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Each PoE supply device (IP switch or power injector) has a certain maximum
output power capacity. This can limit the number of PoE outputs that can be set
on. For a 4410A loudspeaker, calculate the output power for each output as 15.4
W for PoE and 30 W for PoE+. Ensure that the total power does not exceed the
switch or power injector total power.
Example: IP switch total power is 150 W. You use PoE+ and four outputs are
connected. The total output power is 4 x 30 W = 120 W. This is smaller than the
capacity of the IP switch, 150 W. This scenario is acceptable.
PoE cable loss calculation
There is power loss in the Ethernet cable. The reason for the power loss is that
the CAT cable conductor is thin and has considerable resistance. The power loss
increases with increasing cable length. The maximum cable length is 100 meters
(333 feet). Calculate the power loss in cable at 25 mW/m or 7,4 mW/ft. The
4410A will automatically adapt to the power loss in the cable, but lower input
power will slightly reduce the maximum SPL output. In order to minimize the
cable loss and to maximize the duration at maximum SPL for very long cable
runs, consider using power injectors close to the loudspeakers or short cable
runs.
ISS AUTOSTART
The automatic power function ISS (Intelligent Signal Sensing) powers the
loudspeaker automatically down when it is not in used and up when the use
resumes. ISS can be activated and adjusted with the Smart IP Manager
software. Powering down to standby happens after a set time when playback has
ended. Playback automatically resumes with an input signal exceeding the level
configured using the Smart IP Manager. There is a slight delay in the automatic
powering up. If this is undesirable, ISS can be disabled with Smart IP Manager.
The intended use of this loudspeaker requires that the IP network interface is
continuously enabled also in the standby mode. This enables the ISS to wake up
with an API command or in response to IP audio stream. The power consumption
in of a 4410A in standby mode is 3 W. To save more power, the PoE+ power
supply in the Ethernet switch or PoE injector can be turned off. However, the
loudspeaker wakeup when the PoE power is turned back on again will take a
longer time and the loudspeaker does not respond to any IP network commands
while it is not powered and until it has started.
SELECTION OF IP SWITCH
Smart IP and the 4410A are fully compatible with standard Ethernet and IP
switch technology. Genelec recommends using gigabit speed managed IP
switches with full PoE+ on each of the outputs intended for 4410A loudspeakers.