8
Input Expander
The optional expanding kit (WE-2) is necessary to increase
the number of input. Up to two inputs may be added by
loading the expanding kit in the user's space. For details, refer
to the instruction manual of the kit.
Note
When the temperature of heat sink exceeds 105°C, the protection circuit is activated and the output is
disconnected from the circuit. The signal automatically begins to be output as the temperature goes down. In
such a case, confirm whether or not unit is overloaded or operated on an excessive output.
5. SERVICING
Unpacking
Upon receipt of the amplifier shipment, please incurred for any damage incurred in transit. If damage is found,
please notify your local TOA representative and the transportation company immediately.
State date, nature of damage, whether any damage was noticed on the shipping container, prior to unpacking.
Please give waybill number of shipping order.
Failure
Should amplifier fail, contact your nearest TOA authorized contractor or service center.
6. OPERATING
When all connections are completed, turn power switch on.
Then, the power indicator is illuminated. Approx. 5 seconds after switching power on, the amplifier comes into
operation.
Adjustment of Volume
Adjust the individual input and master volume controls to obtain appropriate output level.
When the peak indicator remains lit, reduce the sound volume to turn it off. If the system is operated with the
peak indicator lighting, it downgrades sound quality.
Adjusting graphic equalizer
The one-octave graphic equalizer tailors sound system frequency response to room acoustics, reducing feed-
back tendencies and improving intelligibility. Characteristic of this equalizer is as per below graph. Adjust it to
obtain the desired frequency response by actually hearing the sound or by using pink noise.
To make the adjustment, place the EQ switch in the IN position.
If a control knob is moved toward the plus (+) direction, center frequency is boosted and if toward the minus
(–) direction, it is cut. Placing the EQ switch in the OUT position bypasses the equalizer circuit and makes
frequency response flat.
Filter
When the HIGH PASS FILTER switch is in the ON position, low frequency is cut. In this event, low frequency
below 180 Hz may be cut at a 12 dB/OCTAVE rate. When LOW PASS FILTER switch is in the ON position,
high frequency of 7 kHz or higher may be cut at a 12 dB/OCTAVE rate.
To bypass the filter, place the filter in the OFF position.
Expanding kit WE-2 Modules
Installation of optional items should be performed by a
qualified service personnel.