Oxygen 7Oxygen 7 - MONO MODULE
Pag. 17
7.4 INPUT STAGE
The A Input is via a standard female XLR-3 connector and it is set for
MICROPHONE sources. The input is electronically balanced and it is
factory-preset for a micro level.
The recessed GAIN A trimmer allows you to adjust the gain in a large
range. In conjunction with the GAIN potentiometer (see) this allows you to
adjust the overall gain to any desired figure within the available range.
The A PHANTOM jumper on the jumper bay (see § 7.7) applies phantom
powering +48V to the MIC input A socket for condenser microphones.
WARNING: The Phantom power is used to power micrphones with built-in
condenser or electrect preamplifiers. This system requires both
conductors to have the same D.C.potential. So, it’s indispensable that
cables and connectors are balanced and in perfect condition. If these
rules are observed, Phantom power can be applied even if microphones
without preamplifier built-in (e.g. dynamic microphones) are connected,
although it’s preferable to avoid doing so.
The B Input is via a standard female XLR-3 connector and it is set for
signals providing a signal LINE level such as tape machines, RadioMic
receivers, ISDN codecs.The input is electronically balanced and factory-
preset for a 0 dB level.
The recessed GAIN B trimmer allows you to adjust the gain in a large
range. In conjunction with the GAIN potentiometer (see) this allows you to
adjust the overall gain to any desired figure within the available range.
Only one of the two inputs (Input A or Input B) will be active at any time,
depending upon the setting of the B SEL switch (see)
Two unbalanced INSERT sockets (A and B) are provided which are a
break point in the input channel signal path. The insert point allows
external piece of equipment such as limiters, compressors and other
signal processing units to be added as required to particular input
channels.
The Insert are a 3-pole ¼” ‘A’ gauge Jack Socket, which are normally by-
passed. When a jack plug is inserted, the signal path is broken at a point
just after the preamplifier stage, but before the Input Selection (B SEL
key). The signal from the channel appears on the TIP of the plug and is
returned on the RING to continue through to the final output.
Using some external equipment, may be wise to place a resistor of 100
Ohm in series with the signal coming from the module and driving the
external load.
7.5 B SEL Switch
The B SEL switch selects the INPUT B (Line) socket when depressed and
the INPUT A (Mic) when released. A LED glows red when the INPUT B is
selected.
Both left and right signal paths are fed by the same mono input signal.
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