Speck Electronics EQ16 - Manual (Page 25)

3. Mid boost/cut
6. Low frequency sweep
4. Mid frequency sweep
5. Low boost/cut
As long as you don't dramatically change the sound of the low frequency
audio, this could remove a little noise. Every little bit improves the
overall quality of your sound.
This control provides 15dB of bell shaped boost or cut for the mid band
(500Hz to 5kHz) frequency range, and is used in conjunction with the
high frequency sweep adjust (see item 4). 0dB boost/cut (flat) is
obtained when this control is set to its center position.
The mid frequency sweep control is used in conjunction with the high
boost/cut control and provides continuous adjustment from 500Hz (fully
counterclockwise) to 5kHz (fully clockwise).
This control provides 15dB of bell shaped boost or cut for the low band
(50Hz to 500Hz) frequency range, and is used in conjunction with the
low frequency sweep adjust (see item 6). 0dB boost/cut (flat) is
obtained when this control is set to its center position.
The low frequency sweep control is used in conjunction with the low
boost/cut control and provides continuous adjustment from 50Hz (fully
counterclockwise) to 500Hz (fully clockwise).
In addition to the ability to contour low band audio, the low frequency
controls may be used to reduce or eliminate low frequency hum or buzz.
Low hum is typically 60Hz, whereas buzz is typically 120Hz. If there is
a hum or buzz on an audio track, the low sweep control and associated
boost/cut control can be used to remove this.
To reduce 60Hz hum, start by setting the low frequency sweep control to
its fully counterclockwise (CCW) position; this is about 50Hz. Turn the
Boost/Cut control fully CCW. Return to the frequency sweep control,
and turn clockwise a little until the 60Hz hum has been reduced. This
setting is the 60Hz point. Now go back to the Boost/Cut control and
adjust as necessary.
In some extreme cases, it may be necessary to use 2 channels of
equalization in order to remove the undesirable affects of 60Hz or
120Hz hum.
This switch is used to enable or disable the equalization channel. In the
out position the equalizer channel is totally bypassed. When this switch
is depressed, the equalizer is inserted in the channel's audio path.
The green LED to the right of this switch illuminates indicating that the
equalizer has been inserted into the channels audio path.
21
7. Equalizer bypass switch
Chapter 4 Operation Section