2

English –

GAIN CONTROL

Input Gain

The gain control knobs 1–4, located on the front panel, adjust

the gain for both microphone and auxiliary-level inputs of chan-

nels 1–4 (see Figure 1). For example, the channel 1 gain control

is used for both the channel 1 microphone input (MIC LEVEL IN-

PUT 1) and the channel 1 auxiliary level input (AUX LEVEL IN-

PUT 1). The auxiliary gain control knob (AUX IN) affects only the

auxiliary input (AUX IN).

Output Gain

The master output gain control knob (MASTER) adjusts gain

to both the XLR balanced output (MIC/LINE LEVEL) and the aux-

iliary level output (AUX LEVEL).

Channel 1

Auxiliary Channel

Master Output

Channel 2

Channel 3

Channel 4

GAIN CONTROL

Figure 1

OUTPUT LEVEL METER

The six LEDs on the front panel labeled OUTPUT LEVEL

METER illuminate to reflect the peak level of the mixed output sig-

nal from the SCM268 (in reference to balanced line output) in dBu

(0 dBu = 0.775 V).

Use the master gain control (MASTER) to adjust peak levels,

as indicated by the LEDs. The red LED illuminates when the out-

put is 2 dB below clipping.

GREEN—Nominal

RED—Clip

Peak Level

in dBu

PHANTOM POWER

When the phantom power switch on the back panel is on

(12V PHANTOM—ON), the SCM268 provides 12 V of phantom

power to each XLR microphone input. The switch is recessed to

prevent accidental engagement. Most

condenser microphones

require phantom power. Use it when connecting these types of

microphones to the SCM268.

NOTE: Phantom power does not affect the operation of balanced

dynamic microphones. With phantom power on, they can be con-

nected to the SCM268 in combination with condenser micro-

phones that do use it.

Phantom Power Switch

OFF

ON

OUTPUT LEVEL SWITCH

The output level switch on the back panel (MIC/LINE OUT)

sets the level of the balanced XLR output. When set to MIC, it re-

duces the output by about 50 dB. Set the switch so that the output

level matches the input level of the device to which you are con-

necting the SCM268. The switch is recessed to prevent acciden-

tal engagement.

NOTE: The output level switch does not affect the auxiliary output

(AUX OUT) level.

Output Level Switch

LINE

MIC