AUDIO TELEX TX8201 User manual

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TX8201
8 Channel Stereo Mixer
with 6 Direct Outputs
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Audio Telex Communications Pty Ltd
ACN 001345482 lncorporated in NSW
NSW & ACT QLD & NT vtc
149 Beaconsfield Street
Private Bag 149
Silverwater NSW 2128
Australia
Ph 02 9il714',1
Fax [phone]
42 CommercialRoad
PO Box 871
Fortitude Valley QLD 4006
Ph 07 38521312
Fax [phone]
221277 Middleborough Road
Box HillVlC 3128
PO Box 151
Blackburn South VIC 3130
Ph 03 9890 7477
Fax [phone]
WA SA TAS
299 Fitzgerald Street
West Perth WA 6005
PO Box 404
North Perth WA 6906
Ph 08 92284222
Fax [phone]
Electronic Concepts Pty Ltd
76 George Street
Thebarton SA 5031
PO Box 7034 Hutt Street
Adelaide SA 5000
Ph 08 82349444
Fax [phone]tr.1
K W McCulloch Pty Ltd
54a Albert Road
MoonahTAS 7009
Ph 03 6228 6373
Fax [phone]
New Zealand
Unit B, 11 Piermark Drive
PO Box 512
Albany NZ 1331
Ph 09 4159426
Fax [phone]il

TX8201 Stereo Mixer with Direct Outputs
Product Description
The TX8201 is a single rack height, 8 channel stereo mixer suitable for desk or 19" rack mounting. The TX820l has 6
balanced microphone or line inputs and 2 stereo auxiliary inputs. Each input channel has individual bass, treble and pan controls. The
first 6 channels feature a line level direct output which can be used to feed additional amplifiers, mixers or recording devices. An
internal jumper allows the first 6 inputs to be removed from the master lefl/right outputs while still retaining their direct output
function. The TX8201 features in-built VOX muting and a4 tone generator with Alert, Evacuate, Pre-Announce and Bell tones.
Front Panel Controls
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MiC/Line Gain: The first 6 inputs are labeled Mic.Line I to Mic.Line 6 respectively and should be adjusted to provide the required
mix level for each individual channel. Start with the controls set to Level 0 and tum the controls clockwise until the desired mix level
for each channel is reached. Each of the 6 inputs is equipped with a mic/line selector dip switch which is located inside the unit (see the
'Internal Adjustments' section of this manual for more details). Please ensure that this switch is in the correct position for the type of
input (mic or line) that you are connecting to each channel. The input sensitivity when in the mic level position is lmV (for a I Volt
output). The input sensitivity when in the line level position is 330mV (for a I Volt output)
StefeO Line Gain: The 2 auxiliary input channels are labeled Stereo Line 7 and Stereo Line 8. These controls should be adjusted
to provide the required mix level for each individual auxiliary channel. Start with the controls set to Level 0 and tum the controls
clockwise until the desired mix level for each channel is reached. The sensitivity of auxiliary inputs 7 and 8 is 180 mV (for a I volt
output).
Mastef Left & Right Output The master Left and fught controls should be adjusted to set the overall mixer level for each
output channel based on the individual levels already set via the input channel gain controls. Start with the output controls set at
approximately the Level 5 position and adjust clockwise for more output level or counter-clockwise for less output level.
Pan COntlOl: Each input channel has a recessed (screwdriver adjustable) pan control. The pan control determines what proportion
of each input channel will be sent to either of the Left or Right output channels. Setting the pan control in the centre position will send
equal signal levels to both the Left and Right master outputs. Turning the pan control in a clockwise direction will send progressively
more signal to the Right output channel and less to the Left output channel. Tuming the pan control in a counter-clockwise direction
will send progressively more signal to the Left output channel and less to the fught output channel. The pan control allows the TX820l
to be used in dual zone applications.
BaSS TOnal COntfOl: Each input channel has a recessed (screwdriver adjustable) bass tonal adjustment control labeled "Bass".
