CAM-16 / CAS-16 User Manual v1.0
10
Connecting the CAS-16
Each CAS-16 is shipped with a multicore cable terminated
with 25-pin Dsub connectors, male-to-female. Plug the male
connector into the Expansion Link Output
14
on the rear
panel of the CAM-16, and the female connector into the
Expansion Link Input
15
on the rear of the CAS-16. Tighten
all the locking screws.
If the system needs more than one CAS-16 (i.e., more than
32 headphone stations are required), simply “daisy-chain” the
additional CAS-16(s) in the same manner, by connecting the
Expansion Link Output of one to the Expansion Link Input
of the next, using the multicore cables provided in each case.
EXPANSION LINK
TO SUB-STATION CAS-16
PUSH
Audio Distribution Sub-Station
CAS-16
Audio Distribution Sub-Station
CAS-16
TO FURTHER CAS-16s
CAM-16
CAS-16 #1
CAS-16 #2
Only the multicore cable supplied with each CAS-16 should
be used for interconnecting a CAM-16 and a CAS-16, or
two CAS-16s. Do not attempt to locate a CAS-16 remotely
from its CAM-16 base unit, or from other CAS-16s in the
system, by the use of a longer cable.
Outputs
Each of the CAS-16’s outputs is identical to the headphone
outputs on the CAM-16, and may be wired to headphone
stations in exactly the same way. See “Outputs 1 to 16” on
page 9, and also refer to the manuals supplied with the
RH-8 and WP-8 headphone stations.
Chassis Ground Terminal
The rear panel of the CAM-16 is fitted with an Earth (Ground)
binding post
11
. This is provided for protection purposes; the
CAM-16 will normally be connected to a number of different
consumer-type sources - TV sets, radio receivers, satellite
receivers, etc., and grounding the CAM-16 is a safety measure
to protect the users of the system. The terminal should be
connected to a convenient earth point in the rack’s mains
distribution system.
Appendix
EMC considerations
The CAM-16 Audio Distribution Matrix and CAS-16 Audio
Distribution Sub-Station fully conform to the relevant
electromagnetic compatibility (EMC) standards and are
technically well behaved. You should experience no problems
interfacing units to other items of equipment and under
normal circumstances, no special precautions need to
be taken. If the unit is to be used in close proximity to
potential sources of HF disturbance such as high power
communication transmitters, radar stations and the like, it is
suggested that input signal leads be kept as short as possible.
If the CAM-16 is mounted in a 19” rack, do not locate the
unit in close proximity to a powerful amplifier of any kind,
which may radiate a strong magnetic field from the power
transformer.
Earthing
When several mains powered units are connected together
via their signal cables, there is a risk of one or more earth
loops, which may cause an audible hum on the system
even with the gain controls set to minimum. The 0 V rail
of a CAM-16 is directly coupled to the chassis ground. No
interconnection problems should be encountered, but if
there is any hum or other extraneous noise when source
equipment is connected, the situation can generally be
remedied by observing the following guidelines:
• Always connect sources using balanced connections
wherever possible. Note that, for EMC reasons, the
cable screen should be connected at both ends.
• Use audio isolating transformers (readily available from
trade suppliers) at the inputs if necessary. These will
ensure that the amplifier is electrically isolated from the
source equipment.
• The signal source units should be located as close
as possible to the CAM-16 and the metal housing of
the various units should not be electrically connected
together through the equipment rack. If this is a
problem, rack isolating kits are available from specialist
hardware suppliers. If the problem persists, try to
connect all interconnected units, including power
amplifiers to a common power source to ensure a
common ground is provided.
