A-
Selector Switch
- This knob is turned to select an Input (P)
through (S). The Selector Switch is bypassed when the SFL-1 is in
the Direct mode as selected by the Direct/Normal Switch (B).
B -
Direct/Normal Switch
- When in the D I R E C T position, this
toggle switch selects the Direct Input (O) from a preferred
source, allowing the source signal to bypass all unnecessary
control functions. The signal is only affected by the Mute (G),
the Volume Control (H), and the gain stage of the SFL-1. When
in the N O R M A L position, all regular functions are in use and
the source is chosen through use of the Selector Switch (A).
C -
Tape/Source Switch
- When in the SO U R C E position, this
toggle switch routes the signal from the Inputs (P) through (S) -
as selected by the Selector Switch (A) - to the Tape Outputs (M).
Recording is only possible when the toggle is in the SOURCE
position. In the TAPE position, only the Tape Input jacks (N) are
operational, and the tape is then handled as a selected source.
D-
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. The
Balance Control is bypassed when the SFL-1 is in the Direct
mode as selected by the Direct/Normal Switch (B).
E -
Power Indicator LED
- This LED lights when the Preamplifier
is receiving power from an AC source. It will flash at one sec-
ond intervals during warmup delay and muting. After a 45
second warmup delay, the LED glows steadily green, the relay
circuit is no longer muted, and the preamplifier is ready for
o p e r a t i o n .
F -
Mono/Stereo Switch
- When in the MO N O position, this
switch combines the left and right signals to produce a mono
signal, which is useful for system troubleshooting when prob-
lems are suspected. When in the STEREO position, normal left
and right channel signals are processed.
G -
Mute/Operate Switch
- When in the M U T E position, this
toggle switch cuts off the signal to the SFL-1 Outputs (L), muting
the system (the LED (E) flashes as a reminder). When in the
O P E R A T E mode, the Outputs (L) are electrically connected,
allowing the signal to be passed to the next component (i.e.
a power amplifier or electronic crossover).
H -
Volume Control
- This knob allows variable control over the
SFL-1 output level. Turn it clockwise to increase the volume.
I -
Power Switch
- When in the ON position, this switch
allows the SFL-1 to receive power, rendering the SFL-1 opera-
tional, as indicated by the Power Indicator LED (E). When in
the OFF position, the SFL-1 is not receiving power and is not
o p e r a t i o n a l .
OPERATION, CONNECTIONS AND CONTROL FUNCTIONS
A
B
C
D
F
G
H
I
E
