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Problem
Possible cause
Solution
AudioMaster Bt
hums.
1. signal lines from source device to
AudioMaster Bt 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 de-
vices connected via a signal line (cinch) are plugged into
separate sockets (e. g. amplifier and computer). Plug all
devices connected to the AudioMaster Bt 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 am-
plifier and the AudioMaster Bt 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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