Specifications

Community R2-Series Installation/Operation Manual — Page 14
HIGH-PASS (LOW FREQUENCY) FILTER
The R2s use fully horn-loaded low frequency drivers. The specified low frequency response is 70 Hz. Any
attempt to reproduce significant levels below this frequency can result in over-excursion of the low frequency
drivers. For this reason an electronic high-pass filter set for 60 to 70 Hz must be used. The slope should be a
minimum of 12 dB per octave. This will protect the drivers from some of the extreme low frequency sounds found
on CDs and other program sources. It will also protect against unwanted low frequency energy that can come
from such things as microphone wind noise - an important consideration for outdoor applications.
Many power amplifier manufacturers offer plug-in high-pass filter input modules. This is an excellent method to
provide the necessary filter and to make it relatively tamperproof.
MPORTANT: Operating an R-Series loudspeaker without the recommended high pass filter will reduce
its low frequency power handling and may result in physical damage to the low-frequency devices.
EQUALIZATION
The R2s are designed with a high quality crossover that acoustically balances and matches the low, mid-range,
and high frequency drivers for optimum performance. However in some cases external equalization will be used
to "voice" the loudspeaker for particular applications or to attenuate feedback-prone frequencies. When
equalizing an R2 the following points should be kept in mind to achieve the best results and to avoid damaging
the drivers.
1. Use only small amounts of equalization. In particular do not boost frequencies by more than about 3 dB.
When cutting frequencies more than 3 dB of attenuation is OK. Bear in mind that extreme frequency cuts will
usually result in less than optimum performance.
2. Do not attempt to boost any frequencies below 70 Hz with a graphic equalizer. Note that with the
recommended high-pass filter, moderate amounts of boost from a simple bass control are acceptable.
SIGNAL PROCESSING