User manual AUDIO TELEX ACM120XL

[. . . ] The Mid control allows the user to increase or decrease the amount of mids in the system. The control allows for 10dB of cut or boost at 600Hz. Depending on the speakers and application, a small cut (decrease) in the mids normally makes the system sound `warmer'. If no mid cut or boost is required, the control should be left in the centre (0) position. Treble Control The Treble control is part of a 3 band equalisation system within the ACM120XL. [. . . ] In this application, the relay output could trigger a power supply which in turn bypasses the remote attenuators. The result is that priority inputs will always be heard irrespective of the attenuator setting. The relay contacts are 0. 5 amps at 100VAC. VCA Control An external pot (500 ohm to 1K) can be connected to the ACM120XL for remote control of the master level. While a 1K pot can used, better results (smoother volume adjustment) can be obtained by using a 500 ohm pot. The external pot is governed by the master level of the amplifier allowing the installer to set the volume, then lock the amplifier 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 terminal strip on the rear panel of the amplifier. Tone Generator The ACM120XL includes a 4 tone generator module featuring Alert, Evacuate, Pre-Announce and Bell tones. All 4 tones can be activated individually using the rear panel terminal strip. Shorting "Common" to the relevant tone name will activate that particular tone. The volume level of the tone is set via an internal pot (R63) which is located to the far right (when looking from the front) of the front mixer PCB. The pot is labelled R63 and sets the level of all 4 tones. Please note that the level of the tones is not affected by the "Master" knob on the front panel. When any of the 4 tones are activated, inputs 4 to 8 are muted. Inputs 1, 2 and 3 on the other hand will mix with the tones and can be used at the same time. Insert Point The ACM120XL includes an Insert Point to allow for connection of signal processors such as equalisers, compressors or Feedback Exterminators. The Insert Point is located (electronically) between the mixer and power amplifier sections of the ACM120XL. It allows for the "mixed" output of the ACM120XL to be processed externally and then returned to the power amplifier section of the ACM120XL. The Insert Point is a 3 conductor (Tip, Ring, Sleeve) socket which accepts a standard stereo 6. 35mm (1/4") jack. The one jack allows for signals to be "sent" to the processor and then "returned" to the power amplifier. The connections are: Tip - Amplifier in. This is the return signal from the processor Ring - Mix Output. This is the signal from the mixer stage which is to be sent to the processor Sleeve - This is the ground connection. When an external processor is used via the insert point, it only affects the power amplifier section of the ACM120XL. The tape output remains unprocessed. Tape Output The ACM120XL include a tape recorder output via dual RCA connectors. Although the output signal is mono, dual RCA's are provided to allow for easy connection to domestic or professional tape recorders. [. . . ] From the factory, Input 1 has overall priority and mutes inputs 2-8 when signal is present. Input 2 has secondary priority and mutes inputs 3-8 when signal is present. Input 3 has a third level of priority and mutes inputs 4-8 when signal is present. Inputs 4-8 have no priority and are mixed. [. . . ]