Yorkville Sound AP812 ユーザーズマニュアル

you can achieve a vaguely similar result by simply turning up the level until a mic feeds

back, then reacting accordingly (this may or may not involve the EQ’s). In any case, the

prime suspect whenever feedback starts is always a

monitor. A graphic EQ with a MIC

level input can be inserted between the offending mic and the mixer input to solve that

channel’s problem without altering the whole monitor system response.

Effects Bus Routing Overview

The

AP812/818’s effects bus receives and mixes down all the channel EFX SEND sig-

nals. Its output is regulated by the

MASTER EFX SEND control and is internally routed,

first to the

EFX SEND / FOOTSWITCH jack. This is a switching jack which normally

allows the signal to proceed

internally to the effects pro-

cessor. But when a jack is

inserted here, the switching

function reroutes the effects

bus signal out the jack to

either an on/off footswitch or

whatever you have patched

it to, probably an external

effects unit, or possibly

something else if you have

decided to do without effects

and perhaps feed a broadcast

transmitter or recording unit.

In any case, the output of the

internal digital effects proces-

sor is permanently routed

to the

MASTER EFX fader

and thereafter to the

LEFT &

RIGHT MAIN MASTER bus-

ses, also to the

EFX to MON

master control and thereafter

to the monitor bus.
Master EFX Send

Control & Clip LED

For the quietest performance,

you should run the

MASTER EFX SEND level as high as possible without causing distor-

tion. With the channel

EFX SEND controls turned up roughly half-way and signals com-

ing into the channels, increase the

MASTER EFX SEND level until some EFX CLIP LED

activity is observed, then turn it back down slightly until the flashing stops. You may now

re-adjust the channels

EFX levels as desired. The MASTER EFX SEND may now be used to

tailor the

EFX mix on all channels at once.

Digital Effects Processor

The internal Digital Effects Processor is a full

16 bit, 20 kHz bandwidth DSP-based effects

subsystem developed by

Applied Research & Technology in Rochester, New York. It has

been custom programmed with

255 effects ranging from reverb to echo and special effects.

The selection of effects was determined in collaboration with a panel of sound engi-

neers experienced in live performance mixing. The panel was asked to choose effects

which would be of the most practical use in actual live performance situations. As

a result you will find the

internal system to be more

than adequate for most

applications.

EFX Footswitch/

Send Jack

A standard on/off footswitch

(optional) plugged into this

jack will enable you to turn

the internal effects system