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C O N T R O L F U N C T I O N S
A
SE LE CTOR S WIT CH
This knob is rotated to select a Line Level Input (M -
overleaf). Note that the Selector Switch is bypassed
when the Tape/EPL(External Processor Loop) mode is
selected by depressing the Tape/EPL-Source button (E).
B
BALANCE CONTROL
This knob controls the relative balance of the left and
right channels to compensate for any discrepancies
caused by speaker placement, source imbalance, etc.
Full rotation to the left or right of the center detent will
fully attenuate the left or right channels.
C
VOLUME CONT RO L
This knob allows variable control over the Pre 1L out-
put level. Turn it clockwise and the music gets louder!
D
HEADPHO NE INPUT JACK
The Headphone Jack accepts 1/4" stereo headphone
plugs. Upon insertion of the headphone plug, the main
preamp output is disabled. All other preamp functions
remain operational. Removal of the headphone plug
restores the main output signal.
E
TAPE/EPL (E XTE RNAL PROCESSOR L OO P)-
SOURCE BUTT ON
When this button is in the SOURCE position (button is
not depressed) the signal is routed through the
Selector Switch (A) to the Tape/EPL Output (L - over-
leaf) connected with a tape deck or external proces-
sor such as a surround sound decoder. Listening and
taping is done in this mode. When the button is
depressed the source signal is taken from a tape or
processor source through the Tape/EPL Inputs (N -
overleaf) bypassing the selector switch.
F
PREAMPLIFIE R LED
This Light Emitting Diode has three status conditions
identified by different displays. They are:
• DIM - indicates the Power Switch (I) has been ini-
tialized and that the Pre 1L is cycling through it's 45
second turn on sequence. During this turn on
sequence the output will be muted.
• BRIGHT (Normal) - indicates that the Power Switch
(I) is in the ON position (depressed) and that the
Mute Switch (H) is in the out position.
• FLASH (Normal Intensity)- indicates the Pre 1L is
muted; the Mute-Operate button (H) is depressed in
the Mute position.
G
MON O/S TE RE O BUTTON
When in the ON position (button depressed) the Mono
function is enabled. This function sums all selected
input signals together, and directs them to both chan-
nels. As long as the button is depressed a left or a
right mono signal will be sent to both channels of the
preamplifier. All other preamplifier functions will oper -
ate normally.
H
M U T E - O P E R ATE BUTT ON
When in the OPERATE position (not depressed), this
button will allow normal operation. When in the MUTE
position (button depressed), the audio signal is pre-
vented from reaching the Main Outputs (K - overleaf).
The LED (F) will flash as a reminder.
I
ON- OFF BUTT ON
When in the ON position (button depressed), all power
supplies within the preamplifier are initiated. A delay of
approximately 45 seconds is required for the power
supplies to stabilize. After the 45 second delay, the
muting relay will engage, and the preamplifier is opera-
tional. When in the OFF position (not depressed), the
Pre 1L is OFF.
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