To store a volume/balance setting, adjust the volume and bal-
ance to the desired level then press and hold the button corre-
sponding to that input until the LED window blanks (about 4 sec-
onds), then release. Once the level is saved in memory for each
given input, it will be recalled every time that input is selected
again. Levels saved in memory will not be affected by unplug-
ging the power from the unit.
N o t e : The volume default for all inputs is factory set at 30.0.
L -
Standby Button -
If AC power has been interrupted or
shut off, the unit will remain in PRE-STANDBY mode for 10
seconds, while it begins it’s turn on cycle again (Refer to
Powering On & Start-up Procedures, on page 9). After 10
seconds, the unit can be powered on by pressing the STAND
-
BY button. The preamplifier will remain in MUTE mode for 22
seconds and after that the selected default input will be set to
BAL 1, display brightness to maximum and the volume will be
set to the preset value for BAL 1. When the preamplifier is
turned on for the first time the volume will be set to 30.0.
In STANDBY mode, power is still supplied to the tube filaments,
but the high voltage power supplies for the audio circuitry are
not yet on.
M -
Power Switch -
In the “O N” position, this switch turns the
Power Supply (Line 2) or Preamplifier (Line 1) on. In the “O F F”
position, the Power Supply and Preamplifier are off.
Note: Be sure the Power Supply Umbilical Cord (Y) that is attached
to the Power Supply chassis is plugged into the Preamplifier
chassis and the AC power cord is plugged in at both ends
before the Power Switch (M) is turned on. Failure to do this
may cause damage to the Preamplifier.
N -
Detachable AC Power Cord Socket -
Plug the
Preamplifier or Power Supplies’ (whichever applies to your unit)
A C Power Cord into this socket (see Figure 12). The
L I N E
S e r i e s
Preamplifiers are factory set for the correct operating volt-
age for the area in which it is sold (see rear of preamp or
power supply for voltage setting). If a different operating volt-
age is required, please contact an authorized Sonic Frontiers
dealer, distributor or the factory directly.
O -
Relay Trigger -
A normally “open” contact is supplied for
the control of an external device. This contact “closes” only
when OPERATE mode is selected (see figure 14 for more
d e t a i l s ) .
P -
XLR Balanced Outputs (Sets 1&2) -
These outputs are
balanced and should be used when connecting outputs to
another balanced unit such as one of the Sonic Frontiers
P O W E R S e r i e s
amplifiers. These two outputs, as with the sin-
gle-ended outputs (Q), allow for easier biamping and greater
flexibility when dealing with components such as electronic
crossovers, etc. As with all outputs and inputs on these
Preamplifiers, the left channel is situated on the upper row of
connectors and the right channel is on the lower row.
Q -
Single Ended RCA Outputs (Sets 1&2) -
These unbal-
anced outputs (single-ended) should be used when connecting
the outputs to another single-ended unit. These two outputs, as
with the XLR outputs (P), allow for easier biamping and greater
system flexibility.
R -
RCA Single-Ended Tape Output -
These actively
buffered outputs connect to a tape deck with single-ended
inputs. Only the balanced and single-ended inputs are avail-
able for the Tape output.
S -
RCA Single-Ended Tape Input -
This input accepts a
single-ended input connection from a tape source.
T -
RCA SSP Input -
This input accepts the left and right
channel outputs from your Surround Sound Processor (SSP),
completely bypassing all functions of your preamp.
U -
RCA Single Ended Inputs (Sets 1-4) -
These inputs
accept single-ended input connections from sources such as a
CD player, Tuner, Phono Stage, etc.
V -
XLR Balanced Inputs (Sets 1&2) -
These inputs accept
any balanced input connections from a balanced source. This
will achieve the highest possible sonic performance.
W -
I.R. Jack -
This jack can be used to plug in an external Infra
Red Repeater (see figure 13 for more details).
X -
Power Supply Input Socket (Line 2 and Line 3
only) -
Plug the Power Supply Umbilical Cord from the
Power Supply into this socket. Simply rotate the plug until you
feel a connection being made with the socket.The plug will
then insert easily into the socket when pushing the connection
together. Screw on the locking ring allowing it to “click” to
secure the connection (see figure 11)
N o t e : Do not attempt to unscrew the Power Supply Umbilical Cord from the Power Supply.
Y -
Power Supply Umbilical Cord (Line 2 & Line 3
only) -
This Umbilical Cord exits the Power Supply to plug into
the Power Supply Input Socket (X) (see Figure 8 for connection).
N o t e : Do not attempt to unscrew the Power Supply Umbilical Cord from the Power Supply.
Z -
Power Supply LED (Line 2 and Line 3 only) -
T h i s
green LED lights when the Power Supply is plugged in and
switched on.
A A -
Power Button (Line 3 Only) -
This button serves the
same purpose as the Power Switch (M) on the Line 1 and Line
2. In the “on” position (
I N
), the Power Supply is on. In the “off”
position (
O U T
), the Power Supply and Preamplifier are off.
C ONNECTION S A ND CONT ROL F UNC TIONS
C O N T ’ D
