Audio-developments AD144 User Manual

CONTENTS SCENARIO 1 INTRODUCTION 3 UNPACKING 3 VISUAL INSPECTION 3 SPECIFIC POINTS

9 NOISE MIC <126dB 20Hz to 20kHz 200R SOURCE (WITH RESPECT TO THE INPUT) LINE <70dB SIGNAL-TO-NOISE RATIO 20Hz to 20kHz LIMITE

10 TECHNICAL SPECIFICATION - MECHANICAL AD144 is supplied with 12, 14, 16 or 18 input modules. A separate meter bridge fitted with 4 VU or PPM meters

11 SIZE DROP THROUGH VERSION OF MOUNTING 12 I/P 14 I/P 16 I/P 18 I/P A 562 623 684 745 B 568 630 690 751 C 613 674 735 796

12 EQUALISATION CURVES

13 CONNECTOR PANEL Mic/Line Module (1) Microphone input (2) Line-Level input Stereo Line Module (1) Line input left (2) Line input right Outputs

14 All inputs to, and outputs from AD144 are to be found on the connector panel. Balanced inputs and outputs are on XLRs. XLR Pin 1 Shield

15 ‘D’ connectors for METER BRIDGE and REMOTE START are as follows: CONN (20) METER BRIDGE IDC D PIN CONN. STD D PIN IDC D PIN CONN.

16 MICROPHONE/LINE MODULE (1) Phantom power toggle (2) Phase- change toggle (3) Input-gain selector (4) High-frequency amplitude (5) Mid-frequency

17 The discreet and discrete microphone amplifier is the one designed for AD146 and has been tried, tested and proved in the field

18 S-switch (23) creates a matrix amplifier across an adjacent pair of input modules. Refer to M-S NOTES. The panoramic po

1 SCENARIO Time was when it became necessary to update the ubiquitous AD145 PICO mixer. Our survey showed two main requirements: as wel

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20 STEREO LINE MODULE (1) Input-changeover toggle (2) Phase-change toggle (3) Input-balance control (4) High-frequency amplitude control (7) A

21 For optimum performance at line level, the stereo module employs RFI suppressed, double-balanced, instrumentation-grade input amplifiers. The inpu

22 OUTPUT MODULE (1) Meter 1 (3) Auxiliary output level (2) Meter 2 (4) Line-up tone to A & B (5) Matrix across A & B (6) Limiter link of A &

23 The meters are to broadcast specification with switchable functions; PPM and VU movements are available to choice. The upper met

24 ADJUSTMENTS AND CALIBRATIONS Refer to component location diagrams in TECHNICAL LIBRARY. Line-up-tone oscillator - the preset (VR1) that ad

25 Output limiters - calibration involves four presets per output; however, only two are involved with a particular parameter. Using &ap

26 MASTER MODULE (1) Line-up tone (15) Individual routeing to L&R of A,B,C & D outputs (2) Auxiliary 1 level (3) Aux

27 The master module has two transformer balanced outputs which appear on XLRs. Signals from the main group outputs A, B, C & D and the input chan

28 MASTER OUTPUT BLOCK

2 AD149 is Audio Developments' tribute to, and celebration of the genius of Alan Blumlein. We appeal to all AD149 users to break with tradition

29 (1) Auxiliary Return to Master (2) Channel to Monitor 1 (3) A Output to Monitor 1 (4)

30 AD144 monitor facilities and functions are incorporated on a single module. It is split into two sections. The first section selects (and mix

31 Monitor 2 output functions in a similar way to monitor 1 except when a channel PFL (pre-fader listen) switch is selected. In this case logic chang

32 Monitor 2 Output is on an ‘A’ type stereo jack (22) for driving headphones. This is duplicated on the connector panel. It is

33 MONITOR BLOCK DIAGRAM

34 M-S NOTES The M-S techniques proposed by Alan Blumlein in the early nineteen-thirties have recently been (re)disc

35 matrix amplifier. For any L-R stereo signal appearing on the monitor modules, DEC (15) will reveal mono capability (M) on monitor 1 le

36 Spot microphones will be panned to their correct position in the final L-R image, and may be monitored as non-destructive solo-in-place or,

37 (1) Routes A & B to Comms 1 (2) Routes C & D to Comms 1 (3) Routes Aux 1 to Comms 1 (4) Routes Aux 2 to Comms 1 (5) Routes Aux 3 to Comms

38 BLOCK DIAGRAM

3 INTRODUCTION Unpacking If there are any signs of damage to the outside of the carton, please notify us or your supplier immediately, regardless

39 This section should be read in conjunction with Pt 3 of the BLOCK DIAGRAM together with the following diagrams. The comprehensive communications m

40 The mono signal to COMM 2 is selected by an 11-way rotary switch (9) - posn 1 is a mono mix of the signal to COMM 1; posn 2 is a mono mix of the s

41 To operate the majority of external devices, it will be necessary to ‘close’ a circuit, but, for some, it will be necessary to ‘open’ the control c

42

43 DIL Switch settings Right-hand printed circuit

44 CUSTOMER NOTES AND FACTORY MODIFICATION

45 TECHNICAL LIBRARY

4 Module fix screws - Hexagon head screws are used to fix the modules and back cover. The size being 1.5mm HEX A/F with a 2.5M thread.

5 WARNING IMPORTANT SAFETY INSTRUCTIONS The user of electrical products must be familiar with their potential dangers, and fu

6 MAINS POWER SUPPLY Also refer to IMPORTANT SAFETY INSTRUCTIONS XP plc Model No AEH45UM21 The mains POWER SUPPLY UNIT is suitable for d

7 DC OUTPUT XLR CONNECTIONS Pin 1 0V Pin 2 +12V DC Pin 3 -12V DC Pin 4 NO CONNECTION Pin 5 0V NOTE: The power supply uni

8 TECHNICAL SPECIFICATION - ELECTRICAL REFERENCE 0dB = 775mV at 1kHz unless otherwise stated MAX GAIN MIC 85 75 65 55 45 35 dB LINE