Emotiva SA-250 User Manual - Configuration and Operation

Page 15

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.