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_files/sound/bss/london/manual/MAIN/MAINCompressor.htm
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_files/sound/bss/london/manual/MAIN/MAINCompressor.htm
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<!doctype HTML public "-//W3C//DTD HTML 4.0 Frameset//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
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<meta name="generator" content="Adobe RoboHelp 9">
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<title>Compressor</title>
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<meta http-equiv="imagetoolbar" content="no" /><![endif]-->
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<!-- Head Scripts -->
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<link rel="stylesheet" href="HtmlHelp.css" type="text/css">
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<style title="hcp" type="text/css">
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<!--
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span.hcp1 { font-style:italic; }
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span.hcp2 { font-weight:bold; }
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-->
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</style>
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</head>
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<body class="ns-0 ltr">
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<div id="globalWrapper">
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<div id="column-content">
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<div id="content">
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<h1 class="firstHeading">Compressor</h1>
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<div id="bodyContent">
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<p id="siteSub"><img src="Compressor.JPG" alt="" border="0"></p>
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<p>A fully featured compressor with the classic BSS 'progressive
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knee' sound, which produces a gentle ratio near the threshold
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becoming progressively more aggressive further into compression.
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An auto-release mode not only allows the release time
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to be related to the user-set attack time, but also varies
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this relationship depending on the nature of the program
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to give a very natural sounding result. Two versions of
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the compressor are available, a single channel version,
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and a stereo version, where two independent audio channels
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are controlled by a single control panel, the side chains
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being locked together to prevent stereo image shifts.</p>
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<p> </p>
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<h2>Inputs and Outputs</h2>
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<p>The single channel compressor has one audio input and
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one audio output.</p>
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<p>The stereo compressor is identical to the single channel
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version except that it has 2 inputs and 2 outputs. Adjustment
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of controls has the same effect on both channels.</p>
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<br>
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<div class="editsection" style="float: right; margin-left: 5px;">
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<p> </p>
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<h2>Properties</h2>
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<p> </p>
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<h5>Side chain</h5>
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<p>A side chain input can be made available so that
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an equaliser for example can be introduced to make
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compression frequency conscious. Any side chain processing
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would normally derive its signal from the same source
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that is fed to the audio input of the compressor.</p>
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<p> </p>
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<h2>Control Panel</h2>
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<p><img src="Compressorcp.JPG" alt="image:Compressorcp.JPG" title="image:Compressorcp.JPG" style="border-width: 2px;
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border-style: solid; margin-top: 0px; margin-bottom: 0px;
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margin-left: 0px; margin-right: 0px;" width="670" height="260" border="2"></p>
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<p> </p>
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<p> </p>
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<h4>Threshold control</h4>
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<ul>
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<li class="p"><p>Adjusts the level threshold above
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which compression will take place. Below this
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threshold, no compression will take place.</p></li>
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</ul>
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<p> </p>
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<h4>Ratio control</h4>
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<ul>
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<li class="p"><p>Adjusts the aggressiveness of
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compression.</p></li>
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</ul>
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<p> </p>
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<h4>Gain control</h4>
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<ul>
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<li class="p"><p>Adjusts out any <a href="Gain.html">gain</a>
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anomalies.</p></li>
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</ul>
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<p> </p>
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<h4>Attack control</h4>
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<ul>
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<li class="p"><p>Adjusts the time it takes for
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the compressor to respond to signal levels above
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the threshold.</p></li>
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</ul>
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<p><span class="hcp1">Note that this
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control also affects the release time in 'Auto Release'
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mode.</span></p>
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<p> </p>
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<h4>Release control</h4>
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<ul>
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<li class="p"><p>Adjusts the time it takes for
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the compressor to recover after the signal level
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goes below threshold.</p></li>
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</ul>
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<p><span class="hcp1">Note that this
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control has no effect in 'Auto Release' mode.</span></p>
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<p> </p>
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<h4>Bypass button</h4>
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<ul>
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<li class="p"><p>Removes the compressor from the
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signal path.</p></li>
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</ul>
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<p> </p>
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<h4>Auto Release button</h4>
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<ul>
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<li class="p"><p>Automatically adjusts the release
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time optimally for the programme material.</p></li>
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</ul>
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<p><span class="hcp1">Note that the
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time constants are still dependent on the attack setting.</span></p>
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<p> </p>
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<h4>Gain Reduction meter</h4>
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<ul>
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<li class="p"><p>Displays the amount of gain reduction
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being applied.</p></li>
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</ul>
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<p> </p>
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<p> </p>
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<h2>Notes</h2>
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<p><span class="hcp2">!</span> This object
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will cause audible distortion if the Attack and Release
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times are too fast since it will be trying to apply
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dynamic gain reduction to the instantaneous values
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of lower frequency waveforms.</p>
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<p><span class="hcp2">!</span> This object
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is capable of raising signal levels beyond the clipping
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point so; care should be exercised when using positive
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gain values.</p>
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</div>
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</div>
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</div>
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</div>
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</div>
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<p style="margin-bottom: 0;"> </p>
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</body>
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</html>
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