Line Inputs
The TX8000 includes six dual RCA inputs (channels 1-6) for unbalanced line or aux devices such as tape
recorders, video players, tuners etc. An internal trim control is provided for each input (see the ‘Other
Internal Adjustments’ section of this manual). Dual RCA connectors are provided to allow for the simple
connection of domestic stereo devices such as tape desks and CD players. Both the left and right outputs
from these devices can be connected to the dual RCA’s and will be summed to mono within the TX8000.
Note:
Channels 1-6 of the TX8000 have both a microphone and line connection. Please note that only one
of these (on each of these channels) should be used at the same time.
Phantom Power
The microphone inputs on the TX8000 all p18v DC phantom power which is required for electret
microphones. If desired, phantom power can be defeated via an internal jumper which is located on the
output board near the line output XLR socket on the rear panel (position X3 on the output board). The
default setting is with the link in the ‘on’ position, shorting the centre pin and the pin closest to the rear of
the TX8000. To turn phantom power off, move the link to short the centre pin and the pin closest to the
front of the TX8000.
Note: It is necessary to disconnect the power cord and remove the lid from the
mixer before operating this switch.
VCA Control
An external pot (500K) can be connected to the TX8000 for remote control of the master level. The
external pot is governed by the master level of the mixer allowing the installer to set the volume, then lock
the mixer in a rack, leaving the user with just a master volume control that cannot go beyond the level set
on the master (front panel) control. Connection is via a 2 wire euro block connector on the rear panel of the
amplifier
Optional Accessories
Internal Adjustments
Note: The following adjustments involve access to the inside of the TX8000 and should
only be attempted by a qualified technician. Always turn off the AC power and remove
the AC power cord before accessing the inside of the TX8000.
Tone Generator Module
An optional ATC5488 4 tone generator board is available for the TX8000. This internally mounted PCB
can be easily fitted and plugs directly into a socket provided on the pre-amp circuit board inside the
TX8000.
The socket is located on the front board behind the input 5 level control. Please follow the
instructions supplied with the tone generator. When any tone from the ATC5488 is activated (via contact
closure) all inputs will automatically mute except for input 1. Tones available on the ATC5488 tone
generator board are:
Evacuation Tone
Alert Tone
Bell Tone
Pre Announce Chime
Muting Modules
Two optional VOX (signal activated) muting modules are available for the TX8000. The TX3010 mutes
channels 2-8 from input 1 while the TX3014 is a dual level muting module which mutes channels 2-8 from
input 1 and 3-8 from input 2. Both modules plug into a socket provided on the pre-amp circuit board inside
the TX8000. The socket is located directly behind the input 1 level control.
