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Bass and Treble Limiters are used for protecting Cutterheads against exessive mecanical excursions
We offer two models:
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DBL10 Dynamic Bass Limiter
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DBTL20 Bass and Treble Limiter
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DBTL20 is a combined stereo Bass and Treble limiter. Its Bass limiting functions and specification are exactly the same as described below for DBL10 Dynamic Bass Limiter. In addition DBTL20 has treble limiting function.
The function of the DBL10 filter limiter is to reduce excessive signal levels in the low frequency range from zero to 800 Hz in order to obtain optimal programme signal in sound reproduction systems and to protect terminal equipment such as cutterheads or analog/digital converters from overload. The unit has also proven to be an invaluable tool in other kinds of sound systems such as tape mastering, soundtracks, broadcasting, microphone interviews etc.
The DBL10 Dynamic Bass Limiter offers two separate channels of bass filtering with dynamic regulation with respect to the programme signal. Both the signal level and the crossover frequency are regulated at the same time which means that a heavier (more selective) filter action can be allowed before it becomes audible. The limitation will only influence the audio signal in the relatively limited frequency range where action is needed thus making the regulation undetectable for the human ears. At normal levels the filter is completely transparent to the signal and action will take place only if critical peak signals are introduced.
Primarily this unit is constructed for use in disc cutting systems where it is essential that high peaks in the bass region are limited since such peaks may cause distortion when the record is played back or even be impossible to cut because of the physical excursion of the cutting stylus in relation to the groove width.
Peaks of longer duration may also overload the cutterhead and either cause a drop out of the thermal protection circuit or even damage the cutterhead.
In digital systems it is essential that the A/D converters are protected against overflow which otherwise would result in unpredictable distortion. By limitation of excessive audio peak levels the overall recording level becomes less critical. In practice giving less troubles in the master room and results in less rejections and higher production flow.
The DBL10 front panel is equipped with sensitivity selector to control the overall filter action as well as Attack and Release selectors to control the speed of action. Although the DBL10 is a stereo unit all selectors can be operated individually on both channels for precise settings.
Two light bars on the front panel roughly indicate the filter action. On the back of the unit are located rejection outputs which can be monitored with a spectrum analizer thus giving an exact image of what's actually being subtracted from the signal path.
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Ortofon disc cutting equipment - Bass & Treble Limiter for Cutterhead protection
