connections. If however, the system has already been
working perfectly and the graphic is suspect, follow the
basic fault finding procedure given. If this does not
produce any results, contact your dealer, who will be able
to solve the problem quickly. Most malfunctions can be
traced to cable (input, output and mains) failure or to the
connections.
Each input channel is electronically balanced with one
female XLR connector. In accordance with IEC and
AES/ANSI standards the wiring mode is Pin 1 Ground, Pin
2 Hot and Pin 3 Cold. The 1/4” Jack socket is also wired
in parallel with the XLR’s. The Tip is Hot, the ring is Cold
and the Sleeve is Ground.
Balanced Operation: Use only when driving from a true
balanced source and driving to a true balanced
destination. Either transformer balanced or with active
drive. Connect the input between pins 2 and 3 with pin 2
positive. Do not connect pin 1. Attach the shield to
connector case (chassis ground). Connect the output
between pins 2 and 3 with pin 2 positive. Do not connect
pin 1. Do not connect the shield at this end to anything.
Unbalanced Operation: Connect the input between pins
2 and 1 with pin 2 positive and pin 1 earth (signal ground).
Short pin 3 to pin 1. Attached the shield to connector case
(chassis ground). Connect the output between pins 2 and
1 with pin 2 positive. Leave pin 3 open - Do not short it to
pin 1. Do not connect the shield at this end to anything.
Venue/room equalisation. The sound of any system will
sound different and vary with each location. Each location
will have different acoustic properties which will give it its
own distinctive characteristic. This is due to the reflection
and absorption rates of sound within the audio spectrum
of different venues. Though your source material may be
reasonably flat, the sound that is actually delivered to an
audiences ears after reflection and absorption is not.
Feedback control
Sound system feedback (howling or squealing) occurs
when the the sound waves originating at the speaker
return to the microphone and are re-amplified causing the
system to oscillate at its natural resonance frequency.
Many of the effects of feedback - an unpredictable
alteration of the frequency response with changes in
system gain, an increase in reverberation time, and
system instability giving rise to howl, can be reduced with
Description
There are two models, the WPG-331 and the WPG-315
and they fit standard 1U, 19” (482mm) racks. These
equalisers are housed in steel cases suitable for
mounting in professional flight cases.
Operating
Equalisation is the adjustment of the frequency
response of an audio system, regardless of level, to
add or subtract level at particular frequencies for an
improved sound. Graphic Equalizers have become an
ideal tool for control over the total audio response. In most
audio systems careful equalisation can make the
difference between a poor and a superior sound quality.
Before switching on the graphic equaliser ensure that all
the audio inputs are connected and that the mains
connections are safely and securely connected at the
supply and at the power unit.
All internal servicing must be referred to qualified
service personnel with access to technical
documentation but if the unit fails to work the user
can apply a few basic checks to locate certain
problems.
i) If the Power LED is not on:-
Check that the power switch is set to on; that the power
unit is plugged into the graphic equaliser and that the
power unit is plugged into the mains supply.
ii) If a system has been set up, and the graphic is thought
not to be functioning, please check the system
W
P
G
S
E
R
I
E
S
•
P
R
O
F
E
S
S
I
O
N
A
L
1
2
3
GROUND
+ HOT
- COLD
TIP (+ HOT )
SLEEVE/GROUND
RING (- COLD)
XLR WIRING
1/4’ STEREO
JACK WIRING
REAR PANEL DIAGRAM
WPG 315
