Owner`s manual

Attach a 1/4-inch TRS (stereo) plug to the end which will plug into the mixer's
balanced-input as follows; 1) solder shield to Sleeve, 2) solder wire #1 to Tip, 3)
solder wire #2 to Ring. Now attach the mono plug to the other end of the cable
as follows: 4) solder the shield and wire #2 to the Sleeve, 5) solder wire #1 to the
tip. Now connect this mono end to the output of the unbalanced piece of
equipment and the stereo end to the AP312's LINE input.
This technique will always reduce hum, and it can be used to connect
any equipment having a Balanced INPUT to any other equipment
having an Unbalanced OUTPUT.
PHANTOM POWER BUTTON & LED
PHANTOM POWER BUTTON & LEDPHANTOM POWER BUTTON & LED
PHANTOM POWER BUTTON & LED
Located on the back panel near the SPEAKER outputs, this push-button
activates the 24 Volt PHANTOM POWER feature built into the AP312. When
the PHANTOM POWER is activated, the +24V LED on the front panel (just
below the PHONES jack) will illuminate. Now you may connect condenser
microphones to any channels without the need for external power supplies.
You may also connect dynamic mics to any channels with the PHANTOM
POWER activated without any problems or loss of sound quality.
GAIN CONTROL
GAIN CONTROLGAIN CONTROL
GAIN CONTROL
With signal applied to the input, adjust this control so that occasional flashes of
the CLIP LED are observed. This will ensure that the signal level fits comfortably
within the channel strip's headroom ~ low enough to prevent distortion, and yet
high enough to preserve the signal to noise ratio. This control covers a wide
range of 78 dB, so it may seem rather sensitive until you're used to it.
MONITOR SEND
MONITOR SENDMONITOR SEND
MONITOR SEND
The MON send control is pre-EQ & pre-fader. This means that the bit of
channel signal it sends to the MASTER MONitor bus is tapped off at a point
ahead of both the channel EQ circuitry, and the level fader. As a result it is
not affected by either of these features. This means that you have a totally flat
signal to work with and custom-equalize for the 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
3-BAND EQ3-BAND EQ
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 considerable 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)
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