3-58 Operation
HD LIMITING
x HD EQ GAIN – Determines the depth of high frequency shelving equalization produced by the parametric HF
shelving equalizer.
x HD EQ FREQ (Frequency) – Sets the corner of the parametric high frequency shelving equalizer
x HD Limiter Drive – Sets the drive level to the HD limiter.
x HD De-Esser – Reduces sibilance (‘ess sounds”) that might otherwise cause unwanted distortion,’
x FM>HD Control Couple – Links the HD controls to their corresponding FM controls when coupled.
2 BAND PROCESSING
In addition to five-band processing, suitable for pop music and talk formats, the 5950 offers a very high-quality
two-band algorithm. This is phase-linear and features the same AGC as the five-band processor, followed by a two-
band processor with look-ahead limiting. Sophisticated multiband high frequency limiting and distortion-cancelled
clipping complete the chain.
We believe that this is the ideal processing for classical music because it does not dynamically re-equalize high
frequencies; the subtle HF limiter only acts to reduce high frequency energy when it would otherwise cause
overload because of the FM preemphasis curve. We have heard four-band, allegedly “purist” processing that
caused dynamic HF lift. This created a strident, unnatural sound in strings and brass. In contrast, the 5950’s two-
band phase-linear structure keeps the musical spectrum coherent and natural.
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