Canton DM50 Operations Instructions download pdf (Page 17)

Problem Possible cause Solution

DM System hums. 1. Signal lines from source device to DM System

too long.

1. Use shorter signal line.

2. Signal line used is not fault-protected or the

protection has been damaged (defective).

2. Change signal line for a fault-protected line.

3. Ground loop (ripple pickup) generated. 3. A ground loop can be generated when two or more

devices connected via a signal line (cinch) are plugged

into separate sockets (e. g. ampliﬁer and computer). Plug

all devices connected to the DM System into a multiple

socket output using safety plugs.

4. Another piece of equipment on the same

circuit has no interference suppression

(e.g. fridge).

4. Switch off possible sources of interference to test; unplug

the device concerned to see if the humming noise disap-

pears or connect the source of interference to a different

circuit (L1, L2 or L3). (Where necessary take advice from

your electrician.) Insert a special “ferrite common mode

ﬁlter” (available from specialist retailers) between the

ampliﬁer and the DM System to eliminate the humming.

Turn the power plug round to reduce the so-called ripple

voltage (particularly important if the source device is not

earthed).

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Canton DM50 Operations Instructions Page 17