14
Operational Guide
Meter
An eight segment lightmeter is fitted to indicate output level. Although the top segment is
marked O/L it indicates peak signal level activity, not necessarily overload conditions. The
threshold is factory preset to +22dBu but alternative levels can be set via internal jumpers.
Filter
The high pass filter attenuates signals below 120Hz @ 18dB/Octave.
Mute
The mute switch cuts the DMA output but does not affect the meter signal.
Image
The image section operates on the A and B channels to provide alternative input and output
formats together with variable image width.
Input M-S
The Input M-S matrix operates immediately after the input gain stage. If M-S (sum and
difference) microphone signals are connected to the inputs, the DMA can be used to
amplify them directly before sending them on to the mixer or tape recorder.
If any DMA signal processing is required (e.g. high pass filter or image width controls) then
the Input M-S switch must be used to convert the signals to conventional L-R format first.
When M-S signals are required to be sent on, the Output M-S matrix can be used to
convert the post-processed signals back into M-S format again.
Phase
A phase invert button is fitted to easily correct any phase anomalies caused by difficult
microphone placement or mis-wired cables.
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