Setting this control in the centre position will give a flat bass response. Adjusting the bass control in a clockwise direction will provide
up to 12 dB of bass boost @ 100 Hz. Adjusting the bass control in a counter-clockwise direction will provide up to 12 dB of bass cut @
100 Hz.
Treble TOnal COntfOl: Each input channel has a recessed (screwdriver adjustable) treble tonal adjustment control labeled
"Treble". Setting this control in the centre position will give a flat treble response. Adjusting the treble control in a clockwise direction
will provide up to l0 dB of treble boost @ lOK Hz. Adjusting the treble control in a counter-clockwise direction will provide up to 10
dB of treble cut @ lOK Hz.

VU Metef: An 8 segment LED VU meter is provided for each of the master Left and Right outputs. The VU meters indicate output
signal level from -21 to +3 dB. For normal operation the LED's should rarely oscillate in the red zone. If the LED's in the red zone are
lit continually, then the output level controls should be tumed counter-clockwise to reduce the output level. Too much output level can
cause signal distortion and a mismatch with the device that the mixer is driving. The far left, amber LED on each the VU meters is for
indication that AC power is switched ON to the unit only.
Headphone Output Socket A 714- TRS stereo socket is provided for the connection of monitor headphones. The output
level to the headphones is a nominal 3 volts @ 600 ohms and is connected before the master output level controls. Adjusting the master
output level controls will not effect the headphone output level.
POWef SWitCh: A rocker switch turns AC mains power ON and OFF to the TX820l. A power ON state is indicated by the amber
LED on each of the VU meters.
Rear Panel
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3 Pin IEC AC Mains Power lnlet. The operating voltage is 240 VAC @ 50 Hz or ll0 VAC @ 60 Hz. The AC power
voltage level is not externally user adjustable but is factory pre-set. The inlet is equipped with an in-built AC fuse holder fitted with a 1
Amp fuse plus a spare. Power consumption is 15 VA. I Please ensure that the mains power cord is disconnected before
attempting to check or replace this fuse.
Tone Generator Barrier Strip. The TX820l includes a four tone generator module. The tones available include Alert,
Evacuate, Pre-Announce and Bell. The four tones may be activated via a simple contact closure. To activate a tone, just short out the
common terminal with the terminal labeled with the tone that you want to use. When activated, any of the four tones will mute all
inputs except for channels I and2. While the tone generator function is (as default) set up to be present on both the master outputs and
the direct outputs (of channels l-6), it can be disabled for all or any of the direct outputs via an internal dip switch (see the 'Intemal
Adjustments' section of this manual for more details). A trim pot (R104), which is located on the pcb behind the left channel master
output, may be adjusted to vary the level oftone generator output.
Left Channel Output Gonnection rnis is an active balanced XLR connection with a nominal level of I volts @ 600 ohms.
The pin connections are; pin #l-earth; pin#Z-active (high, +); pin #3-active (low, -).
Right Channel Output Connectiofi. This is an active balanced XLR connection with a nominal level of I volts @ 600
ohms. The pin connections are; pin #1-earth; pin #2-active (high, +;; pin #3-active (low, -).
Dual RCA Sockets For Output To A Stereo Tape Recorder. Nominal 500mV @ llKohms. The top connector
is the left channel output while the bottom connector is the right channel output. The tape outputs are connected before the master Left
& Right output level controls so the tape output level is not affected by adjustments to the master level controls.
Dual RCA Sockets For The 2 Stereo Auxiliary lnputs. The top connectors are for the Left channel auxiliary inputs
while the bottom connectors are for the fught channel auxiliary inputs. Reading from Left to Right across the rear panel, the
connections are for auxiliary inputs 8 and 7.
6 Active Balanced XLR Sockets For Microphone or Line lnputs. Each XLR input is switchable to be either
balanced mic or line (via an internal dip switch, the location and setting of which is explained in the 'Internal Adjustments' section of
this manual). When set to mic level, the mic input sensitivity is lmV ( for a I Volt output). When set to line level, the input sensitivity
is 330 mV (for a 1 Volt output). Pin connections are: pin #l-earth; pin#2-active (high, +;; pin #3-active (low, -). Phantom power of +15
volts is available on all 6 XLR inputs. An intemal phantom power ON-OFF switch is provided for each channel. The default setting is

ON (See the 'Intemal Adjustrnents' section of this manual for more details). Reading from left to right across the rear panel, th
connection for the XLR mic/line inputs are 6, 5,4,3,2, & I respectively.
