System overview
EST3 Installation and Service Manual 1.33
Audio applications
Amplifier selection
The EST3 system provides amplifiers with 20-, 40-, and 95-watt
output ratings to meet any project requirement. Selection of the
proper amplifiers requires an understanding of the amplifier
characteristics and application related information that follows.
Audio zoning
The output of each amplifier usually covers a single audio zone,
typically a floor of a high rise building. Using the appropriate
Signature modules, the amplifier’s output can be divided into
several zones. The output circuit can be configured for either
Class A or Class B wiring.
Output wattage
The output rating of an amplifier is determined by the speaker
load it is required to drive, and any expansion or safety factor
required. The speaker load is determined by adding up the value
of all the wattage taps selected on each speaker connected to the
amplifier. For a conservative approach, use the highest wattage
tap available on each speaker. This insures there is enough head
room to adjust speaker taps to compensate for any installation
variables such as sound absorbing furniture, etc.
Output voltage
Zoned amplifiers are available with either a 25 Vrms or 70 Vrms
output. The 25 Vrms output amplifiers are primarily used in
retrofit applications that previously had 25 Vrms speakers
installed. 70 Vrms output amplifiers are recommended for new
installations. The output circuits of a 70 Vrms amplifier can be
run eight-times farther than a 25 Vrms amplifier, given the same
load.
Note: If all the system wiring is required to be power limited,
you may use any 20-, 40-, or 95-watt amplifier with either a 25
Vrms or 70 Vrms output.
Wiring considerations
Refer to Appendix B of this manual for wire distance
calculations and other wiring considerations.
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