Note that increasing Density will not cause the final clipper to be overdriven
because those controls are also ganged to the Density control to ensure that
distortion will not increase as Density is increased.
Low/Warm EQ
(we’re leaving Loudness for last!)
The Low/Warm Equalization control adjusts how low frequencies sound on the
air. When the control is at “0” and has not been touched since a preset was taken
the factory determined equalization is applied. However, once the control has
been adjusted away from its “0” setting a new equalization scheme opens up.
As the control is turned counterclockwise (towards negative numbers) the bass
takes on a deep, robust character while the ‘mud’ that would normally occur with
such equalization, especially on automobile radios, is reduced through a gentle
parametric equalization cut at around 180-200Hz.
As the control is turned clockwise (toward positive numbers) the bass takes on a
fuller, warmer, ‘bigger’ sound and the gentle cut at 180-200Hz is removed.
Mid/High EQ
The Mid/High Equalization control acts in some ways similar to how the
Low/Warm EQ acts when adjusted. When the control is set at “0” and has not
been touched since a preset was taken, the factory equalization is applied.
As the control is turned counterclockwise (toward negative numbers), a broad
midrange boost is added along with some broad boost at very high frequencies.
The effect is to apply an overall ‘brightening’ to the sound. Note that in some
presets a slight high frequency roll off may be applied when the control is in
negative numbers.
As the control is turned clockwise (toward positive numbers) midrange boost is
minimized and a very high frequency boost is progressively applied. The effect is
to add sparkle and sheen to the audio without adding undesired stridency.
Loudness
Loudness does just what it says it does. Once the previous controls have been
adjusted for the desired texture, “Loudness” can be used to set the amount of
desired on-air loudness.
The Loudness control is ganged to certain controls within the 31 band limiter, FM
Limiter/Clipper and MPX processing.
Next we’ll address the HD controls, again keeping in mind that the HD
processing section shares the five-band AGC with the FM side to provide a
smooth crossfade between analog and HD signals on an HD-capable receiver.
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