User manual AUSTRALIAN MONITOR TX8000

[. . . ] If no bass cut or boost is required, the control should be left in the centre (0) position. Treble Control Each channel has a recessed, screwdriver adjustable Treble control which forms part of a 2 band equalisation system for each input. The Treble control allows the user to increase or decrease the amount of treble for that particular input. The control allows for 9dB of cut or boost at 10kHz. Generally, a small increase of the treble control makes a system sound `brighter'. [. . . ] The tape output provides a maximum of 700mV into 10K ohms making it ideal for connection to most standard tape recorders. This output is sourced before the master gain control and as such the tape output level is not influenced by the operation of the master gain control. Microphone Inputs The TX8000 includes eight female XLR inputs which accept 200 ohm balanced or unbalanced microphones. An internal trim control is provided for each input (see the `Other Internal Adjustments' section of this manual). Phantom power of +18v DC (internally defeatable) is provided. 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 provide +18v 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. [. . . ] Do not block fan intake or exhaust ports. Do not operate equipment on a surface or in an environment which may impede the normal flow of air around the unit, such as a bed, rug, weathersheet, carpet, or completely enclosed rack. If the unit is used in an extremely dusty or smoky environment, the unit should be periodically "blown free" of foreign matter. Removing the cover will expose you to potentially dangerous voltages. [. . . ]