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8
Operation
General Advice
Proportional-Q principle
Low-, Mid- and High filters operate to the proportional-Q principle. This
means that maximum possible boost and cut is dependant upon the
selected bandwidth. If the bandwidth is increased the measure of boost or
cut (=amplitude) decreases automatically with the setting of the Cut/Boost
control. Obversely the amplitude increases automatically as the bandwidth
decreases.
This has two practical advantages: a large bandwidth is automatically
treated more sensitively than a narrower bandwidth. This is in line with
human hearing sensitivity and allows efficient processing. In addition
further adjustment of the Cut/Boost control is no longer necessary when the
bandwidth is varied. With other common,constant-Q EQs an increase of the
bandwidth leads to magnification of the overall volume so that the
processed band sounds unnatural and unmusical.
Recommendations for the setting of bandwidth (Q)
To some degree the bandwidth shown on the unit relates in inverse
proportion to the octave bandwidth displayed, which is often used to
describe the bandwidth. The maximum adjustable Q-value 5 (narrowest
bandwidth) relates to approximately 0.2 octaves on the Stereo Q; the
minimum Q-value 0.5 (greatest bandwidth) is approximately 2 octaves.
Bandwidth adjustment is always dependant on the program or
instruments to be used. It is not possible to lay down hard and fast
rules but the following recommendations are provided:
Q-values between 1 and 2 are as a general rule most suitable for proces-
sing of voices,keyboards or acoustic instruments with inbuilt microphones.
High Q-values between 3 and 5 are often used for processing of extremely
high frequency spectrums to enable accurate correction.Larger bandwidths
are utilized in the high tonal range when,for instance,refinement of muffled
material over a broad bandwidth is required.Nevertheless the air band filter
of the Stereo-Q already produces excellent results in this respect so that the
high band filter can be used to achieve even further accurate correction.
In the bass range larger bandwidths (approx. Q 0.5 to 0.8) are more
frequently selected to provide even processing of the deep tonal ranges.
However the possibility of a combination of Sub Bass and Low filters should
be considered because this permits broad band processing with the Sub
Bass and precise correction on the low band.
Generally medium Q-values (approx. 0.8 to 1.2) are suitable for frequency
ranges from 100 Hz to 700 Hz.
info