Niles Audio SPEAKER SPS-4 - Manual (Page 13)

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 SPS-4's front panel is a button
labeled PROTECTION. This button activates the SPS-4's imped-
ance correction circuitry. The circuitry assures that your receiv-
er or amplifier will see a safe operating load when playing mul-
tiple 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 over-
all system impedance might fall below 4 ohms. Use the follow-
ing 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
The Protection button should be:
OFF
ON
OFF
ON
ON
Set the Protection button to the correct position using the chart shown above.
12
S
P E A K E R
S
E L E C T I O N
S
Y S T E M
"TECH TIP"
You will need to
activate the SPS-4's
PROTECTION button
whenever the overall
system impedance
might fall below
4 ohms.