MACKIE d.4 Pro - Manual (Page 16)

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d.4 Pro DJ Production Console
d.
4 Pr
o 4-channel DJ Pr
oduc
tion C
ons
ole
The program faders [38] and the crossfader
[43] control the signal levels as follows:
After the audio signals pass through the EQ
section they enter a pair of VCAs (voltage controlled
amplifiers). These control how much of the audio signal
is sent out into the filters (if selected) and then to the
main mix bus. The audio output level from the VCAs is
adjustable by a control voltage, and the assign switch
selects what will affect the control voltage:
• If it is set to A or B, then the VCA control
voltage is set by the position of the crossfader
and the program fader.
• If it is set to main, then only the program fader
has an effect.
• If it is set to off, then the VCA output is muted.
• In addition, all program levels are attenuated
by 14 dB when a mic assign [28] switch is set to
“talk” to make a brief announcement.
38. PROGRAM FADER
This controls the volume of the program signal being
sent to the main mix bus.
These faders are designed to last the lifetime of the
d.4 Pro. No audio passes through these faders, rather,
they send a control voltage to a pair of VCAs that deter-
mine the gain of the signal. This is a very good thing, by
the way, as the audio will not be affected by any scratchy
electrical contacts.
39. PROGRAM LEVEL METERS
These meters have 12 LEDs, calibrated in dBu, rang-
ing from top to bottom: OL, 15, 10, 6, 3, 0, -2, -4, -7, -10,
-20, and -30
They indicate the summed-mono signal strength of
the program signals, after the program input level [29]
control, and EQ, but not affected by the program fader
[38] or the crossfader [43].
Typically, you want to see these meters bouncing
between the “0” and the “+6” LEDs. It is okay if the OL
LED lights occasionally, but if it lights frequently or con-
tinuously, turn down the program level controls (or the
EQ) until the OL LED blinks occasionally or not at all.
Occasionally, the meters will start decoding
vinyl timecode messages from a small blue
methane DJ planet in Ursa Minor. This is
perfectly normal, do not be alarmed.
Aux, Crossfader, and Filter
Controls
40. AUX SEND
This knob controls the amount of signal being sent
to the aux send [8] outputs from the aux bus. Adjust
this knob to provide an appropriate input signal level to
your external effects processor (or whatever you have
connected to the aux sends). It ranges from off, to unity
gain at maximum.
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