6
1. Power switch [
ON /
OFF]
Turning this switch on causes the amplifier to
function, and turning it off causes the amplifier to
cease function.
Note:
The unit is not completely disconnected
from the power supply even if this Power
switch is turned off.
2. Power indicator [POWER]
Lights blue when the Power switch (1) is turned
on.
3. Input level controls [CH 1 (BRIDGE), CH 2]
Adjust the input level of each channel.
Turn the control clockwise to increase the input
level and counterclockwise to decrease the level.
4. Ventilation panel (Air Vent)
A filter is located inside the ventilation panel.
To clean the filter, remove the ventilation panel.
(See p. 12; Cleaning the Filter.)
5. Indicators [INPUT, OUTPUT, PEAK, PROTECT]
The indicators are as follows from left to right:
• Input indicator [INPUT]
Lights green regardless of the input level control
setting when an input signal level exceeds about
–20 dB.
• Output indicator [OUTPUT]
Lights yellow when an output level exceeds
about 1 W at an 8
Ω
load (DA-250D) or 40
Ω
load (DA-250DH).
• Peak indicator [PEAK]
Lights red when an output signal clips (distortion
occurs).
Note
When the Peak indicator lights, turn the input
level control (3) counterclockwise until its light
extinguishes or decrease the input signal level of
the connected external device.
Operating the unit while the Peak indicator
remains lit may cause the protection circuitry to
be activated.
• Protection indicator [PROTECT]
Lights red when the protection circuitry is
activated. (See p. 11; Protection Operation List.)
When the power is switched on, this indicator
lights for about 2 seconds and then extinguishes.
When a bridge connection is made
(DA-250D only)
When Channels 1 and 2 are bridge-connected
(BRIDGE ON/OFF switch (9) is set to ON), the
CH 1/BRIDGE level control adjusts the input
levels of Channels 1 and 2.
In this event, the CH 2 level control cannot be
used.
1
2
4
3
5
1
2
4
3
5
DA-250D
DA-250DH
6. NOMENCLATURE AND FUNCTIONS
[Front]