Direct Outputs. A unique feature of the TX820l is the individual direct output available for each of the first 6 channels. Th
direct outputs are accessed via balanced TRS l/4" sockets for each channel. The level of each output is 1 Volt (nominal). lntemr
jumpers (JPl) allow signal from any of the fust six channels to be disconnected from the main leff/right oueuts (See the'Intemi
Adjustments' section of this manual for more information).
VOX MUtin$. Priority muting is provided for channels I and2. Both channels have equal priority and will mute channels 3-8 whe
signal is present. The muting function may be disabled by moving the jumper labeled JP2 (located on the pcb behind the channel
volume control). ON and OFF positions are clearly indicated on the pcb beside the jumper. The unit ships from the factory with mutin
enabled (JP2 -OFF) - that's right, OFF; it is a muting disable function, not a muting enable frrnction. When channels I and 2 ar
disconnected from the main leff/right ouputs, the muting frrnction is automatically disabled.
TOng GgngfatOf. A four tone generator is built into the TX820l. The tones available are Alert, Evacuate, Pre-Announce an
Bell. All four tones can be activated individually via rear panel contact closures. All tones mute channels 3-8. Tones can be disable
from the direct outputs via an internal dip switch (See the 'Internal Adjustnents' section of this manual for more information). A trir
pot (R104) which is located on the board behind the left channel master output may be adjusted to vary the level of tone generatc
output.
lnternal Adjustments
g The following adjustments involve access to the inside of the TX8201. Adjustment should only be attempted by
qualifred technician. Always turn offthe AC power and remove the AC power cord before attempting to access the inside of th
TX820r
Master Left/Right and Direct Out Assignment. A jumper labeled JPI is provided for each of the first 6 channels. Th
jumpers are lqcated near the front of the unit. When in the ON position, signal from that channel is fed to both the master outputs an
the direct outputs. When the switch is in the OFF position, signal from that channel is fed to the direct line level output only.
Mic/Line Switch for Channels 1-6. A four position dip switch is located on the main board behind each input. To ser
channel for microphone level, set switches I ard2 (MIC) to the ON position. To set a channel for line level, set switches I and 2 to th
OFF position. The unit ships from the faciory set to mic level.
Tone Generator to Direct Output Defeat Switch. Sigrral from the tone generator can be removed from each direc
output via switch # 4 (TG) on the internal dip switch per channel. When in the ON position, the tones (when activated) are fed to th
corresponding direct output as well as the master Lefl/Right outputs. When the switch #4 is set to the OFF position, the tones are onl
present at the Master I€ft/Right outputs. A trim pot (R104) which is located on the board behind the left channel master ouput may b
adjusted to vary the level oftone generator output.
Phantom Power Defeat Each of the )(LR inputs has access to +l5v DC phantom power. Phantom power is selected vi
switch # 3 (PP) on the internal dip switches mentioned above. When switch # 3 is in the ON position, +l5v phantom power is availabl
on the XLR input. Care should be taken to disable phantom power before connecting any unbalanced or line source. The factory defau)
position is with phantom power set to the ON position.
MUting Defeat. The muting firnction can be disabled by moving the jumper labeled JP2 (located behind channel 8 volum
control). In the ON position muting is disabled, in the OFF position muting is enabled (go figure!). The unit ships from the factory wit
muting enabled, ie the jumper is set to the OFF position. When channels I and 2 are removed from the main leff/right output, th
muting frrnction is automatically disabled.
Looking for something worthy to connect to the inputs and outputs of your new TX8201? Well, please call you
nearest Audio Telex Communications office for referral to your closest authorised dealer or for more informatiot
on the full selection of our compatible sound system products.