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monitor system using the AP312’s EQ2 equalizer or an external EQ patched between
the AP312’s MON OUT jack and the external power amp you are using for monitors.
User tip: In order to shut a channel off completely, it will be necessary to turn down
the MON send, as well as the channel fader.
3-Band EQ
Equalization is varied by three controls labeled HIGH, MID, and LOW. Each control
can either boost or cut the amplitude of its frequency band by 15dB. This is a con-
siderable amount of gain change, roughly equivalent to a 150% variation in audible
loudness. It is therefore wise to use boost settings of not more than +3dB to +6dB in
order to avoid feedback and/or distortion.
User tip: On the other hand, -15dB of CUT-capability can come in handy for solving
certain mic or line problems. For example, substantial LOW and HIGH cuts can help get
rid of feedback plus puffing and thumping noises from harmonica mics. Flattop guitar
mics or transducers can often benefit from a slight MID cut to fatten the sound, and
direct or miked bass inputs usually benefit from a fairly substantial LO cut to avoid main
system distortion (do NOT put bass through the monitor system)
3-Band EQ - Channels (9/10 & 11/12)
LOW & HIGH shelving EQ is provided for the stereo channels. Here again, the gain
range is plus/minus (+/-)15dB. As a result, care should be taken in adjusting the EQ
above center position as a small adjustment can represent a large gain change.
Effects Send
The EFX send control varies the amount of post-EQ, post-fader channel signal
sent to the master EFX bus. The output of the EFX bus goes first to the EFX SEND
/ FOOTSWITCH jack and then to the internal 16-bit processor. The output of the
effects processor then goes to the MAIN master section to be mixed with the signals
going there direct from the input channels.
Cue Button - Channels (9/10 & 11/12)
The CUE feature enables you to preview channel signals via headphones before they
go to the main and/or MONitor bus. The CUE signal is post-EQ so that the channel
equalization will be in effect through the headphones. However, it is pre-fader so you
will need to shut the channel off through the mains and monitors when cueing. Use
the PHONES LEVEL to adjust cueing volume.
To employ this feature, simply follow these steps:
a) Connect a tape deck or CD-player to channel 9/10 or 11/12..
b) Pull the channel fader all the way down and turn the MON send to 0.
c) Depress the CUE button. Now that channel will have prominence through
your headphones.
d) Cue up your tape or CD track through the phones, then put it on play hold/
pause.
e) When you are ready to insert the recorded material, simply punch the CUE
button into the up position, then take the recorded material off play hold/
pause and bring up the channel fader and MON send to the desired mix lev-
els.
User tip: When you have inserted the cued material into the monitors, you will be
able to adjust its monitor mix level via headphones since the monitor bus signals
are always present through the phones when no channels are on CUE. The recorded
material’s main mix level will be audible to you through the main speaker system
Pan or Balance Controls
This control directs the post-fader output of the channel between the LEFT and RIGHT
MAIN masters. In a stereo setup, the PAN/BALance can be used to position the aural
image of the channel left or right within the stereo listening field.