Sirus ELXA Series, User Manual

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5. Operation
5.1. Connecting Power
ELXA Series amplifier power requirements are rated at:
a)
„idle“
b) 1/8th power
(„typical“ music conditions)
c) 1/3rd power (
„continuous“ music conditions)
d) Maximum rated power (circuit breaker limited)
The maximum power current draw rating is limited only by the front panel circuit breaker.
Consult the specification in the Appendices section for figures on the current that each amplifier will
demand. Make sure the mains voltage is correct and is the same as that printed on the rear of the
amplifier. Damage caused by connecting the amplifier to improper AC voltage is not covered by any
warranty. Unless otherwise specified when ordered ELXA amplifiers are configured as 230V/ 50Hz.
Note: Always turn off and disconnect the amplifier from mains voltage before making audio
connections. Also, as an extra precaution, have the attenuators turned down during power-up.
5.2. Cooling System
ELXA Series amplifiers use a twin-tunnel forced air cooling system to maintain a low, even operating
temperature. Drawn in by dual 45 cubic feet-per-minute (CFM) fans on the rear panel, air flows the
cooling fans of the channel heat sinks (dissipating power transistor heat), then exhausts through the
front panel slots.
The “intelligent” variable-speed DC fans are controlled by heat sink temperature-
sensing circuits. When the amplifier is turned on, the fans briefly “rev up”, then slow to an idle; this
indicates that the temperature sensing circuits are operating normally. The fan speed increases only
as required by heat sink temperatures, keeping fan noise to a minimum.
If either heat sink surpasses the maximum allowed temperature, the sensing circuit will open the
output relay, disconnecting the load from that channel. If the power transformer overheats, another
sensing circuit opens both channel output relays until the transformer cools to a safe temperature.
Important!
To ensure optimum cooling, periodically clean the amplifier fan filters (removable without tools). Also
make certain that there is enough space around the front of the amplifier to allow the cooling air to
escape. If the amplifier is rack mounted, do not use doors or covers on the front of the rack. If the
amplifiers are to be used in racks with closed backs, allow at least one (1) standard rack space of
opening in the front of the rack for every four amplifiers.
5.3. Connecting Inputs
Use either the XLR or ¼“ input connectors on the rear to supply audio signals to your ELXA Series
amplifier. Both connectors accept balanced and unbalanced audio connections. (The ELXA Series
amplifiers are configured standard wi
th „Pin 2 hot“ on XLR inputs. Please note that some other