Toa DA-250FH CU - Manual (Page 16)

16
10. INPUT SENSITIVITY AND HIGH-PASS FILTER ON/OFF SETTINGS
The Input sensitivity can be set to +4 dB (factory-preset) or –10 dB for each channel.
Besides, only the DA-250FH employs the High-pass filter on each channel, which can be set to "ON" or "OFF."
Step 1. Remove this unit's power plug from an AC outlet.
Step 2. Unscrew 8 screws securing the top cover of the unit, then detach it.
Step 3. Change the jumper socket position to "+4 dB" or "–10 dB" for the Input sensitivity as illustrated below.
When a bridge connection is made;
Set the input sensitivity with the CH1 jumper socket when Channels 1 and 2 are bridge-connected.
Similarly, set the input sensitivity with the CH3 jumper socket when Channels 3 and 4 are bridge-
connected. (Input sensitivity settings for the CH2 and CH4 are disabled.)
Step 4. Change the jumper socket position to "ON" or "OFF" for the High-pass filter as illustrated above.
(DA-250FH only)
ON position: High-pass filter ON (–12 dB/oct, cut off frequency 50 Hz)
OFF position: High-pass filter OFF
Step 5. Replace the detached top cover.
Viewed from top with the
top cover detached.
[When set to +4 dB]
(Factory-preset) [When set to –10 dB]
-
10 dB/+4 dB
-
10 dB/+4 dB
Input Sensitivity Input Sensitivity
Input sensitivity setting
Jumper socket Jumper socket
Front panel
CH1 CH2 CH3 CH4
3
2
High-pass filter setting (DA-250FH only)
ON/OFF Hi Pass Filter Jumper socket Jumper socket ON/OFF Hi Pass Filter
[When set to OFF]
(Factory-preset) [When set to ON]
With the High-pass filter jumper socket kept to the OFF position (factory preset), operating the
unit for long periods of time while the Peak indicator is illuminated due to excessive input signal
may damage the connected speakers, possibly resulting in fire.
Operating the unit with the High-pass filter jumper socket set to the ON position may decrease
the possibility of speaker damage or fire due to excessive input signal.
CAUTION
These servicing instructions are for use by qualified personnel only. To avoid electric shock, do not
perform any servicing other than that contained in the operating instructions unless you are qualified to
do so. Refer all servicing to qualified service personnel.
CAUTION
When a bridge connection is made;
Perform the same setting for the channels to be used (Channels 1 and 2, or Channels 3 and 4).
Operating the unit with the different setting may cause unit failure.