User manual SOUNDCRAFT MBI SERIES 10 V2

[. . . ] SERIES 10 USER GUIDE © Soundcraft Electronics Ltd. 1992, 1993 All rights reserved Parts of the design of this product may be protected by worldwide patents. Issue 2 Part No. ZM0004 Information in this manual is subject to change without notice and does not represent a commitment on the part of the vendor. shall not be liable for any loss or damage whatsoever arising from the use of information or any error contained in this manual. [. . . ] It consists of a balanced audio input and also two contacts which may be shorted via a user-provided switch. When the switch is closed the Caller will hear a reduced programme plus the input to the External Talkback circuit (see the Applications section). 9 10 11 12 13 14 15 4 LINE (Coarse Adjust) allows the coarse adjustment of the Line input level. 5 C/F (Coarse Adjust) allows for the reduction, to a minimum, of the Caller's signal in the Clean Feed output. This is factory set and should not require further adjustment. 6 The DIVERT switch on the module is a 1-pole 2-way switch; these connections are available on the Remote socket. It is possible to connect this switch to the external telephone hybrid to enable the Caller to be diverted to, for example, a standard telephone. You will need to consult the telephone hybrid circuit's handbook for its requirements. 16 Auxiliary Send 7 The AUX control routes the Caller's signal onto the Auxiliary Mix bus. The signal may be fed to the Auxiliary control either pre-fade or post-fade. The factory default is pre-fade but this may be changed via a link on the pcb (see the Applications 28 Telco Channel section). Optional Equaliser 8 The HF EQ control provides high frequency (above 8. 5kHz) boost and cut of +/-10dB. The MF EQ control provides medium frequency boost and cut of +/-10dB at 3kHz. The LF EQ control provides low frequency (below 180Hz) boost and cut of +/-10dB. 9 When the EQ switch is depressed, the EQ section, described above, is switched into the signal path. When the switch is released the signal path bypasses the EQ section. 10 When the 80Hz switch is depressed an 80Hz high-pass filter is switched into the signal path. This control is useful for filtering-out low frequency hum. Level Control 11 The PAN control determines the position of the signal within the stereo image. Rotation fully anticlockwise feeds the signal solely to the PROGRAM MIX L bus, whilst rotation clockwise sweeps the image to the PROGRAM MIX R bus. 12 The GAIN control provides +/- 15dB gain. 13 The PEAK LED glows to give a warning of possible overload. Cueing 14 When the COMM circuit is active the Caller will hear a reduced programme plus the signal on the T/B OUTPUT bus. This bus will carry the signal from the inbuilt mic plus the signal from any of the Mono Input modules if their respective Talkback Switches are closed. In addition the Caller's input will be put on the PFL MIX L & R buses and a PFL condition is signalled on the PFL Enable bus. The Presenter will therefore hear the caller as a PFL. The LEDs in the COMM and PFL switches will glow. The COMM circuit will be deactivated when the Fader is moved away from the down position, or when the COMM switch is pushed a second time. 15 When the PFL circuit is active the Caller's input will be put onto the PFL MIX L & R buses. [. . . ] The relative levels of the left and right channels of a stereo signal. The onset of severe distortion in the signal path, usually caused by the peak signal voltage being limited by the circuit's power supply voltage. It is the ratio of the extent to which a differential amplifier will cancel noise, which is present on both inputs, compared to its ability to amplify the wanted signal. A ratio of two voltages or signal levels, expressed by the equation dB=20LOG10(V1/V2). [. . . ]