Niles Audio HDL-4 - Manual (Page 14)

4. Turn on the amplifier or receiver and select a source, such
as the tuner or CD player.
5. Slowly turn up the amplifier or receiver volume and set it
to a comfortable (not maximum) listening level. Be careful
not to overdrive or "clip" your amplifier. If the sound
becomes muddy or distorted, you have reached the limit of
your amplifier's volume capability and should quickly reduce
the volume to avoid damaging your speakers.
6. To turn off one or more speaker pairs, simply press the cor-
responding ON/OFF button(s) on the HDL-4. Refer to the
Protection chart for the correct setting of the PROTECTION
button.
Constant Protection Switch
The HDL-4 is equipped with a manual override for the protec-
tion circuit that enables you to defeat the front panel protection
switch and maintain constant impedance protection. This will
safeguard your amplifier from being overdriven due to acciden-
tal or improper use by anyone unfamiliar with the equipment.
To engage this override, move the rear panel "CONSTANT
PROTECTION" switch to the "ON" position. Constant impedance
protection will be maintained until the switch is turned to "OFF".
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