Configuration And Operation; Line Voltage; Input Selector Switch - Emotiva SA-250 User Manual

Configuration and Operation

Configuration and Operation

line Voltage

The SA-250 can operate from line voltages of 115 VAC +/- 10% or 230 VAC +/- 10%. Be sure to
select the correct line voltage for your area using the Input Voltage switch on the rear panel
of the SA-250.
Note: Connecting your sA-250 to a power source with the Input Voltage switch in the wrong
position may result in improper operation or damage to your sA-250.
AC power switch (rear panel)
The rear-panel AC Power switch controls the main AC power for your SA-250. When this switch is
in the Off position, the amplifier will not operate. Turning it On will put the SA-250 into Standby
mode.
standby switch (front panel push button)
Press to switch the amplifier On; press again to return to Standby; the Standby Indicator LED will
illuminate red for Standby mode and blue when the SA-250 is On.

Input selector switch

Use this switch to select between the balanced and unbalanced input for each channel of the
SA-250. The Input Selector switches for the Left and Right Channels of the SA-250 are mirror
imaged. Simply remember to set both switches TOWARD THE INPUT CONNECTOR THAT YOU ARE
USING on each channel. Also remember that, if you're using an unbalanced cable for your input,
but have it plugged into the 1/4" balanced input connector, you should set the Input Selector
Switch for that channel to balanced (because you're using the balanced input connector).
Gain selector switch
Set this switch to the value that provides the best match to your source equipment; for most
home audio equipment, this will be 29 dB. However, if your source equipment has an unusually
high output level, or you notice excessive background noise when no audio is present, the 23 dB
setting may provide better results.
Ground lift switch
When this switch is in the Ground position (the position with the circuit ground symbol), the input
circuit ground of the SA-250 is connected directly to chassis ground. When this switch is in the Lift
position, input ground is connected to chassis ground through a 10 ohm resistor. Normally this
switch is left in the Ground position; if you notice audible hum and suspect a ground loop as the
cause, setting one or both switches in the Ground Lift position may reduce it.
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