Cloud Electronics PS16 - Manual (Page 8)

Pump Station 16-R: Installation and operation manual 7
8 Music Inputs
The Pump Station 16-R has eight stereo line inputs; these are suitable for most music sources
such as CD players, tape players, satellite receivers and television sets etc. All the stereo
inputs are unbalanced and use RCA type phono sockets. The input impedance is 47k
Ω. Try to
plan the installation so that the length of the signal leads is as short as possible.
9 Sensitivity & Gain Control
All eight stereo line inputs have a pre-set gain control on the rear panel, adjacent to the
respective input sockets. The input sensitivity can be varied from –14dBu (155mV) to +6dBu
(1.55V). The pre-set gain controls should be set using the ‘signal’ LED so that all the input
signals operate at the same level within the mixer so that there is no perceivable change in
level when switching sources. Position the pre-set gain control in the fully anti-clockwise
position; rotate the gain control clockwise until the LED illuminates briefly on signal peaks only.
Repeat this process on the other seven inputs. Do not increase the gain control above the
suggested level as this may result in a distorted signal when the RH-8 or WP-8 volume control
is set to the maximum level position.
10 Global Input
A ‘global’ microphone/line input is provided for paging, spot announcements or evacuation
messages. The input amplifier is an electronically balanced, transformer-less design configured
for optimum low noise performance. The ‘global’ signal is routed to all the headphone amplifiers
with automatic, signal sensing priority over the music signal. The ‘global’ signal is fed into the
signal path before the VCA so that any announcement will be heard at the level set by the user.
The input impedance is 5k
Ω and is suitable for 600Ω microphones and general line level
signals. The input is via a female 3 pin XLR type connector positioned on the rear panel.
The global input is compatible with general purpose paging microphones fitted with a ‘push to
talk’ switch or open collector switching device. To open the global channel the access switching
terminals should be shorted. If the input is used with other signal sources, it will be necessary to
link pins 1 & 2 on the 4 way screw terminal to open the global input permanently.
UNBALANCED
HOT (+)
GROUND (SCREEN)
1
3
2
NO CONNECTION TO PIN 3
BALANCED
GROUND (SCREEN)
REV - PHASE (-)
IN - PHASE (+)
1 2
3
1 2 3 4
CLOSE CONTACT TO
OPEN GLOBAL INPUT
ACCESS
CONTACT
WIRING THE GLOBAL INPUT
THE GLOBAL INPUT CAN BE USED FOR BOTH MICROPHONE AND LINE SIGNALS
USE THE HIGH PASS FILTER FOR IMPROVED SPEECH CLARITY
For balanced signals, connect the cable screen to pin 1, the in-phase signal (+) to pin 2 and the
reverse phase signal (-) to pin 3.
For unbalanced signals, connect a wire link from pin 1 (ground) to pin 3 inside the XLR cable
mounted plug; use pin 1 as ground (cable screen) and pin 2 as hot.
11 Global Input Gain Control
16-07-02 V2.1
A pre-set gain control is provided adjacent to the XLR input connector, the gain can be adjusted
from 0dB to 50dB. This large variation in gain allows direct connection to a wide range of
devices from microphones to high output units (such as radio microphones), without the need
for additional attenuation. A high overload margin is maintained at all gain settings.