VU METER (0dB calibration screw)
Recessed screwdriver adjustment for setting
0dB on the VU meter. The VU meter indicates
the amount of gain reduction in dB.
To calibrate the VU meter: Power unit on and
allow 30 minutes before making this adjust-
ment so that components can warm up to
operating temperature. While there is no signal
present, adjust the trim pot so the needle on
the VU meter lines up with zero (“0”).
COMPRESSION RATIO
Sets the compression ratio. Continuously
variable from 1:1 to 20:1.
Note: With opto-compressors, the Threshold
and Compression Ratio are interactive and
are effected by one another.
COMPRESSOR
Switches the compressor in the signal path
with a sealed silver relay. (Hard-wire bypass)
VU METER
Analog VU meter indicates gain reduction.
The VU meter’s needle is speed sensitive for
measuring attack and release of the signal.
EQUALIZER
Switches the six-band passive graphic
equalizer in the signal path with a sealed
silver relay. This EQ is designed for subtle
sweetening and shaping. It is very simple and
easy to use. The frequency turnover, Q and
amplitude ranges have been carefully chosen
for each band to provide extremely smooth
musicality. Pushing the faders up from center
detent will boost and pushing the faders down
will cut.
OUTPUT
Continuously variable output control. This
controls the overall program level of the Vt-747sp.
The Vt-747sp is calibrated so that 0 on the
LED output meters accurately shows +4dBu.
ATTACK
Varies attack time of compressor from 2ms
(FAST) to 200ms (SLOW).
RELEASE
Varies release time of compressor from
100ms (FAST) to 5 seconds (SLOW).
LF SIDE-CHAIN THRESHOLD Hz
Sweep variable peak/dip frequency setting for
Side-Chain parameter. (60Hz to 1kHz)
SIDE-CHAIN
Activates the two-band parametric spectral
Side-Chain controls.
GR (Blue LED)
Fast-acting blue light indicates peak gain
reduction.
HF SIDE-CHAIN THRESHOLD Hz
Peak/dip variable sweep frequency side
chain parameter. (600Hz to 10kHz)
SC LISTEN
To monitor the signal going into through the Side
Chain before it is effected by the compressor.
MAKE-UP GAIN
Variable 0dB to +10dB control to add gain
after compressed signal. (Only acts when the
compressor switch is in.)
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Page 15
Avalon Vt-747sp Operation Manual
Operation and
Controls
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