TOA Electronics F-1300B - Manual (Page 5)

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5. IMPEDANCE CHANGE
(F-1300BT, F-1300BTWP, F-1300WT, and F-1300WTWP only)
To change the impedance, use a standard screwdriver to rotate the rotary switch on the speaker's rear to
select the desired input power.
Note: The switch is factory-preset to 330 Ω.
6. ABOUT THE INPUT OVERLOAD PROTECTION CIRCUITRY
(F-1300B and F-1300W only)
The speaker system features internal input overload protection circuitry for both high and low frequencies.
If an excessive input level is fed to the unit, the protection circuitry automatically cuts off the signal to the
speaker driver.
A drastic reduction in sound volume for the high or low frequency range indicates that the protection circuitry
has been enabled.
In such cases, simply reduce the amplifier volume. The protection circuitry will automatically reset in
approximately 10 seconds. After reset, maintain the volume at a level slightly lower than before.
Note
This protection circuitry does not completely protect the unit against input overload. Depending on the type or
duration of excessive power input, the protection circuitry might not be enabled, resulting in damage to the
speaker driver. Also, if the excessive power input continues for a long period of time, the circuitry may not be
capable of resetting to its original condition.
Take care so that the speakers are not exposed to excessive power input.
Never set this switch to the "170 Ω" position when operating the speaker on 100 V line.
Failure to follow this instruction could result in damage to the speaker or amplifier.
CAUTION