APB DynaSonics
10
© 2006 APB DynaSonics – All Rights Reserved
INPUTS
The following pages describe the input controls and connections of the Spectra-C and Spectra-T consoles.
When a section specifically applies to the C or T versions of the console it is indicated as such in the Heading.
MONO INPUT
Line Switch
Selects between the channel XLR connector (Up) or the TRS Line Jack (Down). On the rear panel, the TRS
jack’s normal contacts are fed from the XLR jack; this allows a line-level signal on an XLR plug to be patched
into the channel without the use of adaptors. If a plug is inserted in both the XLR and 1/4” connector, this
switch selects between the XLR signal and the TRS signal.
+48-Volt Phantom Power Switch With LED
When depressed, pr48-Volt phantom power to the XLR connector. Phantom power is required for
operation of many condenser microphones. See your microphone instructions to see if phantom power is
required or is to be defeated (some –though few- microphones require phantom power NOT be activated or
they may be damaged). A Red LED illuminates when this switch is activated.
Pad Switch
When depressed, inserts a 26dB pad into the XLR-input signal path prior to the microphone pre-amplifier to
prevent overload of excessively high input signal levels. Use this pad switch when you find that you are
operating the gain control in the lower third of the control range and still showing excessive signal levels
(yellow and red indications) on the channel meters.
Polarity Reverse Switch
When depressed, reverses the electrical input polarity of any microphone or line level input signal. Use of
this control may alter the sound quality of an input relative to other channels when multiple microphones
are picking up the same sound. In the past, many consoles labeled this function as “Phase” or used the
symbol “Ø.”
Input Gain Control
This control adjusts the amount of gain at the input stage and should be adjusted for the best signal
performance within the console. The goal is to achieve the best signal-to-noise while amplifying input
signals to workable levels, neither too high nor low. The channel’s six-segment meter is used for
visualization of proper (pre-fader) channel levels, while soloing the channel will give more detailed level
information. Proper level is achieved when there is continuous full green illuminated when input sources are
at their highest levels with rare flashes of the yellow and red LED’s.
Direct Output Pre Switch
This switch selects the signal source for the Direct Output from a post-fader to a pre-fader signal source. The
pre-fader source is determined by internal jumpers including: (factory default in
bold
)
1) Mic Pre Out
2) Insert Send (Post HPF)
3) Pre-Fader (After Insert and EQ)
High-Pass Filter On Switch With LED
When depressed, activates a variable frequency high pass filter (reducing levels of all frequencies below the
set frequency). When this switch is activated, an associated green LED will illuminate.
High-Pass Filter Control
Adjust the high-pass filter corner frequency between 20Hz and 400Hz at a roll off rate of 12dB per octave.
This control is used to remove unwanted signal content below the set frequency such as stage rumble. The
result is usually improved signal quality of the associated input signal while decreasing the low frequency
amplification demand of the audio systems amplifier and speaker combination. This type of filter is also
called a Low-Cut filter.
