearance and potential safety hazards.

Solution
To solve these problems, RPG® patented ProFoam™, the first nestable, Variable Depth Air Cavity (VDAC™) foam. ProFoam™ uses an innovative, attractive, and universal profile to space most of the foam away from the surface for optimum absorption. Since ProFoam™ is nestable, one size fits all applications.

Unlike conventional foam, additional absorption can be achieved at a later date by simply adding additional nestable layers to form a VDAC™ Stack. ProFoam’s™ unique attractive shape allows it to be used as a design element. When formed from fire safe Melaflex™, ProFoam™ can be used in all spaces that require Class A interior finish treatment.
Acoustical foam provides the most cost-effective approach to controlling interfering reflections and noise. To optimize the performance and appearance of conventional acoustical foam, RPG® patented an innovative profile design. This new nestable profile utilizes a Variable Depth Air Cavity (VDAC™) to strategically space most of the foam away from the mounting surface for optimum absorption efficiency and economy. By combining ProFoam™ and RPG®’s ProCorner™, a complete acoustical foam room treatment system is possible. The Studio In A Box Packages are now available.

Absorption


VDAC™ technology provides minimum point of contact with the mounting surface, thus enabling most of the foam to be positioned away from the wall for optimum absorption. Unlike conventional foams which are applied in a fixed thickness, additional absorption can be achieved by simply stacking new layers on top of the existing ProFoam™.

We now offer many different materials, all offer the same acoustic properties of the original Profoam but now offer greater fire retardancy ratings.
 
Polyflex™ ProFoam™ is fabricated from a UL94 2 lb./cu. ft. polyester urethane, which should only be used in Class B or C spaces. Since Polyflex™ is flammable, extreme care should be exercised in its use as an interior finish


Features
First nestable profile foam
First profile foam using patented VDAC™ technology
Available in Class A Melaflex™ and UL94 Polyflex™ (polyurethane)

Benefits
Seamlessly integrates with the ProCorner™ to provide a complementary acoustical system for interior design and sound control
One universal profile fits all applications
Begin economically and upgrade performance as needed
Nestable profile can be layered to any thickness offering unlimited absorption at any time
Can be applied in vertical and horizontal combinations
Can be cut into various width strips to fill required area
Melaflex™ ProFoam™ complies with all interior finish Class 0 fire safety codes
New modern look allows use as an interior design element

VDAC™ technology allows optimum performance at the lowest prices

Applications
Melaflex™ ProFoam™ is fabricated from non fibrous, fire resistant, open cell, lightweight (0.6 lb/cu. ft.) BASF melamine foam. It is in full compliance with all National Life Safety Codes for Class A interior use. Melaflex™ has a flame spread of 10 and a smoke development rating of 50 as per ASTM E-84 testing standards. Therefore, Melaflex™ ProFoam™ can be used in any critical listening space