SKYTRONIC ADASTRA 900 Serie Mode D'emploi page 3

952996Manual.qxd 31/3/05
A mixer amplifier with 6 selectable microphone or line inputs and phantom power,
chime function on CH1 and VOX priority on CH1 & CH2. Provision for the connection of
100 volt line or low impedance loudspeakers. It also features a slave output and send/
return for connection of an effects unit. The amplifier can be powered from either
230Vac or a 24Vdc power source.
WARNING: DO NOT CONNECT THE MAINS SUPPLY TO THE AMPLIFIER UNTIL ALL
THE NECESSARY INPUT AND OUTPUT CONNECTIONS HAVE BEEN MADE.
C A U T I O N
RISK OF ELECTRIC SHOCK
DO NOT OPEN
WARNING: SHOCK HAZARD - DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE - NE PAS OUVRIR
WARNING: THIS APPLIANCE MUST BE EARTHED
1
CH1 CH2 CH3 CH4
CH6
L R L
6
MIC LINE MIC
PHANTOM OFF PHANTOM
FUSE T800mA/250V
GND
7
+ –
24Vdc COM 8Ω 16Ω 70V
8 9
1. Channel ( 1-6 ) volume controls.
2. Bass and treble cut & boost controls
3. Master volume control
4. Power, Signal and Peak LED indicators
5. Power ON / OFF switch
6. Fused IEC mains input socket
7. Ground terminal
8. DC ( 24volt ) Input terminal
9. Loudspeaker output terminal block
10. Low impedance ( 8 & 16Ω )
loudspeaker 6.3mm jack sockets.
11. Send / return effects 6.3mm sockets
12. Slave out RCA phono socket
LOUDSPEAKERS
All connections to the loudspeaker terminals should be made using suitable connectors
crimped or soldered to the speaker cables. Any other method can give rise to short
circuits. There is provision for 70V or 100V line and low impedance loudspeakers, but
different types must not be used on the same installation. In addition to the terminal block
there are two 6.3mm jack sockets for connection of low impedance ( 8 and 16 ohms)
loudspeakers. Low impedance speakers can be connected in series, parallel or a
series/parallel arrangement to give the correct loading. Care should be taken with this set
up in that the volume level is carefully controlled, as it is possible to damage speakers by
using too high a volume setting. 100 volt line should be connected to the COMMON and
100V terminals taking care that the sum of the wattage of all the loudspeakers on the line
does not exceed the total power available from the amplifier. NOTE: It is good practice to
allow a headroom of 10% when doing your calculations. With 100 volt line installation all
the speakers must be wired in parallel.
Please note that the loudspeaker terminals are fully floating with respect to chassis. In
the event of cross talk to other services or instability, then it may be beneficial if the COM
terminal is strapped to the earth binding post. Also note that a low impedance system
requires heavy duty cable feeding the loudspeakers to minimise losses. For a widespread
installation it is far better to use a 100 volt line system.
INPUT/OUTPUT CONNECTIONS.
Each input has both balanced ( microphone/line ) combination XLR/6.3mm and
unbalanced ( line only ) RCA phono with DIP switches for selection of microphone or line
and phantom power.
SLEEVE RING TIP
1 / " Stereo Jack Plug
4
Tip: Signal (Live)
Ring: Signal (Return)
Sleeve: Screen
9:02 am Page 3
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OPERATION MANUAL - ADASTRA 900 SERIES
2 3
PEAK
SIGNAL
CH5 CH6 BASS TREBLE MASTER POWER
0 0
-10 +10 -10 +10
15 14 13
CH5 CH4 CH3 CH2
R L R L R L R L
MIC LINE
LINE MIC LINE MIC LINE
VOX OFF
OFF PHANTOM OFF PHANTOM OFF MICROPHONE
PHANTOM OFF
MIC
VOX
CHIME
PHANTOM
8Ω SPEAKER 16Ω SPEAKER SEND RETURN SLAVE OUT
100V
11 12
10
13. Channel 1 Input.
Features: Combination XLR / 6.3mm
socket, RCA phono sockets, Terminal
block for hard wiring of microphone
& chime function, DIP switch for
selection of Mic/Line, VOX, Chime &
Phantom Power.
