Phones Jack, Level Control & Sources

on and off. Optionally, this jack may be employed to feed the EFX signal to an external effects unit the output of which could be returned via an input channel - perhaps channel 9/10 or 11/12 (15/16,17/18) if the effects unit is stereo. In this mode, the channel fader would become the master effects return control, therefore be sure to set that fader fairly low and adjust to desired levels. Be sure to turn the EFX send control off in order to avoid creating a loop. Also, be sure to pull the EFX MASTER fader down to the off position.

The PHONES jack accepts standard stereo headphones and is located in the upper right area of the panel. The PHONES level control is located in the lower right area. The source for all headphone signals is the MONitor bus until a CUE button is depressed at which time only the cued channel can be heard through the phones.

Level Meters

These meters follow either the Left and Right MAIN bus activities or a mono mix of the mains on the Left-meterand monitors on the Right-meter, all depending on the position of the EQ/AMP ASSIGN button. If either or both CLIP lights at the top of the level meters is flashing too much of the time, lower the appropriate MAIN MASTER level to avoid possible distortion on peaks.

Amp 1 & 2 Inputs

These are switching jacks which enable you to directly access either or both chan- nels of the built-inpower amplifier while disconnecting them from normal internal functions. This permits you to insert an external-EQ, a processor /crossover (e.g. élite) or a compressor/limiter between the mixer section’s POST EQ LINE OUTPUTS and the AMP 1 & AMP 2 INPUTS thus pro- viding the 100% signal processing essential for these functions to work properly.

User tip: If you have an electronic-cross- over or processor/crossover, you can drive subwoofers and full-range cabinets in a

biamped system with the AP812/818. The hookup goes as follows:

1.With the EQ/AMP ASSIGN button down in the MAIN/MON position, run a patch cable from the POST EQ MAIN (L) LINE OUTPUT to the input on an electronic crossover/processor.

2.Now run a second patch cable from the low-frequency or subwoofer output on the crossover to the AP812/818’s AMP 1 INPUT and a third patch cable from the crossover’s high-frequency or full-range output to the AP812/818’s AMP 2 INPUT.

3.Now connect two 8 ohm subwoofers or one 4 ohm subwoofer to the AMP 1 SPEAKER connector/s and two 8 ohm full-range cabinets to the AMP2 SPEAKER connector/s.

4.The complete system is now functional, not including monitors. How-ever, if you need to vary the comparative volume levels of the subwoofer/s relative to the full- range cabinets, another setup will be required with an external power amp for the subwoofers or employing powered subwoofers. In that system, AMP 1 would be for full-range speakers and AMP 2 would be for monitors. In other words, this is a standard setup but with the MAIN (L) LINE OUTPUT going to the input of the processor/crossover and then to an external amp driving the subwoofer/s, or simply direct to the input of a powered subwoofer (ours have crossovers built in).