ISP Technologies HDDS Master Control Module - Manual (Page 8)

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 30 watts continuous power per
speaker. Each of the 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
consume on the order of 400mA, which means that 12 ceiling 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
(30 watt continuous) will require over 1 Amp of power per speaker. In order to allow
the full 30 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 limiting the maximum
number 5. 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 150 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 75 feet of cable.
Where maximum power output is critical a more precise calculation can be done by
following the speaker consumption guide.
Linking Zones
The picture below shows Zone1 linked to Zone 2, Zone 3 linked to Zone 4 and Zone 5
linked to Zone 6. This configuration will allow either mono or stereo control of a pair of
Zones. Each zone on the rear of the Master Control Module.
External Link IN / OUT
The Master Control Module provides external linking to additional Master Control
Modules by Cat5 connection via the Link In and Link Out connectors on the rear panel.
If more Zones are required in a system or more speakers in one large zone connection
from one Master Control Module to additional Master Modules is simply done by
connecting the Link output from the controlling unit to the Link in on another unit.
Pushing the zone 6 link button one the first Master Control Module will link Zone 6 of
the first Master to Zone 1 of the second Master Control Module. This will allow Zone 1
on the first Master Control Module to control all 12 Zone outputs if all link buttons are
pushed in linking on all Zones.