Front Panel Controls



Signal Path
The System 9098 DMA contains two high quality signal paths that can be used as a stereo pair or two individual paths. When used with a stereo mic setup, the central WIDTH and M-S controls enhance the manipulation of the stereo image.

Direct Injection
The DI (Direct Injection) switch changes input from the rear XLR to the front panel jack socket. In DI mode, the input impedance is greater than 100kOhms for use with guitars and synthesisers.


Gain Control
The DMA is capable of 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 produce an overload.


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.


A phantom power switch is fitted for use with capacitor mics and applies phantom power to the rear mic input XLR.

A phase invert button is fitted to easily correct any phase anomalies caused by difficult mic placement or mis-wired cables

The high pass filter attenuates signals below 120Hz@18dB/Octave.

Input M-S
The Input M-S matrix operates immediately after the input gain stage. If M-S (sum and difference) mic 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.


Output M-S

The Output M-S switch converts conventional L-R signals into M-S format. Used in conjunction with the Input M-S matrix, M-S encoded output signals can be generated no matter which input format is used, L-R or M-S.



When the DMA is used with stereo signals, the Width control can be used to modify the nature of the stereo image. When central, the normal image is unaffected. When fully clockwise both signals are merged together into mono and fed to both A and B outputs equally.
When fully anti-clockwise the stereo image appears much wider as the phase of the “difference” component is manipulated. In this position the A and B outputs remain a stereo pair. At points in between, the degree of image width can be selectively controlled.

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