1. Introduction
The Symetrix Model 201 EQ/Preamp provides studio quality
equalization and notch filtering for line level balanced or
unbalanced signals, as well as for low level unbalanced signals.
Three fully parametric bands of equalization are provided, with
+15dB boost and -30dB cut capability, allowing the SX201 to be
used for both creative and corrective equalization. Overlapping
frequency controls cover the audio range, from 16Hz to 20kHz.
Bandwidth is continuously variable from .05 octaves (for deep
notch filtering), to 3.3 octaves (for smooth tone shaping).
With its separate line and preamp inputs, the SX201 will handle
nearly any signal level. The line level input provides both
balanced or unbalanced terminations, while the preamp input is
unbalanced. The line level input is intended for use with signals
that have already passed through a preamplifier. The preamp
input provides 30dB gain, and is intended for use with low level
signals such as those from synthesizers, guitars, bass guitars, or
electronic drums. The overall input level control allows the
operator to set internal signal levels to match boost/cut
conditions.
Parametric equalizers are so named because their operating
parameters (characteristics) are variable. The SX201 is described
as fully parametric because the center frequency, the bandwidth,
and the amount of boost or cut, are all user adjustable.
1. Center frequency is defined as the frequency, measured in
Hertz (Hz), that is at the center of the range of frequencies
controlled by the equalizer.
2. Bandwidth is defined as the range of frequencies, measured in
octaves or fractions of octaves, that are controlled by the
equalizer.
3. Boost or cut is defined as the amount of increase or decrease,
measured in decibels (dB), that the equalizer provides at the
center frequency.
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