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12
H
IGH
D
EFINITION
S
PEAKER
S
ELECTION
S
YSTEM
Playing Two or M ore Speaker Pairs Simultaneously
1. M ake sure the amplifier or receiver power is OFF and set
the volum e 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
im pedance correction circuitry. The circuitry assures that
your receiver or amplifier will see a safe operating load when
playing m ultiple speaker pairs simultaneously. Since most
receivers and am plifiers 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.
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.
"TECH TIP"
You will need to
activate the HDL- 4's
PROTECTION button
whenever the overall
system impedance
might fall below
4 ohms.
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
The Protection button should be:
OFF
ON
OFF
ON
ON
Set the PROTECTION button to the correct position using the chart shown above.
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