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breaker would open as soon as the AP312’s POWER switch was flipped on. If this
breaker opens more than once in a short space of time, try plugging the AP312 into
another power outlet.
Rack Mounting
To rack-mount the AP312 you will need to purchase a pair of the accessory model RK812
rack ears, then simply remove the three screws holding each of the AP-312’s two end mold-
ings in place and use the screws to mount the rack ears to the sides of the mixer
General Operating Instructions
1. Connect the AC power cord to a 120Volt AC grounded power outlet (220 to 240
Volts in export units).
2. Switch on the POWER and turn the MAIN and MONITOR MASTER controls to
OFF for now.
3. Connect low-impedance microphones to the 3-pin XLR type MIC inputs.
4. Connect high-impedance mics or mono line-level signal sources - i.e. amplifier
line outputs, the output of a mono-mixer, an electric instrument, etc. to the 1/4-
inch BAL LINE IN jacks. Do not connect more than one thing to any of these
channels, that includes stereo outputs (if you try to connect a stereo source to a
mono channel using a Y adapter, you may get distortion).
5. Connect stereo sources - tape deck, CD-player, stereo keyboard, instrument, etc.
- to channels 9/10 and 11/12, either via the RCA (phono) type inputs or the 1/4-
inch BAL LINE IN connectors. Once again, connect only one signal source per
channel and use shielded patch cords for all pre-amp connections. Stereo sources
may be connected to channels 1 through 8 if you use two of them, one panned
left, the other right.
Note A: The following setup applies to the system with the EQ/AMP ASSIGN button down
in the MAIN/MON position. This is with a mono main mix going to AMP 1 and the monitor
mix going to AMP 2 so that the whole system is being powered by the AP312.
6. Using heavy-gauge speaker cables (see under SPEAKER CONNECTIONS) connect
one 8 ohm main PA speaker to the AMP 1 SPEAKER outputs on the back panel.
Similarly, connect one 8 ohm monitor to the AMP 2 SPEAKER output
7. Position your main PA speakers at the front of the stage, pointing directly out at
the audience and position your monitor speakers on the stage floor, in front of
the mic stands, pointing up at the backs of the mics (remember to use cardioid or
uni-directional mics to reduce the threat of monitor feedback).
8. During a sound check with the band playing or other sources feeding the mixer
inputs, make the following control adjustments::
a) Set the channel LOW, MID & HIGH EQ controls and PAN or BAL controls to
center. (Note; the PAN controls will have no effect now that the main mix is
mono so you can ignore them). Now set the channel GAIN, MON and EFX
controls to OFF, the channel fader all the way down, and the GRAPHIC EQ
sliders to the center position
User Tip: Since the main mix has been converted to mono by the EQ/AMP ASSIGN
button being in the MAIN/MON position, you can use the 1/4-inch INPUT jacks on