SPL Frontliner Modular Recording Channel - Manual (Page 14)

14
Frontliner
Voltage Selector
The rear panel VOLTAGE SELECTOR sets the local line voltage (115 V position: 110-120
volts/6o Hz, 230 V position: 220-240 volts/50 Hz). The diagram shows the correct switch posi-
tion for 230 V power supply.
BEFORE you connect electrical power make sure that the VOLTAGE SELECTOR
setting reflects the correct local power line voltage!
Power switch
The rear panel POWER switch activates the unit, confirmed by the illuminated VU meter.
Switch on the unit only after you have checked the correct setting of the rear
VOLTAGE SELECTOR and 48V phantom power supply front and rear switches.
When you activate the Frontliner, the unit commences the warm-up mode to heat the tubes.
The warm-up cycle takes between 45 seconds (if the unit was active shortly before) and
approximately one minute at cold start. During warm-up the MUTE switch flashes. The MAIN
OUTPUTS and the output to the optional converter card are muted, all EXTERNAL INPUTS keys
are deactivated. The MUTE switch stops flashing when warm-up is finished. The MUTE switch
does not illuminate if it was not depressed before. It illuminates permanently after warm-up
when it was activated before.
Phantom power supply/rear panel switches
48 Volt phantom power is only needed for microphones requiring external current
(generally condenser microphones). Other microphones can be damaged if they
are used with activated phantom power, which may damage the Frontliner, too.
Please read the notes on using phantom power and how to activate it under “48 V” on page
15 and “Activating Phantom Power” on page 16.
Since phantom power is critical to operational safety, the Frontliner offers additional switches
on the rear panel to exclude accidental use of the 48 V switch on the front.
If both rear panel switches are not engaged, you can activate and deactivate phantom power
with the 48 V switch on the front.
The switch to the right labelled 48 V ON activates phantom power independently from the
front panel switch setting – now phantom power can no longer be switched off with the front
panel switch.
The left rear panel switch labelled DISABLE 48 V ON FRONT deactivates the 48 V switch on the
front, now phantom power can no longer be activated accidentally with the front panel switch.
The 48 V switch on the front is always illuminated if phantom power is active.
GND Lift
The rear panel GND LIFT switch eliminates hum by separating the internal ground from the
unit’s housing ground. Hum can, for example, result when this unit’s housing has a common
ground connection with other devices that might have a different ground potential. The switch
is usually deactivated to retain the shielding of the housing.
Switches
Rear Panel
POWER
POW ER
0
230V ~50Hz
Fuse: 315 m A slow
115V ~60Hz
Fuse: 630 m A slow
VO LTA GE | F US E
VOLTAGE | FUSE
GND LIFT
GND LIFT
GND
GN D LIF T
DISABLE
48V ON
FRONT
48V
ON