Front Panel Controls - Grace Lunatec V3 Owner's Manual

Figure 1. V3 Front Panel

FRONT PANEL CONTROLS

GAIN CONTROL Each gain control has 11 positions and adjusts the voltage gain from 10dB to
60dB in 5dB steps.
TRIM CONTROL The trim control provides 10dB of continuously variable gain trim. In the fully
counter-clockwise position the trim is at unity. In the fully clockwise position the trim control adds
10dB of additional gain. The trim control can be used to adjust the record level smoothly during
recording.
PHANTOM POWER (labeled +48) This switch provides 48 Volts to power condenser
microphones. The phantom power switch connects the +48V power supply to pins 2 and 3 on
the XLR input connector. Alternatively, the V3 can be configured to provide 12V Parallel power.
Please contact the factory for information on this option.
HIGH PASS FILTER (labeled HPF) Sometimes referred to as a bass roll-off, the HPF uses
a three position toggle switch to select two different low cut corner frequencies and an OFF
position. Position 1 is the higher cutoff frequency and Position 2 is the lower cutoff frequency.
Internal jumpers allow for selection of either 6dB/octave (passive) or 12dB/octave (active) slope.
Also, internal jumpers select the cutoff frequencies at 50Hz/100Hz or 75Hz/125Hz. The 12dB/
octave filter employs a transitional Thompson-Butterworth response for the best combination of
pass-band flatness and time domain response. See jumper confuguration section for detailed
information.
POWER SWITCH (labeled 0-I) The power switch connects power from the DC input connector
to the preamplifier circuitry. If the preamplifier is connected to a charged battery or other DC
power supply, one of the sample rate LED's will illuminate.
LOW BATT For the 6 Volt V3, the low battery indicator flashes if the battery voltage drops below
5.75V. For the 12 Volt V3, the low battery indicator flashes if the battery drops below 11.5V.
ANSR™ SWITCH This switch activates the ANSR™ dither circuit which allows the V3 to output
16-bit data on its digital outputs. The amber ANSR™ LED will illuminate when this circuit is
active. Use the ANSR™ circuit when recording to 16-bit digital devices such as DAT and CD-R
recorders.
PEAK CLEAR SWITCH Pushing this switch clears the 0dBFS/OVER indicators.
SAMPLE RATE SELECT (labeled Fs SEL) Sample rates are selected by pushing and holding
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