Specifications

2
FRONT PANEL FEATURES
(1) (2) (3) (4) (5) (6) (7)
(1) Mic Level: This rotary control adjusts the level of the Mic
Input signal sent to the Main Output and Zone Output sections.
Mic Input signal can be assigned to the Main and/or Zone Outputs
individually, plus it can be assigned to the Main Output as pre/post
Tone and pre/post Main Level (see Modifications on pgs. 4 & 5).
(2) Channel Select: These four momentary push-buttons select
which Stereo Line Input signal is sent to the Main Output and Zone
Output sections (see Stereo Input Assign on pg. 4). To select a
desired Stereo Line Input, press the corresponding push-button.
The adjacent LED indicator will light, indicating the selection. More
than one Stereo Line Input can be selected at a time by pressing
the corresponding front panel push-buttons simultaneously.
Whenever power to the SPM412e is turned off or interrupted,
Channel Select settings are retained in non-volatile memory for
recall when power is turned back on. However, default settings
can be defined and stored for recall at power-up (see Power
Switch below). NOTE: See Remote Control on page 6.
(3) Bass: This rotary control adjusts the low-frequency (Bass)
content of the Main Output signals. When this control is centered
(12 o’clock), Bass is normal (flat). When turned counter-clockwise,
Bass is decreased (-12dB @ 200Hz max.). When turned
clockwise, Bass is increased (+12dB @ 200Hz max.). A rear
panel switch allows the Bass & Treble controls to be bypassed
(see Tone on pg. 3).
(4) Treble: This rotary control adjusts the high-frequency (Treble)
content of the Main Output signals. When this control is centered
(12 o’clock), Treble is normal (flat). When turned counter-
clockwise, Treble is decreased (-12dB @ 5kHz max.). When
turned clockwise, Treble is increased (+12dB @ 5kHz max.). A
rear panel switch allows the Bass & Treble controls to be bypassed
(see Tone on pg. 3).
(5) Balance: This rotary control adjusts the stereo balance of the
Main Output signals. When this control is centered (12 o’clock),
left and right signal levels are equal. When turned counter-
clockwise, left signal level increases and right signal level
decreases. When turned clockwise, right signal level increases
and left signal level decreases. Use the Balance control to
compensate for uneven speaker coverage.
(6) Zone Level: This rotary control adjusts the overall level of
signals sent to the Zone Output (see Zone Output on pg. 3).
(7) Main Level: These three momentary push-buttons adjust the
overall level of signals sent to the Main Output (see Main Output
on pg. 3). The Down push-button decreases level and the Up
push-button increases level. As long as either push-button is
being pressed, signal level will continue to change until the
minimum or maximum level has been reached. It takes
approximately five seconds to adjust from one extreme to the
other. When the Mute push-button is pressed, the output is muted
(turned off). Pressing the Mute push-button again will gradually
un-mute the output. Pressing the Up push-button (while the output
is muted) will immediately un-mute the output and begin increasing
the level. However, Pressing the Down push-button (while the
output is muted) will cause there to be a decreased level when the
output is un-muted. Whenever power to the SPM412e is turned off
or interrupted, Main Level settings (except Mute) are retained in
non-volatile memory for recall when power is turned back on.
However, a default level setting can be defined and stored for
recall at power-up (see Power Switch below). The 9-segment LED
display indicates the relative level setting for the Main Output. The
display is not a signal level meter. The output has approximately
10dB of gain at ‘max’, 70dB of attenuation at ‘min’, and 0dB of gain
(unity) when seven of the nine LEDs are lit. When Main Output is
muted, only the ‘min’ LED will be lit. When Main Output is un-
muted, the display will return to the current level setting. Pressing
the Down button (while the output is muted) will cause there to be
a decreased level when the output is un-muted
, however, the
display will remain at ‘min’ until the output is actually un-muted.
NOTE: See Remote Control on page 6.
NOTE: Whenever power to the SPM412e is removed or
interrupted, Channel Select & Main Level settings (except Mute)
are retained in non-volatile memory for recall when power is
restored. Default Channel Select and Main Level settings can be
defined & stored for recall at power-up. To define & store default
settings: 1) Select the default Stereo Line Input(s). 2) Adjust
Main Level to the default setting. 3) Allow 3 seconds of inactivity
(settings are stored in non-volatile memory). 4) Turn unit off (un-
plug from AC power). 5) Press and hold the Mute push-button
while restoring power. 6) Release the Mute push-button. 7)
Cycle power off & on again (confirms the default power-up settings
are stored). These Channel Select & Main Level settings are now
stored in non-volatile memory, and will be recalled whenever
power to the SPM412e is turned off & on (interrupted). NOTE:
This process can be reversed (so the SPM412e will again recall
the most recent settings at power up) by repeating steps 4~7.