User manual SOUNDCRAFT MBI SERIES 20 V1

[. . . ] No part of this manual may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, electrical, mechanical, optical, chemical, including photocopying and recording, for any purpose without the express written permission of Soundcraft Electronics Ltd. It is recommended that all maintenance and service on the product should be carried out by Soundcraft Electronics Ltd. cannot accept any liability whatsoever for any loss or damage caused by service, maintenance or repair by unauthorised personnel. Soundcraft Electronics Ltd. Cranborne House, Cranborne Road, Cranborne Industrial Estate, Potters Bar, Herts. , England. [. . . ] There is a microswitch attached to the Fader which detects when it is in the fully down position. This microswitch helps to control many of the features which are described in this section. The input to the channel will be on-air whenever the Fader is open (unless the cough switch is closed). Note: Each Mono Input channel can be configured as a Local or Distant channel. This controls which monitor circuit will be muted when the channel's Fader is opened and the mic is selected. Specifications Microphone Input Electronically balanced Input Impedance Maximum I/P level Sensitivity Range CMRR EIN Line Input Electronically balanced Input Impedance Input Range Equalisation LF MF HF General Insert Send Level THD >20k -10dBu to 0dBu >1. 5k -2dBu -70dBu to -23dBu >100dB @70dB gain -128dB, 200R source +/- 10dB shelving at 180Hz 10dB cut and boost at 3kHz +/-10dB shelving at 8. 5kHz -6dBu 0. 006% @1kHz 0dBu 26 Mono Input Channel Telco Channel Description & Operation Specification Telco Channel 27 7HOFR&KDQQHO 1 Input Stage 2 The Telco module must be connected to the telephone system via a telephone hybrid circuit. The Applications section of this manual gives more details. 3 1 The LINE input is a female XLR into which the output from an external telephone hybrid may be plugged. 2 The C/F (Clean Feed) output is a male XLR connector which may be plugged into the input of an external telephone hybrid. The Clean Feed signal (also known as Mix Minus) is the programme output signal minus the phone signal. 3 REMOTES Socket This 25-way D-type female connector allows you to implement the following facilities: Telephone Divert See Divert Switch. 4 5 6 7 8 Talkback Enable This user-provided switch will, when closed, cause the Caller to hear a reduced programme output plus the signal on the T/B OUTPUT bus. This bus will have the signal from the inbuilt mic plus the signal from any of the Mono Input modules if their respective Talkback Switches are closed (see the Applications section). External Talkback This allows the Producer to talk to the Caller. The Presenter will therefore hear the caller as a PFL. The PFL circuit will be deactivated when the Fader is moved away from the down position. Output To The Programme 16 The smooth-action, 100mm FADER gives a gain of unity (0dB) when it is in the fully up position. The scale alongside the Fader indicates the attenuation, in dB, for any position. There is a microswitch attached to the Fader which detects when the Fader is in the fully down position. This microswitch helps to control many of the features which are described in this section. The input to the channel will be on-air whenever the Fader is up (unless the Divert Telco Channel 29 switch is depressed and is properly connected to the Hybrid). 30 Telco Channel Stereo Input Channel Description & Operation Specification Stereo Input Channel 31 6WHUHR, QSXW&KDQQHO 1 Input Stage 1 The LINE 2 (LEFT and RIGHT) female XLR connectors provide for an alternative or temporary source. The inputs are electronically balanced. 2 2 The LINE 1 + REMOTES 25-way D-type female socket provides the connections for the Line 1 Inputs and also the remote controls for Line 1 and Line 2 inputs. The inputs are electronically balanced. The remote controls, which are duplicated for both Line 1 and Line 2, are described below. Only one of the two Start relays (Line 1 Start or Line 2 Start) will be active at any time, depending upon the setting of the LINE 2 switch. The two Stop/Re-cue relays are controlled similarly. Start Relay The contacts of this relay will close when the STRT switch is depressed and the Fader is up, or it will close when the PFL switch and the STRT switches are depressed. [. . . ] When the switch is depressed the meters will follow the Control-room Monitor. A red LED in the switch glows to indicate that the Meters are following the Control-room Monitor. Note: The Meters will follow the Monitor even if talkback to the Control-room is used, i. e. the meters will not follow the talkback signal. 44 Monitor Section Appendices Glossary Dimensions Warranty Appendices 45 Glossary Attenuation Balance Clipping The reduction of a signal level. The attenuation is usually measured in dB. [. . . ]