14. Channel 2 Input.
Features: Combination XLR / 6.3mm
socket, RCA phono sockets, DIP
switch for selection of Mic / Line,
VOX & Phantom Power
15. Channel 3-6 Inputs.
Features: Combination XLR / 6.3mm
socket, RCA phono sockets, DIP
switch for selection of Mic/Line &
Phantom Power.
PUSH
2 1
3
XLR (Balanced Operation)
Pin1 Screen
Pin2 Signal (live)
Pin3 Signal (Return)
Channel 1 has additional 3 pole screw terminal block for hard wiring a balanced
microphone. Chime activation is also provided by a DIP switch on CH 1, as well as a 2pole
terminal block. The chime is two tone ( 550Hz & 650Hz ) and has the highest priority
(Priority 1) and on activation mutes all input signals. (Note: for full priority the VOX switch
must be in the on position) The chime is activated by external switch closing.
ADDENDUM: The marking of the CHIME dip switch is incorrect. To activate the CHIME
function the switch must be in the 'OFF' position. Any further enquires please contact
our technical department.
Microphone 1 overrides CH 2-6 inputs when the VOX switch is on (Priority 2 )
Microphone 2 overrides CH 3-6 inputs when the VOX switch is in the on position (Priority 3)
SLAVE out RCA phono socket is for connection to an additional booster amplifier.
Sleeve - Screen
Pin - Signal
4
The SEND and RETURN 6.3mm sockets are for connection of an effects unit. Loudspeaker
outputs are via a screw terminal block or 6.3mm sockets.
5
A 24 volt battery can be connected using suitable connectors crimped to the battery
terminals. Observe the correct polarity. NOTE : The power switch does not control the 24V
supply to the amplifier. The mains input is a fused IEC 3 pin socket.
CH1
R
SETTING UP
LINE When all connections have been made, check that all the controls are at zero then plug
OFF
OFF
OFF
the mains lead provided into the amplifier and the 13 amp plug into a suitable 230 volt
socket. Depress the power switch on the front panel and the POWER LED illuminates.
Advance the MASTER control to 6 on its scale then using a local microphone in CH 1 input
slowly advance its volume control whilst speaking into the microphone. Observe the
SIGNAL indicator. As the control is advanced the indicator will start flashing in time with
the peaks of speech. This indicates that a signal is being passed to the loudspeakers. The
control should be set so that the peaks of sound keep the SIGNAL indicator almost
continuously lit but the PEAK LED only shows on rare occasions or not at all.Continuous
illumination of the PEAK LED indicates the amplifier is being overloaded.
If the MIC 1 control is at maximum without achieving the desired output then it will be
necessary to increase the MASTER setting a little and recommence the setting up
procedure until a satisfactory level of output is achieved.
It may be that before this setting can be achieved a howl – round (feed back) point is
reached where the system appears to become unstable, if this is the case then the
nearest loudspeaker and the microphone you are using are in each others sound fields
and need to be repositioned. If a 100 volt line system is being employed you can reset
the nearer loudspeaker to a lower wattage tap to minimise the howl-round (feed back).
The object of this setting up procedure is to balance the MASTER and MIC 1 controls so
neither are at a very low or a very high setting in relation to each other. When the initial
set up is completed try the other channels in the same way.
Most tape and CD players have additional level controls of their own which can be
usefully used to fine balance their volume levels with the LINE controls.
The bass and treble controls should initially be set to their minimum (anti-clockwise)
positions for setting up. Once this has been carried out then the tone controls can be set
for personal preference.
INTERFERENCE
Whilst this equipment complies in all respects with EMC legislation its use in an industrial
environment where there are many potential sources of interference means that steps
may need to be taken to minimise any problems. Always check that the amplifier has a
good earth. In the event of interference secure the services of a qualified electrician to
carry out tests on the socket to ensure a low resistance earth path exists.
DO NOT run microphone cables near mains, data, telephone or 100V line cables
DO NOT run 100V line cables near data, telephone or other low voltage cables.
DO NOT position the amplifier very close to large transformers, TV monitors and
computers.
AVOID jointing the microphone cable, when this is unavoidable ensure a good screened
connector is used eg. XLR.
ALWAYS use a balanced microphone terminating in a balanced input on long microphone
cable runs
ALWAYS use mains grade double insulated cable for 100V line cable runs.
3
GB
SLEEVE PIN