PROSPEC 1U –STEREO INPUT CHANNELS
(ProSpec-1U8S includes 8 Stereo Line Input Channels)
(ProSpec-1U4M4S includes 4 Stereo Line Input Channels)
Channel Preamps
Channel Mute Switch (Internally Illuminated when Muted)
When pressed, this latching switch will mute the outputs of the channel. The Mute does not affect the
channel’s PFL feed or channel metering. This switch illuminates RED when activated and allow for
“Cueing” up a channels source while monitors through headphones without feeding it to the output of
the mixer.
Polarity Reverse Switch (Illuminated when active)
When depressed, reverses the electrical input polarity of the left line level input signal in reference to the
right channel. Use of this control may alter the sound quality of an input channel if the recorded material
is of a reverse polarity to each other. (In the past, many consoles labeled this function as “Phase” or used
the Ø symbol).
High Pass Filter Switch (Illuminated when active)
Inserts a high pass filter at 75 Hz at a roll off rate of 18dB per octave for both sides (L & R) of the channel
path. This switch is used to remove unwanted signal content below 75Hz such as any rumble that may
be part of source material. This results in a clearer signal that reduces low frequency buildup in an audio
system, which is often perceived as a muddy signal.
Left-Right / Center Assignment Switch (Illuminated when assigned to Center)
Assigns the stereo input sign to either the L-R Mix bus (Default) through the Pan Control or when switch is
depressed, the sum of Left-Right to the Center Mix Bus. This assignment method prevents the signal from
being accidently fed to all mix buses.
Balance Control
This control blends the post-fader signal between any of the left-Right bus-pairs When at the center,
detented position, both sides are fed equal amounts of signal (each down by 3dB). This Balance control
has no effect on the Center mix bus.
Peak/Signal Present LED Level Monitor
Dual-color LED monitors the left-Right channel levels as a summed signal. In normal operation, varying
intensity of the green LED represents acceptable signal levels. Should levels approach clipping, the LED
will illuminate red. This should be an indication to the operator that the channel input level control
should be decreased until the red peak indicators are no longer activated. (Overall output levels can be
adjusted by raising the master output level position to offset any decrease in level caused by lowering the
input channel faders).
