8
(3) POWER LED –
This blue LED illuminates when AC power is connected and the rear panel POWER
switch is in the ON position.
(4) SIGNAL LED –
This is a tri-color LED that indicates the signal level at the input stage. The LED
glows GREEN with signal peaks, AMBER when the signal approaches clipping, and RED when the
signal is clipping (distorting). To eliminate clipping (for a cleaner sound), reduce the GAIN amount
and/or the incoming signal level.
(5) INPUT Switch –
This switch specifies the active input. It selects between either the rear panel MIC
input or the front panel DI (Direct Input). Note: The MIC and DI inputs cannot be active simultaneously.
(6) LO-Z/HI-Z Switch –
This switch changes the impedance of the
MIC and DI inputs. The available values are dependent on the input
type (MIC or DI), as shown in the table at right.
With DI inputs, LO-Z is typically used for instruments with high output and/or active electronics, while
HI-Z is typically used for instruments with low output and/or passive electronics. For more information
about impedance matching, see page 13.
(7) +48 V PHANTOM POWER Switch –
This toggle switch a48 volts to the MIC INPUT when the
switch in the up position. Most modern condenser and ribbon microphones r48 volts of
phantom power to operate. For more information, see page 14.
(8) LO CUT Switch –
The LO CUT switch activates the low frequency roll-off (high-pass) filter. When in
the FLAT position (down), all frequencies are amplified equally for full-spectrum sound. When in the LO
CUT position (up), frequencies below 100 Hz are attenuated. This is typically used to eliminate rumble
and other unwanted low frequencies from an incoming signal. For more information, see page 14.
(9) POLARITY (“ø”) Switch –
Determines the polarity of the OUTPUT. When IN ø is selected (down
position), the signal polarity is normal, and pin 2 is hot (positive). When OUT ø is selected (up
position), the signal polarity is inverted, and pin 3 is hot (positive). Polarity inversion is typically used
to reduce phase cancellation issues between microphones when more than one mic is used to record a
source. In normal use this switch should be off. For more information, see page 14.
(10) DI Jack –
The DI (Direct Input) is a ¼” mono “TS” (tip-sleeve) jack for connecting an instrument
such as electric guitar, electric bass, electronic keyboard, or other unbalanced signal sources. The DI
impedance can be set to 50K ohms or 2.2M ohms with the LO-Z/HI-Z switch. Note: The INPUT switch
must be in the DI position to use the Direct Input jack.
INPUT:
MIC
DI
LO-Z:
450 ohms
50K ohms
HI-Z:
1.6K ohms 2.2M ohms
Keep phantom power off (switch down) when it is not required.
To avoid loud transients, always make sure phantom power is off when connecting or
disconnecting microphones.
Always check the power requirements of your microphone with the manufacturer before
applying phantom power
.
Phantom power may damage select microphones.
