AUSTRALIAN MONITOR TX8202 User manual

TX8202
8 Channel Stereo Mixer
with Direct Outputs
Operating Manual
TX8202, 8 Channel Stereo Mixer
Product Description
The TX8202 is a single rack height, 8 channel stereo mixer with direct outputs suitable for desk or 19” rack
mounting. The TX8202 has 4 balanced mic or line inputs and 4 stereo auxiliary inputs. Each input channel
has individual bass, treble and pan controls. The first 4 channels also feature a line level direct output which
can be used to feed additional amplifiers, mixers or recording devices. An internal dip switch allows the
first 4 inputs to be routed to either the direct output, the master outputs or both. The TX8202 also features
in-built VOX muting and an optional 4 tone generator with Alert, Evacuate, Pre-Announce, Bell tones and
optional remote VCA for the Master Volume.

Front Panel Features
Input Level Controls
Mic/Line Gain: The first 4 inputs are labeled Mic/Line 1 to Mic/Line 4 and should be adjusted to provide
the required mix level for each individual channel. Start with the controls set to Level 0 and turn
the controls clockwise until the desired mix level for each channel is reached. Each of the 4 inputs
is equipped with an mic/line dip switch which is located inside the unit (see Internal Adjustments).
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 1mV (for 1 Volt output).
The input sensitivity when in the line level position is 330mV (for a 1 Volt output)
Stereo Line Gain: The 4 auxiliary input channels are labeled Stereo Line 5 to 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 turn the controls clockwise until the desired mix level for each channel
is reached. The sensitivity of auxiliary inputs 5 to 8 is 180 mV (for a 1 volt output).
Master Left and Right Output
The master Left and Right 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 Control
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. Turning the pan control in a counter-clockwise direction will
send progressively more signal to the Left output channel and less to the Right output channel. The pan
control also allows the TX8202 to be used in dual zone applications.

Bass Control
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 Control
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 10 dB of treble boost @ 10KHz. Adjusting the treble
control in a counter-clockwise direction will provide up to 10 dB of treble cut @ 10KHz.
LED Display VU Meter
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 turned
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 blue LED on each the VU meters is for
indication that AC power is switched ON to the unit only.
Headphone Output Socket
A 1/4” 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 affect the headphone output level.
Power Switch & “On” LED
The black rocker switch on the right hand side of the front panel is used to switch the mixer on and off. The
‘up’ position is on. When the amplifier is connected to an appropriate AC power source and is switched on,
the blue on LED’s (located on the left side of both LED displays) will illuminate.

Rear Panel Features
AC Power Inlet
The 3 pin IEC power inlet is located on the left side of the rear panel and accepts a standard mains power
lead fitted with an IEC connector. The operating voltage is 230/240 VAC @ 50 Hz. The inlet is equipped
with an inbuilt AC fuse holder fitted with a 63mA slow blow fuse plus one spare. Power consumption is 15
VA.
Please ensure that the mains power cord is disconnected before attempting to check or
replace this fuse.
Tone Generator Terminal Strip
The TX8202 allows for an optional tone generator module to be installed. When installed 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 1 and 2. While the tone generator function is (as default)
set up to be present on both the master outputs and the direct outputs (of channels 1-6), it can be disabled
for all or any of the direct outputs via an internal dip switch (see the ‘Internal Adjustments’ section of this
manual for more details).
Left Channel and Right Output Connectors
The rear panel of the TX8202 includes two male XLR output connectors. The output is an active balanced
isolated output for connection to a power amplifier. The maximum output is 1.5V RMS. Pin connections
are Pin 1 = Earth. Pin 2 = Active Positive (+). Pin 3 = Active Negative (-). Note: If an unbalanced output
is required, use a 600 Ohm matching transformer or use only Pin 2 and Earth. Do not short any of the
active outputs to earth.
REC Output
Two RCA output connectors are included on the rear panel. These provide a line level record output from
the mixer. The record output provides a maximum of 500mV into 10K ohms making it ideal for
connection to most standard recording equipment. This output is sourced before the master gain control and
as such the record output level is not influenced by the operation of the master gain control.

Dual RCA Stereo Line Inputs
The top connectors are for the Left channel auxiliary inputs while the bottom connectors are for the Right
channel auxiliary inputs. Reading from Left to Right across the rear panel, the connections are for auxiliary
inputs 8, 7, 6 and 5.
XLR Microphone/Line Inputs
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 1mV ( for a 1 Volt output). When set to line
level, the input sensitivity is 330 mV (for a 1 Volt output). Pin connections are: pin #1-earth; pin #2-active
(high, +); pin #3-active (low, -). Phantom power of +15 volts is available on all 4 XLR inputs. An internal
phantom power ON-OFF switch is provided for each channel. The default setting is ON (See the ‘Internal
Adjustments’ section of this manual for more details).
Direct Outputs
A unique feature of the TX8202 is the individual direct output available for each of the first 4
channels. The direct outputs are accessed via balanced TRS 1/4” sockets for each channel. The
level of each output is 1 Volt (nominal). Internal jumpers (JP1) allow signal from any of the first
six channels to be disconnected from the main left/right outputs (See the ‘Internal Adjustments’ section of
this manual for more information). The direct outputs are adjustable to be pre or post the channel level
control. Factory default setting is post fader.
Vox Muting
Priority muting is provided for channels 1 and 2. Both channels have equal priority and will mute
channels 3-8 when signal is present. The muting function may be disabled by moving the jumper
labeled JP2 (located on the pcb behind the channel 8 volume control). ON and OFF positions are
clearly indicated on the pcb beside the jumper. The unit ships from the factory with muting enabled (JP2 -
OFF) – that’s right, OFF; it is a muting disable function, not a muting enable function. When channels 1
and 2 are disconnected from the main left/right outputs, the muting function is automatically disabled.