VAC Signature Preamplifier Mk I - Manual (Page 6)

For power amplifiers with RCA input jacks, you will normally use the “RCA GND” setting. You
may also choose “XLR/RCA UNGND” if it is necessary to break a ground loop.
For power amplifiers with XLR input jacks, you must determine if the input is truly balanced,
or if either pin 2 or 3 is actually tied to ground (unbalanced XLR).
For true balanced inputs you may choose between “XLR GND” and “XLR/RCA UNGND” for
lowest hum level.
For power amplifiers with unbalanced XLR inputs, select “XLR/RCA UNGND”. If the amplifier
ties pin 3 to ground, you may also use “RCA GND”. Do NOT use “XLR GND”.
LOGO ILLUMINATION SWITCH (back panel)
The logo may be set for bright, dim, or no illumination. Since the logo light also functions as
the mute indicator, we suggest that it be left on.
OPERATION
Before turning the power switch to the “on” position, mute the unit by moving the “Mute”
switch to its clockwise (i.e., muted) position. You might also want to turn the “Volume”
control fully counterclockwise.
Mute is automatically engaged when switching on the unit. The mute state is indicated by
the VAC logo being illuminated in red. When un-muted, the logo will be blue. (Note: the
logo illumination may be set for bright, dim, or off via the rear panel switch.)
Allow the preamplifier to warm up for a minute before you un-mute the unit; failure to wait
can cause a transient to be sent through your power amplifier that might cause damage to
your loudspeakers.
As with all high fidelity products, the sound characteristic of the VAC changes somewhat
as it warms up. Best sound will be achieved after about 15 minutes of operation.
Any time that the VAC Renaissance Signature Preamplifier has not been used for a few
weeks the sound may be different. This is also normal for high resolution audio equipment.
Optimum sound should return after a few hours of operation, preferably with an audio
signal.