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R.5-MAX, R2-MAX, R6-MAX
Installation and Operation Manual
USE A DIGITAL SIGNAL PROCESSOR
For best performance, loudspeaker protection and system
longevity, a digital signal processor (DSP ) must be used
with all R SERIES loudspeakers.
Community's dSPEC226
processor(s) and Resyn® software contain all of the
information (high pass filters, limiters, factory tunings)
and DSP settings to fully optimize your system. For more
information on installing and operating your R SERIES
loudspeaker, please refer to Community’s website at
communitypro.com, or contact our Technical Applications
Group (TAG) at [email protected], or by phone
at 610-876-3400 or toll-free (within the US and Canada) at
800-523-4934.
SIGNAL PROCESSING
HIGH AND LOW PASS FILTERS
The R-MAX models use fully horn-loaded low frequency
drivers. Refer to the dsp settings files or product spec
sheets on the Community website for the recommended
high and low pass filter values. Attempts to reproduce
significant levels below these frequencies can result in
over-excursion of the low frequency drivers due to the
uncoupling of the low frequency horn.
The appropriate electronic high-pass filter with a minimum
slope of 12 dB per octave must be employed. Its usage will
protect the drivers from much of the extreme low frequency
content found on media sources. The high-pass filter will
also protect against unwanted low frequency energy that
can originate from microphone wind noise - an important
consideration for outdoor applications.
IMPORTANT
: Operating the R6 loudspeakers without
the recommended high-pass filter will reduce its
low frequency power handling, and may result in
physical damage to the low-frequency drivers.
EQUALIZATION
Equalization is the icing on the cake for sound systems.
And like the use of icing, it should not be overdone. Small
amounts of frequency boost can brighten-up the higher
frequencies and round out the lower frequencies, but they
should be restricted to no more than approxi3 dB
in order to avoid damage to the drivers.
Equalization cuts can be very effective for removing the
effects of room resonance and other unwanted acoustical
artifacts, but here again should be kept to a minimum.
Extreme EQ cuts (or attenuation) will not cause driver
damage, but should be used with discretion to avoid
acoustic ‘holes’ in the audible spectrum.
External equalization can be used to "voice" the loudspeaker
for particular applications and is especially effective in
attenuating feedback-prone frequencies.
CAUTION
: Do not attempt to boost frequencies at, or
below 40 Hz with an equalizer (either graphic or
parametric). This will counteract the effect of the
high-pass filter discussed previously, potentially
causing damage to the drivers.
POWER AMPLIFICATION
Power amplifiers for the R-MAX models should be
capable of providing enough power to properly drive the
loudspeaker without the amplifiers entering into a state of
clipping.
Clipping occurs when an amplifier runs out of power. The
peaks of the reproduced waveform begin to ‘clip’ and
resemble a square wave instead of the typical sine waves
and saw-tooth waves that form the basis of most speech
and music. Clipping leads to rapid driver failure because the
driver is no longer moving as it’s designed to. When power
is flowing into a driver, but movement is limited because of
amplifier clipping, much of the energy is converted to heat
which will soon cause the driver’s voice coil to burn out.
POWER RATING
Refer to the model specification sheets for the
recommended amplifier for each model. It is better to
oversize the amplifier to avoid clipping, than to undersize
it. Power amplifiers should exhibit good sonic properties
while providing high reliability to keep the system
functioning properly.
