Optimod-AM 9400 V1.2 Operating Manual - Orban

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3-40 OPERATION ORBAN MODEL 9400 Although it is located in the Multiband Full Modify screen (to make it easy for a preset developer to switch meter modes), this control is not part of the active preset and its setting is not saved in User Presets, unlike the other controls in the Full Modify screens. The meter mode always reverts to MASTER when the user leaves Full Modify. Because it only affects the front panel display, this control is not available in PC Remote. Advanced AGC Controls The following AGC controls are available only in the 9400 PC Remote software. AGC Maximum Delta Gain Reduction determines the maximum gain difference permitted between the two channels of the AGC. Set it to “0” for perfect stereo coupling. This control works the same regardless of whether the AGC operates in left/right or sum/difference MATRIX modes. In both cases, it controls the maximum gain difference between the “channels.” Depending on the MATRIX mode setting, the “channels” will handle left and right signals or will handle sum and difference signals. When the AGC operates in sum/difference MATRIX mode, this control determines the maximum amount of width change in the stereo soundfield. AGC Window Size determines the size of the “target zone” window in the AGC. If the input level falls within this target zone, the AGC release time is set to the number specified by the AGC WINDOW RELEASE control. This is usually much slower than the normal AGC release, and essentially freezes the AGC gain. This prevents the AGC from building up density in material whose level is already well controlled. If the level goes outside the window, then the AGC switches to the release rate specified by AGC MASTER RELEASE, so the AGC can still correct large gain variations quickly. The normal setting for the AGC WINDOW SIZE is 3dB. AGC Window Release (see AGC WINDOW SIZE above.) AGC Matrix allows you to operate the AGC in left/right mode or in sum/difference mode. Because the envelope modulation in CQUAM AM stereo is the sum signal, operating the AGC in sum/difference mode can help maximize loudness on mono radios. Additionally, sum/difference mode can give a type of stereo enhancement that is different from the enhancement modes offered in the 9400’s built-in stereo enhancer. This will only work if you allow the two channels of the AGC to have different gains. To do this, set the AGC MAXIMUM DELTA GAIN REDUCTION control greater than zero. AGC Ratio determines the compression ratio of the AGC. The compression ratio is the ratio between the change in input level and the resulting change in output level, both measured in units of dB.
OPTIMOD-AM DIGITAL OPERATION 3-41 Previous Orban AM processor AGCs had compression ratios very close to :1, which produces the most consistent and uniform sound. However, the 9400 compressor can reduce this ratio to as low as 2:1. This can add a sense of dynamic range and is mostly useful for subtle fine arts formats like classical and jazz. This control reduces the available range of AGC gain reduction because it acts by attenuating the gain control signal produced by the AGC sidechain. The range is 25 dB at :1 and 12 dB at 2:1. However, the range of input levels that the AGC can handle is unaffected, remaining at 25dB. AGC Bass Threshold determines the compression threshold of the bass band in the AGC. It can be used to set the target spectral balance of the AGC. As the AGC B CPL control is moved towards “100%,” the AGC BASS THRESHOLD control affects the sound less and less. The interaction between the AGC BASS THRESHOLD control and the AGC B CPL control is a bit complex, so we recommend leaving the AGC BASS THRESHOLD control at its factory setting unless you have a good reason for readjusting it. AGC Idle Gain. The “idle gain” is the target gain of the AGC when the silence gate is active. Whenever the silence gate turns on, the gain of the AGC slowly moves towards the idle gain. The idle gain is primarily determined by the AGC DRIVE setting — a setting of 10 dB will ordinarily produce an idle gain of –10 dB (i.e., 10 dB of gain reduction). However, sometimes you may not want the idle gain to be the same as the AGC DRIVE setting. The AGC IDLE GAIN control allows you to add or subtract gain from the idle gain setting determined by the AGC DRIVE setting. You might want to do this if you make a custom preset that otherwise causes the gain to increase or decrease unnaturally when the AGC is gated. For example, to make the idle gain track the setting of the AGC DRIVE control, set the AGC IDLE GAIN control to zero. To make the idle gain 2 dB lower than the setting of the AGC DRIVE control, set the AGC IDLE GAIN control to –2. AGC Bass Attack sets the attack time of the AGC bass compressor (below 200Hz). AGC Master Attack sets the attack time of the AGC master compressor (above 200Hz). AGC Bass Release sets the release time of the AGC bass compressor. AGC Master Delta Threshold allows you to set the difference between the compression thresholds of the sum and difference channels. (This control is only useful when you set the AGC MATRIX to SUM/DIFFERENCE.) If you set the threshold of the difference channel lower than the sum channel, the AGC will automatically produce more gain reduction in the difference channel. This will reduce the separation of material with an excessively wide stereo image (like old Beatles records). To make this work, you must set the AGC MAXIMUM DELTA GAIN REDUCTION control away from
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Operating Manual OPTIMOD-AM 9400 Di
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IMPORTANT SAFETY INSTRUCTIONS All t
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Manual PLEASE READ BEFORE PROCEEDIN
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Operating Manual OPTIMOD-AM 9400 Di
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Headphones ........................
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Gain Reduction Metering ...........
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SPECIFICATIONS ....................
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Index 8 8200ST 2- · 14 9 9400 HD 2
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PC Remote software 3- · 61 remote
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OPTIMOD-AM DIGITAL INTRODUCTION 1-1
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6-2 TECHNICAL DATA ORBAN MODEL 9400
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OPTIMOD-AM DIGITAL TECHNICAL DATA 6
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Optimod-AM 9400 V1.2 Operating Manual - Orban

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