the
radia
series
the
radia
series
© Copyright 2003 Bohlender-Graebener Corp. All rights reserved. Products, features and specifications subject to change without notice.
Section
5
Installation
Installing the Radia Series planar speaker
As with all acoustic suspension speakers, maximizing the performance of an in-wall or in-cabinet speaker
installation requires complete dissipation of the rear wave into a properly prepared back enclosure. Improperly
designed enclosures will prevent the speakers from reaching their intended 60 Hz crossover frequency and will
result in non-flat response curves.
•
First, plan a speaker cavity of at least 51 square inches in cross-section (width times depth). The
height of the cavity must be at least equal to the length of the speaker. A good rule of thumb is to
use an enclosure no smaller than the standard 2x4 stud cavity on 16” centers. Prepare any
cabinet installation with at least this enclosure size in mind - for example, an enclosure for an 77”
tall system (such as the R75 or R50) would need to have a volume of at least 51x77 = 3,927 cubic
inches (2.3 cubic feet). Larger enclosures can be used with no detrimental effects, but smaller
enclosures will limit low frequency performance. Sealing holes and joints whenever possible will
also enhance low frequency performance.
•
Second, always fill the entire enclosure with slightly compressed fibrous tangle as would be found
normally in a speaker enclosure (Fiberglas insulation, Dacron, Miraflex, wool, etc.). Avoid hard
acoustic panels.
•
Third, wherever possible, prepare for the installation by first installing a shear surface beneath the
drywall. R-series speakers are relatively heavy and are capable of emitting high sound pressure levels.
A
1
⁄
4
or
3
⁄
8
inch plywood sub surface with a speaker cutout will also enhance the system’s performance.
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Cross-sectional view
