Sound Performance Lab 2048 info

Operation General Advice

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.

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 100Hz to 700 Hz.

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