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H
D
I G H
E F I N I T I O N
Playing Two or More Speaker Pairs Simultaneously
1. Make sure the amplifier or receiver power is OFF and set
the volume to minimum.
2. On the right side of the HDL-4's front panel is a button
labeled PROTECTION. This button activates the HDL-4's
impedance correction circuitry. The circuitry assures that
your receiver or amplifier will see a safe operating load when
playing multiple speaker pairs simultaneously. Since most
receivers and amplifiers are not rated for use below a 4 ohm
load, you will need to activate the PROTECTION button
whenever the overall system impedance might fall below 4
ohms. Use the following chart as a guide for setting the
PROTECTION button.
When playing the following speakers:
1 or 2 pair of 8-ohm speakers
3 or 4 pairs of 8-ohm speakers
1 pair of 4-ohm speakers
2, 3, or 4 pairs of 4-ohm speakers
Any combination of 4 and 8 ohm speakers
Set the PROTECTION button to the correct position using the chart shown above.
3. Locate the ON/OFF buttons on the HDL-4 which corre-
spond to the speaker pairs you wish to play. Set them to the
ON position.
S
S
P E A K E R
E L E C T I O N
The Protection button should be:
S
Y S T E M
"TECH TIP"
You will need to
activate the HDL-4's
PROTECTION button
whenever the overall
system impedance
might fall below
4 ohms.
OFF
ON
OFF
ON
ON
12
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