Owner`s manual

PAGE 18 Community R1 Series Owner’s Manual
application. Prior to installation, the contractor should present a rigging plan, with drawing and detailed parts
list, to a licensed structural engineer (P.E.) or architect for written approval.
9 OPERATING PRECAUTIONS
9.1 LIMITING
Although R1s have built-in PowerSense™ DDP circuitry to help prevent damage to the drivers from excessive
power, electronic limiting is strongly recommended. This is especially true if an R1 is installed in relatively
inaccessible locations or is being operated by personnel who are not trained operators. In such cases the limiter
should be used as a hard-line device to prevent amplifier clipping and preventing output voltages in excess of
40V RMS and 95V peak power. The following are recommended settings for this purpose. Set the limiter
threshold to actively limit the audio signal if the average rises above 40V. In no case should the limiting allow
amplifier clipping. If adjustments are available: set the attack time to a moderate time (10 msec is a good
starting point) and the release time to fast (1 msec is a good starting point). This will allow most peak (dynamic)
information to pass. The limiting ratio should be set to at least 10:1. Although this may compromise audio
quality when limiting, you are protecting the drivers at this point and therefore audio quality should be a
secondary consideration.
9.2 AMPLIFIERS WITH BUILT-IN LIMITING
Recently power amplifier manufacturers have introduced amplifiers with either built-in limiting or accessory
limiting modules. In both cases these limiters are usually designed to prevent the amplifier from clipping. This
type of limiting is acceptable to use in lieu of a stand-alone limiter because it is easy to set-up, is specifically
designed for the amplifier, and in most cases, is tamper-proof. This assumes that the amplifier output is sized as
recommended in CHAPTER 6.