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Operational Guide
Overview
The System 9098 Dual Mic Amplifier (DMA) contains two identical high quality signal paths
that can be used as a stereo pair or two individual paths as required. When used with a
stereo microphone or a "stereo" pair of microphones, the central WIDTH and M-S controls
enhance the functionality and manipulation of the stereo image.
Gain
The DMA is capable of high output levels in excess of +25dBu. The switched gain control
provides a range of 0-66dB in 6dB steps, so when using the minimum gain setting of 0dB
only the most extreme sources are likely to produce an overload.
Certain types of capacitor microphones are capable of producing output levels well in
excess of 0dBu when placed close to very loud sound sources, so care should be taken in
the selection and placement of microphones to obtain the best results.
Trim
The variable trim control has a range of +/-6dB allowing fine gain adjustment between the
6dB switched gain steps. It also allows the gain to be extended by 6dB at either end giving
an overall gain range of -6dB to +72dB.
DI
The DI switch changes the channel input from the rear XLR to the front panel jack socket.
In DI mode, the input impedance is greater than 100kOhm and suitable for use with guitars
and synthesisers, plus the gain control is restricted +30dB max.
48V
A phantom power switch is fitted for use with capacitor microphones and applies phantom
power to the rear panel mic input XLR only. The DI jacksocket is NOT affected.
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