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The Maselec MPL-2 is a brick-wall and high frequency limiter. It can be used to achieve high subjective levels and reduce unwanted high frequency levels (de-essing).

The MPL-2 is also used to 'smooth' and give digital recordings a more 'analogue' character. The MPL-2 is housed in a 1U 19" rack mount alloy case.

A minimum of controls is used due to automatic time constants and optimisation techniques for the gain reduction. The advantage is not only simple operation but also increased performance for highly dynamic and inconsistent materials without the need for continuous readjustments.

The input gain does not reduce the wide dynamic range of the limiter. It can be used at its maximum setting with no increased risk of distortion. This eliminates the need for excessive levels, which could cause clipping in equipment feeding the input of the limiter. A further benefit is that the maximum peak output level (set with the threshold) is independent of different gain settings.

High Frequency Limiting is primarily intended for use as a de-esser, reducing unattractive high frequencies. Part of the high frequency limiter circuit is also used to reduce distortion from the wideband limiter.

Users of the MPL-2 will notice the removal of spurious peaks, and an increase of subjective levels, without the coloration and increased distortion so often associated with soft clippers and other ultra fast limiters.
  • Prevent peak levels from exceeding a pre-set limit.
  • Increase subjective loudness of programmes.
  • Give digitally recorded programmes a more 'analogue' character.
  • Introduce a soft 'levelling' function for large differences in average programme levels.
  • Reduce dynamic range of programmes to maximize the performance of AD converters.
  • Add no audible 'pumping' resulting from limiting.
  • Have a well-defined threshold, with no need for programme related adjustments.
  • Specifications
  • Input dynamic Range : Better than 115dB
  • Output dynamic range : 96dB to 115dB (depending on gain and threshold settings)
  • Maximum input level : 129dBu (balanced)
  • Maximum output level : 129dBu (balanced)
  • Distortion : Typically less than 0.003%
  • Limiter attack time : Instant
  • HF limiter attack time : Programme dependent 1msec to 20 msec
  • Release time : Programme dependent
  • Input impedance : 100 kOhms ground floating electronically balanced
  • Output impedance : 34+34 Ohms electronically balanced
  • Threshold : +12dBu to +20dBu
  • H.F. Threshold : -14dBu to +20dBu
  • Gain : 0dB to 10dB
  • H.F. Limiter : >2kHz
  • Power : 90-130, 180-260 Volts @ 50-60 Hz
  • Fuse : 315mA, anti surge (slow)
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