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CONTROLS & CONNECTIO NS
Channel B
Channel B of the DEQ 624 is a duplicate of Channel A. All controls, encoders and
LED indicators found on Channel A are found on Channel B.
REMEMBER: When Channel Master A is engaged, all of Channel B' s controls
are disabled!
Adaptive Hum Cancellation (AHC)
Adaptive Hum Cancellation has been incorporated into the DEQ 624 for the express
purpose of reducing 50 Hz or 60 Hz line noise. This very common audio artifact is
typically caused by ground loops and can be successfully removed by AHC. AHC is
in learning mode when turned OFF. While in this mode, AHC monitors the
noise/hum level. Corrective waveforms are continuously updated based upon
noise/hum coming into the unit. When AHC is turned ON the last corrective
waveform is applied to the audio data. Should the noise level change and AHC
become ineffective in controlling the noise/hum, it is then necessary to turn AHC OFF
for a few seconds so it can adapt to the new noise level and then be selected again by
pressing the switch to the ON position to resume operation.
Presets
The DEQ 624 can store up to four programs. Stored programs can be recalled by
selecting the desired program with the Preset switch located at the right end of the
front panel of the unit. Pressing the Preset switch repeatedly cycles through the four
Preset positions. Stopping on a program for approximately three seconds causes the
stored program in that position to load and the unit to operate in that Preset mode
(NOTE: All EQ encoders, controls, and switches with the exceptions of the
Store / Security switch and the Preset switch are disabled when a program is
recalled).
S T O R I N G P R E S E T S / P R O G R A M S
The Store / Security switch is used to store Programs (Note: Programs cannot
be stored if Channel A HI Q, Channel B HI Q or the Preset switch are in the
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