Niles Audio HDL-6 - Manual (Page 7)

Avoiding Interference
Speaker wires can act as an "antenna" for electrical noise. Locating
speaker wires too close to a light dimmer or switch may cause a
"buzzing" or "popping" sound to be heard through the speakers.
If you must locate the HDL-6 wiring near electrical devices, route
the speaker wires several feet away from the electrical wiring.
Using the HDL-6 with Tube-Type Amplifiers
Virtually all tube amplifiers must have a load connected at all
times. If the amplifier to be connected to the HDL-6 is a tube
amplifier, be sure to always have at least one pair of speakers
switched on at all times. An alternative is to permanently connect
a 150 ohm, 5 watt resistor across the tube amplifier's output in
parallel with the HDL-6. See (Figure 1) on next page for hookup
diagram.
6
H
I G H
D
E F I N I T I O N
S
P E A K E R
S
E L E C T I O N
S
Y S T E M