Speck Electronics EQ16 - Manual (Page 22)

The Model EQ16 utilizes 2 of the previously mentioned parametric
controls; the frequency select control and boost/cut control. These
controls are equally divided into 3 audio bands; low band: 50Hz to
500Hz, mid band: 500Hz to 5kHz, and the high band: 5kHz to 15kHz.
The bandwidth on the EQ16 is adjusted automatically when the sweep
control is adjusted.
The Model EQ16 is available in two versions: The EQ16-16; 16 mono
channels, and the EQ16-32; 16 stereo channels.
Each of the 16 channels of the Model EQ16-16 has a single signal path.
Each of the 16 channels of the Model EQ16-32 has two independent
signal paths for each channel and utilizes dual controls that
simultaneously adjust the left and right parameters of that channel.
Any channel of the EQ16-32 stereo version may be utilized as mono
channel by simply connecting to the left/mono input and left/mono
output jacks.
Each channel of the EQ16 has 3 bands of semi-parametric equalization;
Low, Mid and High bands. Each band has a frequency sweep control
that is calibrated in frequency, and a boost/cut control that is calibrated
in decibels. Each channel also has an EQ bypass switch and associated
LED. When this switch is in the "out" position, the equalizer channel
and all of its associated circuitry is totally bypassed. This should allow
you to accurately compare your equalized signal to the original signal.
Each band is continuously sweepable from its lowest to its highest
frequency; 50Hz to 500Hz for the low band, 500Hz to 5kHz for the mid
band, and 5kHz to 15kHz for the high band. Once the desired frequency
has been selected for any particular band (the center frequency), that
frequency may be continuously accentuated or attenuated (boost or cut)
from 0 to +15dB or -15dB.
The boost/cut control provides a reciprocal adjustment of the selected
frequency control. This means that whatever frequency is "boosted"
with the boost/cut adjusted from its center position clockwise, an
identical but opposite result is achieved when that same frequency
selection is "cut" from its center position counterclockwise.
18
FRONT PANEL CONTROLS
General
Frequency sweep controls
Boost/cut controls
Chapter 4 Operation Section