VAC Signature Preamplifier Mk II - Manual (Page 6)

OUTPUTS & GROUNDING SWITCH (back panel)
One pair of RCA jacks provide line level output to a tape recorder. The level of signal is not
adjusted by the volume control.
Two sets of RCA output jacks are provided as main outputs to power amplifiers. In addition,
one pair of XLR jacks can be used to drive a power amplifier.
The GROUND switch must be set correctly for the output configuration being used.
Incorrect setting will result in either excessive buzz, or cause gross distortion of frequency
response and output.
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.