Cloud DCM-1 User's Guide download pdf (Page 20)

DCM-1 User Manual v1.0

Installation

Additional balanced sources

If it is necessary to connect more than one balanced

source to the DCM-1, one of the unbalanced inputs 1 to

7 may be used, but the advantages of balanced connection

will be lost unless a balancing transformer is connected

between the source and the unbalanced input. Suitable

audio transformers, which should have a ratio of 1:1, are

readily available from major audio component suppliers. The

transformer(s) should be mounted as close to the DCM-1 as

practical, and housed in a screened enclosure if they are not

individually screened. The preferred connection method is

shown below.

If transformers are not available, a balanced source may

feed an unbalanced input directly as long as care is taken

over how the connections are made. A variety of design

techniques are in use to implement balanced outputs in

audio equipment, and some designs require different wiring

protocols to others. Installers are advised to check the

manuals with each item for guidance on how the outputs

should be connected to an unbalanced input.

However, the wiring methods shown below will work in a

large number of cases. If hum or other distortion is found to

result, try disconnecting the ‘cold’ leg of the balanced output

(pin 3 on XLRs).

Always avoid using pre-made leads of an unnecessary length.

An alternative method of providing additional balanced

sources is to use BE-1 remote input plates connected to

EXTENSION PORTS 1 to 4; these could be installed

adjacent to the DCM-1 in such a situation.

LEFT

SCN

Unbalanced

inputs

SCN

LEFT

SCN

Audio balancing transformers

RIGHT

SCN

Unbalanced

inputs

SCN

RIGHT

SCN

pin 1 ground

pin 2 hot

pin 3 cold

Balanced outputs (XLRs):

1 2

Balanced source to unbalanced inputs via transformers

Unbalanced

inputs

LEFT

RIGHT

SCN

When using twin-and-screen

cable, join ‘cold’ to screen at

DCM-1 end

LEFT RIGHT

pin 1 ground

pin 2 hot

pin 3 cold

Balanced outputs (XLRs):

Balanced source to unbalanced input - using twin-and-screen cable

Unbalanced

inputs

LEFT

RIGHT

SCN

When using single-core cable,

join ‘cold’ to screen at the

source

LEFT RIGHT

pin 1 ground

pin 2 hot

pin 3 cold

Balanced outputs (XLRs):

Balanced source to unbalanced input - using single-core cable

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 67 68

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Cloud DCM-1 User's Guide Page 20

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