User manual SOUNDCRAFT K1

[. . . ] 1994 All rights reserved Parts of the design of this product may be protected by worldwide patents. Part No. ZM0088-01 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. 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. [. . . ] Ensure that all equipment racks are connected to earth, via a separate wire back to the star point. Equipment which has unbalanced inputs and outputs may need to be isolated from the rack to prevent earth loops. · · · · Installation December 1994 2. 5 Audio Wiring Having provided all equipment with power and earthing connections, consideration must be given to the method of providing audio interconnection and adequate screening of those interconnections. This must be done in a logical sequence to avoid problems and assist in the localisation of problem equipment. · Connect the Monitor system to the console and check for any hum, buzz, or RFI. Only when you are satisfied with the quietness of the console and the monitor system should you proceed with the next step. Connect stereo tape recorders, echo and foldback sends one at a time, checking and isolating any connection which degrades performance. In addition, the mains will also act as a carrier for many forms of RF interference generated by electric motors, air­conditioning units, thyristor light dimmers etc. Unless the earth system is clean, all attempts to improve hum noise levels will be futile. In extreme cases there will be no alternative but to provide a completely separate and independant `technical earth' to replace the incoming `noisy earth'. However, always consult your local electricity supply authority to ensure that safety regulations are not being infringed. Installation December 1994 2. 7 Connections Wiring conventions The K3 uses two different types of audio connector: 3-pin XLR and 1/4" 3-pole jacks. This section describes how to connect external equipment to the console. Correctly-made cables of the proper type will ensure peak performance from your mixer. GROUP & MIX OUTPUTS TALKBACK MIC MICROPHONE INPUTS 3-pole XLR 21 3 Socket(female) GROUND (SCREEN) COLD (OUT OF PHASE SIGNAL) HOT (IN PHASE SIGNAL) 1 3 2 21 3 Socket(female) GROUND GROUND Plug(male) SIGNAL / " Stereo Jack Plug used as balanced Input/Output: Hi-Z Input, Stereo Inputs, 2-Track Inputs, Matrix, Mono Output 14 Tip - HOT(IN PHASE SIGNAL) Ring - COLD(OUT OF PHASE SIGNAL) Sleeve - GROUND(SCREEN) / " Stereo Jack Plug used as a ground compensated output: Monitor Outputs, Aux Outputs, PFL Output 14 Tip - HOT(SIGNAL) Ring - GROUND SENSE Sleeve - GROUND(SCREEN) / " Stereo Jack Plug used as an unbalanced Insert: Mono, Mix and Group Inserts 14 Tip - RETURN FROM EXTERNAL DEVICE Ring - SEND TO EXTERNAL DEVICE Sleeve - GROUND(SCREEN) / " Stereo Jack Plug used as an unbalanced Output: Direct Outputs 14 Tip - SIGNAL Ring - GROUND Sleeve - GROUND(SCREEN) / " Stereo Jack Plug used as a Stereo Output: Headphones 14 Tip - LEFT SIGNAL Ring - RIGHT SIGNAL Sleeve - GROUND(SCREEN) 2. 8 December 1994 Installation Block Diagrams Mono Input Stereo Input Master Section Block Diagrams December 1994 3. 1 Mono Input Module 3. 2 December 1994 Block Diagrams Stereo Input Module Block Diagrams December 1994 3. 3 Master Section 3. 4 December 1994 Block Diagrams 4. Functional Descriptions Mono Input Module Stereo Input Module Matrix/Master Section Functional Descriptions December 1994 4. 1 1 2 3 4 5 Mono Input Channel The mono input is provided with XLR and jack connectors, either of which may be used for any level of input signal. Normally the XLR signal is used, but inserting a jack automatically disconnects the XLR socket, and applies the jack signal to the input. The channel is provided with an Insert Point using an unbalanced send and return, at a nominal level of -2dBu. The signal is accessible via a single 1/4" jack on the rear connector panel. The insert point is permanently pre-EQ. 1 The 48V switch applies 48V phantom power to the input XLR. Note that 48V is never applied to the jack socket. 6 2 The SENS (Sensitivity) control adjusts the sensitivity of both the XLR and jack inputs and in combination with the RNGE switch gives two sensitivity ranges: -15dBu to -70dBu and +10dBu to -40dBu. 3 The RNGE (Range) switch lowers the sensitivity of the input when pressed, allowing line level signals to be used. 7 4 The Ø (PHASE) switch reverses the phase of the selected input when pressed. 5 This switch inserts a second order HI-PASS FILTER into the channel path. The frequency is fixed at 100 Hz. 8 Equaliser 6 The EQ section has four bands. The HF and LF sections have a shelving response at a fixed frequency. The Hi-Mid control gives 15dB of cut or boost at 400-10kHz, selected by the Hi-Mid frequency control. The Low-Mid control gives 15dB of cut or boost at 60Hz-1. 5kHz, selected by the Low-Mid frequency control. 9 10 11 · · · 7 The EQ section is switched in by the EQ switch. [. . . ] The insert send and return are on a single 1/4" jack on the rear connector panel. 6 2 The MIX switch routes the post-fade group signal to the left and right stereo mix busses, depending on the setting of the STE switch (see below). 8 7 9 3 If STE (Stereo) is pressed, the odd-numbered group is sent to MIX Left, the even-numbered to MIX Right. If STE is not pressed, both odd and even groups are sent in mono to MIX Left and Right. 4 The AFL switch feeds the post fade group signal to the monitor/phones section where it replaces the selected monitor source. 6 5 The Group output levels are metered (post fader) by four peak-reading 12-segment LED BARGRAPHS at the top of the module; the meters are calibrated for 0 at +4dBu output. The meter response is peak-reading. 8 7 9 3 2 4 The meters can be switched to read the matrix output signal by pressing the GRP METERS TO MATRIX switch on the Master section. The group output signal is electronically balanced and is available on a male 3-pin XLR connector on the rear panel. Matrix section The matrix section provides 4 matrix outputs, each of which is a mix of the four post-fade Group signals. [. . . ]