ISP Technologies SM 652 W/B - Manual (Page 6)

SPEAKER POWER:
The HDDS system distributes low voltage Alternating Current over the Cat5 cable plus
high level balanced audio and is capable of greater than 48 watts continuous output
power per SM652 speaker. Each of the Master Control Modules three outputs A, B and
C are capable of delivering up to 7 amps of output current. With a typical power per
speaker of 10 watts each speaker will average on the order of 400mA, which means
that 12 speakers would require 4,800mA of current. Installed systems that require
more output power per speaker simply require that the number of speakers per output
A, B and C be reduced so as not to exceed the maximum of 7 amps available. The
current consumption at full power (48 watt continuous) will require over 1.5 Amp of
power per speaker. In order to allow the full 48 watts of power, where higher output
levels are desirable, the number of speakers per A, B and C outputs on each zone
needs to be limited to a maximum of 4 speakers. Reducing to 20 watts of power per
speaker, a maximum of 8 speakers per output can be connected to each A, B and C
zone output. With longer runs of cable exceeding 300 feet the cable voltage drop will
start to become a design factor. The Cat5 cable will start to limit the total power
capability once you exceed 100 feet of cable. Where maximum power output is critical
it is recommended to use Cat6 cable since the gauge per wire is 22 vs 23 with Cat5.
This increase will reduce the voltage drop over longer runs.
Cat5 Connections
The figure below shows the connections for each output A, B and C of each zone output
on the Master Control Module and also connections between each SM652 speaker.
Connections are done via standard Cat5 cables where pins 1 through 8 are connected
common to the same pins 1 through 8 at each end. As shown below two wires in the
Cable are use for balanced audio and 6 wires are used for power with two providing
ground and two for each of two 22VAC power signals fed down the cable.
Mounting the SM652
Refer installation to a qualified installer to ensure proper mounting to overhead
structures. The SM652 includes a U bracket for easy install allowing the speaker to
swivel for proper alignment and aiming.