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RPG Diffusor Systems: Modex Broadband
The First Full Spectrum Metal Plate Absorber
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 Home Theaters and dedicated listening rooms often exhibit poor low frequency response with significant
emphasis at modal resonances. Porous surface absorption is ineffective at these modal frequencies, because
the air motion near walls and in corners is essentially zero, resulting in very low absorption efficiency. RPG
developed its Modex™ Plate to address these problems. However, in addition to low frequency modal control,
small rooms require mid and high frequency reflection control as well. We are extremely proud to introduce a
new and unique addition to the Modex™ line, called the Modex™ Broadband, which complements the
Modex™ Plate. The Modex™ Broadband was developed by the Institute for Building Pyhsics at the Fraunhofer
Institute, and consists of a metal plate, embedded between two layers of damping material, surrounded by a
perforated metal frame. The Modex™ Broadband offers broadband absorption effective from 50 - 5000 Hz in
a thickness of only 4 inches. The Modex™ Broadband has an attractive powder coated metal finish and can
be surface mounted on walls or ceiling. Every now and then a new technology comes along that changes
everything. You will be astounded at the transients and clarity of sound once the Modex™ Broadband removes
all of the masking low frequency reverberance. Now you can absorb more bass in less space!
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Problem
Small rooms like Home Theaters and dedicated listening rooms
often suffer from low frequency modal problems and also require
mid to high frequency reflection control.Absorption at all of
these frequencies has not been possible with a single acoustical
surface treatment.
Solution
The Modex™ Broadband solves these problems by offering
significant absorption between 50 and 5000 Hz in a surface
depth of only 4 inches. The Modex™ Broadband represents a
new generation of acoustic bass management.Now you can
absorb more bass in less space!
Installation
 The Modex™ Broadband is installed by attaching metal “L” brackets to the boundary surface and sliding the panel
and screwingn to brackets. Panels should be installed at high pressure locations.In order of highest to lowest efficiency,
this would be the intersection of three boundary surfaces,two boundary surfaces and on one boundary surface |
| Specifications |
Absorption
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Surface or corner applied porous materials lose efficiency at
low frequencies,because the particle velocity or air movement
associated with these long wavelengths is low. The Modex™
Broadband consists of a freely moving steel plate 1 x 1.5 m
sandwiched between porous layers . Both react together in a
mass-spring manner offering absorption via three mechanisms.
First,the metal plate provides pistonic absorption down
to 63 Hz by vibrating against the “spring” of the porous backing.
Second,the bending modes of the free-moving plate are
heavily damped by the proprietary adhesive coupling with the
porous backing up to about 125 Hz. Lastly,mid-frequency
sound waves diffract around the plate’s edges to be propagated
and thus dissipated in the deep passive porous absorber layer.
Together,these mechanisms offer the industry’s first truly efficient,
broad bandwidth low frequency absorber with a shallow
profile of only 4 inches.
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Low Frequency Testing
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Many published low frequency absorption coefficients are non-sense, becasue the accuracy of the absorption efficiency
decreases at low frequencies in standard ISO 354 and ASTM 423 tests, due to inadequate diffusion. Therefore, additional
testing has been carried out at the Fraunhofer Institute in large scale impedance tubes with a cross section of 1.6 x 1.2 m
and a special approach monitoring the decay times of the lowest axial modes in a 5x4x3 m room, with and without the
sample present on one of the opposing surfaces. |
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| Product Details & Options |
Features
- Three mechanisms of low frequency
absorption
- 50 - 5000 Hz absorption efficiency
- High full spectrum absorption efficiency
- Thin profile
• Decorative perforated metal facing
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Benefits
- The patented Modex™ Broadband 30/1/70
damped metal system offers absorption via
pistonic vibration, damped bending modes
and porous absorption from the rear and front
polyester
- The three absorption mechanisms offer
absorption over a significant range of
frequencies providing modal control with one
product
- Absorption efficiency is high thus requiring
fewer panels for effective modal control
- The thin 4” profile allows the Modex Plate to be
used on exposed walls and behind T-bar and
stretch fabric systems
- The perforated powder coated metal enclosure
provides an attractive finish
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Application
All critical listening rooms, including recording
studios, broadcast studios, vocal booths,home
theaters, dedicated listening rooms, quality
control rooms, CD mastering, film mix and
dubbing stages and music practice rooms |
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Specifications |
- Size:
1 m (3’ 3”) x 1.5 m (4’ 11”) x 100 mm (4”)
- Model Number: 30/1/70
• Weight: 90 Lbs
- Finish:White Powder Coating
- Pre-drilled “L”- shaped, metal mounting
brackets supplied for easy installation.
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| Pricing |
Order Code |
Panel Size |
Color/Finish |
Units/box |
Lbs. |
Sq. Ft |
Price |
MDXB0WHP151S1
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60" x 40" x 4" |
White |
1 |
90lbs./unit |
16 |
$899.00 |
| For custom finish/color, add order code of MDXB2XXX151S1, and price of $1,125.00 |
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Northampton, MA 01062 
