Yorkville PGM8 - Manuel (Page 5)

3
shield tab making sure that it does not touch anything else. Now re-assemble the plug
and mark it with some tape for future reference. This will be the end that you plug into
the unbalanced music source (this will also work with an RCA connector).
For best performance when connecting turntables, a phono RIAA pre-amplifier must
be used to connect to the PGM8 inputs.
Connecting signals to both types of inputs on any one channel (MIC and LINE in) is
NOT recommended. To do so may change the gain of the input circuit.
3. Gain Control
PGM8 features active channel input circuitry with exceptionally high audio headroom. The
Gain control adjusts the input gain level to match it with the input audio signal level.
There are two gradation circles on the gain control. The outer one (-24 dB to +60 dB) is
the gain for the Mic Input, the inner one (-36 dB to +45 dB) is for the Line input. Since
this control has a range of 84 dB, it presents the user with a wide range of gain control.
Here’s a quick way during a sound check to ensure that the Gain is adjusted correctly for
the highest headroom and lowest noise. First turn the Channel Fader to the infinity symbol.
With a music source playing into the mixer’s channel turn the Gain control clockwise until
the Set Level LED begins to flash. Having the Set Level LED flashing shows you that you have
the optimum gain setting for the music level on that channel input. Having the Set Level
LED remain on continuously indicates that you should turn down the Gain control until the
Set Level LED is flashing. Having the Set Level LED remain on continuously indicates that the
input audio compressor is active. Now turn up the Channel Fader to the desired audio level for
the overall music mix. How to use the input audio compressor is explained below.
The PGM8’s Clip LED will turn on at 3 dB below the onset of actual clipping. It is
acceptable to have this LED flash occasionally during music peaks. You will find that
this or any audio system performs with less distortion and less noise when the gain
controls are all set properly.
4. Input Channel Audio Compressor
Each of the mono input channels of the PGM8 (channels 1-4) have an internal dual-
slope soft-knee audio compressor. The PGM8’s compression function is suitable for
bass guitars, percussive sources, and vocals.
A compressor reduces the dynamic range of the music providing a more constant
level. Like having a sound engineer dynamically adjusting the gain of each channel
for the optimum audio level.
The PGM8 compressor works automatically in the background. It can reduce clipping of
the audio signal during loud passages in the music, or adjusted by the user providing a
tighter sound typically heard in audio recordings. You can adjust how much compression
you want with the input channel Gain control.
Here’s how to use the compressor. In automatic mode, set the Gain level so that the
Set Level LED is just blinking to the music. The compressor will remain off until someone
yells into the microphone or there is a loud percussive sound then the compressor will
reduce the gain reducing the possibility of clipping. To adjust for little to no compres-
sion, have the music source playing into the input channel. Turn up the input channel
Gain control to the point where the Set Level LED is just blinking with the music. At this
point the full dynamic range of the music source will be experienced. Continuing to turn
the input channel Gain control clockwise, the music will get louder. To maintain the same
audio level turn down the Channel Fader for the channel being adjusted. The further the
input channel Gain control is turned clockwise, or the louder the music source becomes,
the greater the compression will be experienced.
If the Clip LED blinks occasionally then the maximum amount of compression has been
reached. If the Clip LED remains on for longer periods, turn down the Gain level until
the Clip LED blinks occasionally.
Clip Set Level
Pan
EFX
Mon
Low
80Hz
Mid
2.5kHz
High
12kHz
80Hz
1
Clip
Mute
0
5
2 8
7
6 4
3
9 1
10
-15 +15
0
dB
-15 +15
0
dB
-15 +15
0
dB
0 10
dB
24
12
6
10
-
+
0
6
0 0
3
24
12
6
-
+
0
0 0
3
Gain
dB
mic
+35
+20
+40
-24 +60
0
+10
-10
-36 +45 line
+30
+20
-20
0
+10 Gain
Control
Channel
Fader