technical data
CANFORD AUDIO PLC
CROWTHER ROAD, WASHINGTON
TYNE & WEAR, NE38 OBW. UK
admin 0191 418 1000
sales 0191 418 1122
fax 0191 418 1001
02-123(Issue 3)10/94
LS300 SERIES TALKBACK LOUDSPEAKER STATIONS
27-311 TECPRO LS311T Loudspeaker station, single circuit, metal case
27-312 TECPRO LS312T Loudspeaker station, multi circuit, metal case
27-321 TECPRO LS311F Loudspeaker station, single circuit, flushmount
27-322 TECPRO LS312F Loudspeaker station, multi circuit, flushmount
27-331 TECPRO LS331 Loudspeaker station, single circuit, rackmount
27-332 TECPRO LS332 Loudspeaker station, multi circuit, rackmount
27-341 TECPRO LS311TW Loudspeaker station, single circuit, wood case
27-342 TECPRO LS312TW Loudspeaker station, multi circuit, wood case
1CONNECTING THE STATION TO THE
SYSTEM
"Loop-Through" Wiring - Two parallel wired
connectors are provided on most stations to allow
wiring to be looped through and on to the next
station if required. The female connector is used as
the input and the male connector as the output by
convention.
LS311/TandLS331Singlecircuitstations-Use2-
core screened cable and connect as shown in
diagram (1) using XLR-3 type connectors.
LS311/F Flush mount single circuit stations - For
ease of installations, these are provided with a plug
which connects to incoming wiring using screw
terminals. Wire as shown in diagram (2) using 2-
core screened cable.
LS312/F Flush mount multi-circuit stations - For
ease of installation, these are provided with a 12 pin
plugwhichconnectstoincomingwiringusingscrew
terminals. Wire as shown in diagram (3) using
multi-conductorindividuallyscreenedcableforbest
performance. Overall screened cable will work but
will suffer crosstalk between circuits when used
over larger distances.
LS312/Tand LS332Multi-circuit stations - These
are provided with 6 pin Neutrik type XLR
connectors. Up to 4 circuits can be connected.
Connect according to diagram (4) using multi-
conductor individually screened cable.
Wiring instructions for all types should be
attached to the station.
2 BASIC OPERATION
Operation varies slightly when the station is used
with built-in loudspeaker alone, headset, or plug-in
microphone.
Loudspeaker only operation
The function switch on the right of the unit is the
main operation control.
OFF - The loudspeaker is silent. The signal lamp
will still operate, to attract your attention if
required.
If a headset or accessory microphone is in use, they
are unaffected by this switch position.
LISTEN-The loudspeaker will be on, the volume
control can be used to set a suitable level.
TALK - Allows you to speak to the circuit. The
switch has a momentary action andwillspringback
to LISTEN when released. It switches off the
loudspeaker and uses it as a microphone. Tone
correction is applied to produce clear speech. You
may then speak normally so long as the switch is
pressed,andyouwillnothearthecircuitthroughthe
loudspeaker.
HEADSET OPERATION
ATecpro compatible headset wired as in diagram
(5) can be plugged into the station's front panel
socket. Internal circuitry automatically mutes the
loudspeaker when the headset is plugged in.
MIC ON/OFF - Located on the left of the Signal
Light switch, this is a latching key which activates
the headset mic to speak to the system. The
microphone amplifier gain is factory set to suit
most dynamic headset microphones. It contains a
limiter/compressor which prevents system
overload.
The volume controlnowcontrolstheheadsetlisten
level.
TALK -Still can be used to speak to the system if
requiredthroughtheloudspeaker. Inheadsetusethe
'Off/Listen/Talk'switchisnormallynotusedandhas
no affect on headset operation.
3 USE WITH ACCESSORY MICROPHONES
LSM-1 PLUG-IN GOOSENECK MICROPHONE
An LSM-1orequivalentmicrophonecanbeplugged
into the front panel socket instead of a headset.
This can convert the LS300 series station to hands-
free 2-way operation. In this case the Mic 'On/Off'
switch activates the plug-in mic. The loudspeaker
will simultaneously receive the circuit audio and is
controlled by the 'Off/Listen/Talk' switch and
volume control.
