Speck Electronics ASC - Manual (Page 15)

11
We hope to give you basic information on the operation of the Model ASC
and adequately describe its controls, switches, and connectors.
The information in this manual is intended to help with the technical
process when using your Model ASC. Words alone could not adequately
describe how to adjust the controls on the Model ASC. Your ears should
be your best gauge of how to adjust the equalizer controls to make the
sound fit your requirements.
A parametric equalizer falls into the generic category called a “filter”. A
filter is an electronics circuit that allows signals of certain frequencies to be
transmitted through a system, while preventing the transmission of other
frequency ranges.
There are 3 basic types of passive or active filters; low-pass, high-pass and
bandpass.
A low-pass filter is a circuit that passes all low frequency signals and
rejects high frequency signals. The crossover point that low frequencies
pass through can be either fixed at a specific point or variable.
A high-pass filter is a circuit that passes all high frequency signals and
rejects low frequency signals. The crossover point that high frequencies
pass through can be either fixed at a specific point or variable.
A bandpass filter is a circuit that will pass only a fixed frequency band and
reject signals above and below the selected band.
A parametric equalizer is a very elaborate bandpass filter that offers the
ability to control the filter's basic parameters - hence the term "Parametric
Equalizer". These controllable parameters are the bandpass center
frequency, the amplitude of the bandpass frequency, and the width of the
bandpass frequency. These previously mentioned parameters as found on
audio parametric equalizers are commonly known as the sweep control,
boost/cut control, and bandwidth (Q) adjust respectively.
The Model ASC utilizes all the previously mentioned parametric controls.
Operation
General
Basic Theory
of Equalizers
Low-pass filter
High-pass filter
Bandpass filter
Chapter 3 Operation Section