User manual AUDIO TELEX ACM250

[. . . ] Adjusting the mid control in a counter-clockwise direction will provide up to -12 dB of mid cttt @ 600 Hz. Tfeble COntfOl: Setting this control in the centre position will give an overall flat treble response. Adjusting the treble control in a clockwise direction will provide up to 9 dB of treble boost @ 10kHz. Adjusting the treble control in a counter-clockwise direction will provide up to -9 dB of treble cuI @ l0kJ1z. MaStef OUtpUt COntrOl: This conhols the overall output level of the amplifier depending on the levels set for the individual input channels as detailed above. [. . . ] TheACpowervolrage Direct Output Terminal Strip: The screw terminals on the left hand side of the strip allow access to the direct speaker outputs of the amplifier. The screw terminals on the right hand side are for activation of the in-built 4 tone generator. Reading from left to right the terminals are: o Low Impedance Common (use with 4 ohms) o 'r t r t o o o o o 4 Ohms Spare Constant Voltage Common (use with 70v or 100v) 70 Volt Line 100 Volt Line Spare Tone Generator Common (use with one of the 4 tones listed below) Pre-Announce Chime Alert Tone Bell Chime Evacuation Tone 100 Note: The minimum impedance (or maximum load) at Volt line should be no less than 40 Ohms. Phantom Power Button: This button enables or disables the 18 volts DC phantom power which is available on all microphone inputs (XLR's). The "in" position indicates that phantom power is on for all mics. The "out" position means that phantom power is switched off for all mics. Phantom power is required for electret condenser microphones which require DC power to operate. While some of these microphones can operate from an internal battery, having phantom power available on the amplifier eliminates the need to regularly change batteries in the microphone. While phantom power is not required for the more common Dyramic microphones, it will not damage them providing that they are balanced. Do not plug an unbalanced microphone in any amplifier or mixer when phantom power is switched on. Line Output The balanced XLR line level output provides a maximum of 700mV to allow for connection to up to 6 power amplifiers. Simply run a balanced cable from the line out of the ACM250 to the line input of the power amplifier. Pin conaections are: pin #l-earttr; pin #2-signal (high, +); pin #3-signal (low, -). Tape OutpUt RCA style phono output corulectors provide a line level output with a maximum of 350mV into 1 0K Ohms which is ideal for a 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. Active Balanced, XLR Sockets For The Microphone lnputs. The mic input sensitivity is lmV @ 200 ohms. Pin connections are: pin #l-earth; pin #2-signal (high, +); pin #3-signal (low, -). Phantom power of +18 volts is available on all microphone inputs. Reading from left to right across the rear panel, the connection are for microphone inputs 6, 5, 4, 3, 2, & 1 respectively. Line inputs 1, 2, 3, 4, & 5 have an input sensitivity of 75mV 47K ohms. Input 6 has an input sensitivity of 300mV @ 47K ohms making it suitable for high level inputs such as a CD player. @ Reading from left to right across the rear panel, the connections are for inputs 6, 5, 4, 3, 2, & I respectively. RCA Sockets For The Monaural Line Level Inputs. Other Features tones are available from the in-built tone generator board. [. . . ] VOX muting is available from channels I and 2 meaning that any signal on channels I and2 (mic or line) will mute channels 3, 4, 5 & 6. The muted channels will automatically ramp back up to normal volume when the signal on channels 1 and/or 2 is no longer active. The amplifier ships with the VOX muting function enabled. [. . . ]