page 12 User guide MX-8
Their functions are indicated on the label. In order to realise the function on
the left, short the respective jumper.
•
High-pass filters for each of the 4 microphone/line inputs, 40 Hz/ 100
Hz. For the use of microphones, the jumpers should be set to 100 Hz.
This high-pass (low-cut) filter reduces low-frequency vibrations and
compensates for the so-called proximity effect (the booming sound often
associated with close pick-up).
•
Phantom power: +48 V. This function is very usful for e. g. condensor
microphones, as most of the latter require phantom power.
•
Selection whether microphone or line input
4.3.2
Automatic threshold reduction, transmission matrix
The following image shows the second group of jumpers: 6 jumpers for each
of the four channels. (The numbers 1 through 6 denote the six
potentiometers for each channel. Their functions will be described in section
4.3.3)
•
THD: low noise threshold, on/off. A noise gate, determining the response
sensitivity of the microphones, can be either enabled or disabled here.
(The threshold itself is adjusted with potentiometer no. 3, see section
4.3.3). Actually, this analog threshold is quite redundant, as this the
response sensitivity is controlled in a much more precise fashion by the
automatic processor.
•
Automatic threshold reduction by the processor when using multiple
microphones, on/off: In order to achieve a maximum gain-before
feedback and signal quality, only those microphones are activated that
receive an actual (intended) signal. In parallel, there is an automatic gain
adjustment as additional microphones are activated. This automatic can
be either enabled or disabled by this jumper.
