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Audio Owner Manual
USING THE SCEPTER SERIES MIXER
THE INPUT CHANNEL
The input channel accepts a balanced or unbalanced input signal from a
microphone, direct box or a line level source such as the output of a synthesizer, or
external signal processing device such as a digital delay line, reverb, etc.
Phantom Power 1
The SCEPTER Series Mixers are factory wired for the +48 volt DC. phantom
powering of condenser microphones. When the master phantom power switch is on
and the individual channel phantom switch is on, +48 volts is present at XLR pins 2
and 3. Power supplies MPS8-R, MPS8-P, MPS9 and RPSl provide the necessary
voltage. The master phantom power pushbutton switch is located at the top of the
master section on the front panel. The individual channel phantom power on
switches are located on the rear panel above the MIC connectors and can be
activated with a pencil or similar object.
NOTE: When using phantom power it is important to avoid connecting an
UNBALANCED signal source to the MICROPHONE input without having
first switched off the phantom power to that channel.
Input Gain Control
The input gain control is used to vary the gain of the 'input preamp. Control
range is +2dB to +66dB for MIC and -2OdB to +44dB for LINE. These figures
include the effect of the PAD switch.
Line Switch
When depressed, this switch selects the Balanced Line Input (l/4" stereo
jack). as the source for the Channel. The Balanced Mic input (3 pin XLR) is
selected when the switch is in the UP position.
Input Pad Switch
On occasion, situations may arise where high level signal sources (a live kick
drum, or some drum machines and synths) overload the input channel, even though
the input gain control is set at minimum. Engaging the PAD switch reduces the
incoming mic or line signal by 16dB. Should the amount of attenuation prove to be
excessive, the input gain control can be raised to bring the signal level up to the
desired level. The PFL system can be very useful here, and should be employed to
set channel gain to the proper level.
17
Section 3
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