The effects unit
16 fixed effects programmes are available. The individual pro-
grammes are printed on the front panel: 9 different reverbs, 3
delays (echo), 2 gated programmes (short reverb without fade),
1 reverse echo and 1 special delay (longer echo).
Individual programmes are chosen by the
Program Select
switch and the programme number is digitally displayed.
The
Effect on/off
switch activates the effects unit. When swit-
ched off, the numbers display shows two horizontal lines. When
switched on, it shows the number of the selected programme.
The effects can also be switched on and off by a conventional
footswitch connected to the Effect on/off jack socket. TFor this
purpose the Effect on/off switch must be switched on.
The
Effect Volume
control regulates the internal output volume
(internal return) of the effects unit. The control position is impor-
tant for regulating the noise generated by the effects unit.
All digital effects units have a limited signal to noise ratio (SNR)
(quantizing noise).
The integrated Alesis module's SNR is around 45 - 50 dB and
the input chanels have an SNR over 70 dB. If something in the
power mixer is making a noise then it's the effects unit and, in
order to avoid it, the following settings are to be recommended:
Turn up the
effect volume
control till the noise is audible but
not yet disturbing. Then turn up the
Gain
control, the
Effect
Send
control and the
channel volume
control as far as possi-
ble, because the effects input volume depends on these con-
trols.
The
stronger
the effect is regulated at the input, the less the
Effect Volume
has to be turned up. This is the way to keep the
effect volume down and thus reduce the noise from the effects
units.
Example of minimum noise setting
(with one microphone connected)
We recommend the following grade settings:
Gain
: turn up to a point where the red LED does not quite light
up.
Effect
: 7 - 9
Volume
: 7 - 9
Master Volume
: 5 - 8
Effect Volume
: 5 - 8
The same applies to the internal effects: the unit's input volume
should be set as high as possible so that the output volume
(and accompanying noise) can be kept low.
PD 6·12, MD 6·12 owners manual
14
owner`s manual PD 6·12 © 1992, 1993 Zeck Music
Technische Daten / Technical Data
PD 6·12
Nennleistung
8 Ohm
2 x 150 W
Nominal rating
4 Ohm
2 x 200 W
Frequenzumfang
Mixer + Power Amp
18 – 25 000 Hz /–2dB
Bandwidth
Effects
40 – 14 000 Hz /–2dB
Gesamt-Klirrfaktor ohne Effects
< 0,1 %
Total harmonic distortion with effects off
Intermodulationsverzerrungen
max. 0,03 %
IM distortion
Äquiv. Eingangsrauschen,
bezogen auf 200 Ohm
– 124 dB
Equiv. input noise at 200 Ohms
Geräuschspannungsabstand
Signal to noise ratio
Masterfader max.
Eingangsfader min., EQ flat
– 73 dB
Master fader max.,
Input fader min., EQ flat
Ausgangsimpedanz
Speaker
min. 4 Ohms
Output impedance
Line Out
300 Ohms
Eingangsimpedanz
Mic Input
2,2 kOhms
Input impedance
Line Input
10 kOhms
Aux Return
47 kOhms
Tiefe /
Depth
280 mm
Abmessungen
Höhe /
Height
5 HE
Dimensions
Breite /
Width
19 "
Gewicht
20 kg
Weight
2 Jahre Vollgarantie /
2 years full guarantee
