MORLEY PCB PRO COMPRESSOR Owner's manual

MORLEY PCB PRO COMPRESSOR Owner's manual
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GENERAL INFORMATION
DEAR MORLEY OWNER
Tou are about tó use one of the finest effecr
boxes made. Morley products are designed for
years of trouble free operation. To insure
maxi=um satisfaction please take time to read
this booklet which points out many features of
the product, some of which may be new to you.
PONER SOURCES - Battery and AC (mains)
All Morley effect boxes are designed to oper-
ate from one or two 9 volt (NEDA 1606A) bat=
teries or an optional AC (mains) adapter.* The
battery can be installed by removing the 4
screws which hold che bottom cover in place.
The adapter automatically disconneces the bar=
tery when ic is plugged into che effect box,
thereby prolonging bartary life.
The adapter is more economical to use than
batteries, however there are times when using
the battery is more convenient. Morley there-
fore provides both capabilities.
%
INDICATORS (LED) Lamps
The use of two indicator lamps tells you when
power Ls on, or if either or both sources are
not functioning (such as a dead battery) or
the adapter 15 not plugged into a live recep-
tacle.
In addition the two indicatore tell when the
musical effect £s turned on or the unit has
been switched te the normal signal condition.
LOW NOISE
All electreníe devices peneraté some noise.
Good design and marerials make possible high
signals relative to the amount of noise. This
"high signal to noise ratio" can make the noise
virtually unnoticeable. Thia characteristic
and capability is very izportant in the design
of all Morley products.
5. HIGH INPUT IMPEDANCE
This i= important because the effect box can
operate from very weak or high impedance sources
without loading down the signal.
6. LOW OUTPUT IMPEDANCE
This 15 Important because it reduces high fre-
quency losses and hum pickup by the cable which
cones from the output side of the effect box. It
makes it possible to use much longer cables over
greater distances without signal deterioracion
and reducas or eliminates loading by the device
Co which it connects.
SET UP AND OPERATING INFORMATION
Plug a cord from a signal source, or musical instru=
MENE, été., into the jack marked “Input.” This will
automatically turn the power on and one of che indi-
cater lamps will light. If a power adapcer ds used,
the unir Will turn on and the lamp will light with-
gut the signal cord belong plugged in.
Plug another cable from the jack marked "Output" and
connect it to che input of your amplifier.
Activate the foot switeh. The lamp that iz lie will
go off and the other one will come on. Set it so
the "effect off" lamp lights. Now make some sounds
from the instrument and set the amplifier for its
normal response. Next activate the foot switch one
time which will turn on the effect.
PRO COMPRESSOR (РСЯ)
A compressor is a very special type nf pré-amplifier
or low level amplifier. Ordinary amplifier have a
fixed amount of gain or amplification which remains
constant for any one setting of the gain control. A
compressor has a variable gain which is dependent
upon the strength of the signal applied to its input.
Any algnal above some mid-level causes the gain co
diminish and any signal below that mid-point causes
tha gain ro increase more and more as the signal dies
out.
LÉ à guitar string is plucked vary hard and the sig
nal is passed Through the coapréssor the loud tone
at the onset of the note will not be as loud as it
would have been without the compressor. As the nob:
gets weaker the райпо of the compressor continues co
increase, keeping the volume more nearly constant
for a much longer time than 1f the compressor had
not been there. The result is sustain without no-
ticeable distortion. Compressors can also be used
to prevent or reduce overloading in amplifiers or
ather devices which might otherwise create undesir-
able types of distortion on high signal levels.
CONTROL SETTINGS
The controls go Co maxloum in che clockwise direc=
tion.
It ie suggested the “Output” contral be turned up
carefully and sparingly since on low level and no
signal conditions, thera iz a great deal of gain in
the syscen Which could cause feedback and noise.
Set Che "Compress-Sustain" to as much of the effect
as is desired.
* No less than 12 volts.
See adapter requirements on bottom of unit.
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