Teufel ROCKSTER AIR Technical Description And User Manual page 30

No sound Volume of the source
via cable device has been set to
(LINE, AUX). zero.
A hum is The ROCKSTER AIR is
emitted connected to a differ-
from the ent power circuit from
speaker. the rest of the system.
The hum is due to line
disturbance.
The humming is
caused by a multiple
socket strip.
30 • ROCKSTER AIR
Carefully increase the volume on the
source device.
Connect the ROCKSTER AIR and the source
device/preamplifier to the same power
circuit.
Buy a line filter and connect all devices
to it.
Use a different multiple socket strip or
connect the ROCKSTER AIR directly to the
wall socket.