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AMS 8051 manual

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Table of contents for the manual

  • Page 1

    8051 5.1 Compressor User Guide Issue 2 Issue 2 8051 5.1 Compressor User Guide © 2005 AMS Neve Ltd own the copyright of all information and drawings contained in this manual which are not to be copied or reproduced by any means or disclosed in part or whole to any third party without written permission. As part of our policy of continual product im[...]

  • Page 2

    Contents Introduction 1 Dimensions 2 Rack Mounting and Cooling 2 Power Requirements 2 Mains Supply 2 Rear Panel Connectors 3 Compressor Controls 4 LFE Filter (Filter to Channel) 4 Bypass 5 Sidechain Link 6 Sidechain Filter 6 Control Link 7 SC Trims and Threshold 8 EXT Control 9 Threshold 10 Gain Makeup 10 Ratio 10 Attack 11 Recovery 11 Gain Reducti[...]

  • Page 3

    Introduction T he 8051 is an analogue compressor that provides six transformer balanced audio paths complemented by two sidechains and a key input. Input and output to the sidechains is assignable to and from the six channels. Assignable LFE filters on the input and sidechains along with the key input provide integrated bass management. Flexible si[...]

  • Page 4

    Dimensions Units U Depth mm (inches) Height mm (inches) Approx. Weight kg (lbs) 8051 Compressor (AM4851 and AM5292) not including mains plug 3 500 (20) 135 (5.25) 10.5 (23) Rack Mounting and Cooling The rack units should be installed in a 19" cabinet with access to the front and rear. No specific air conditioning is required for the racks, pro[...]

  • Page 5

    Rear Panel Connectors - Mating connectors are not supplied with these units. CONTROL VOLTAGE I/O - 15 Pin D-Type KEY INPUT - XLR Socket INPUT 1-6 - XLR Socket OUTPUT 1-6 - XLR Plug - These connectors apply to both the Standard and Mastering Compressor (AM4851 & AM5292). - For I/O wiring on 88R(S) console mounted compressors (AM5052 & AM5265[...]

  • Page 6

    Compressor Controls LFE Filter (Filter to Channel) A 12dB/octave low-pass filter can be assigned to any one channel. This filter is applied directly to the input before the relay-bypass point, and its -3dB frequency is selectable from 80, 100 or 120Hz. 8051 5.1 Compressor User Guide Issue 2 Page 4 1 1 1 IN/OUT IN/OUT EXT A CTRL EXT B CTRL 2 2 2 3 3[...]

  • Page 7

    Bypass All channels have relay bypass. Bypass is from the output of the LFE filter to the input of the Output Level Control * . If a channel routed to a sidechain is bypassed, its connection to the sidechain is maintained. This means that other channels controlled by that sidechain are unaffected and allows a channel to control others without being[...]

  • Page 8

    Sidechain Link The sidechain link buttons route audio from each channel's sidechain audio path into one or both of the sidechain timing circuits. If a single channel's SC LINK A or B button is pressed, that channel will behave as a mono compressor. If another channel is then linked to the same sidechain, the timing circuit responds to whi[...]

  • Page 9

    Control Link While the SC link buttons control the audio inputs to each sidechain, the CV link buttons choose where the D.C. control voltage generated by each sidechain is routed. The CV link buttons also determine which gain makeup control affects each channel, in the same way that the SC link buttons assign the threshold controls. For the output [...]

  • Page 10

    SC Trims and Threshold Thresholds for each channel are determined by sidechain path gain which is applied in two stages. The two main threshold controls are first assigned to each channel with the SC Link buttons, providing a base threshold level for each of the sidechains. The SC Trim controls then allow threshold adjustment on individual channels[...]

  • Page 11

    EXT Control The EXT buttons provide an insert point in the control voltage signal, after the bias control but before routing back to the channels. During normal operation the control voltages generated by the sidechain are internally connected to the CV Link switched for routing back to the channels. In EXT mode the control voltage is taken from th[...]

  • Page 12

    Threshold Threshold is the level above which compression begins. Each channel linked to a sidechain (using the SC Link buttons) takes that sidechain's threshold. If a channel is linked to sidechains A and B the lower value of the two controls is used. The threshold controls have a range of -20dBu to +16dBu, adjustable in 2dB steps. Each channe[...]

  • Page 13

    Attack This is the time between a signal 6dB above the threshold level being applied, and the output signal falling to within 2dB of its final level. With slower attack settings compression is more dependant on the average signal level, while with faster settings it is more dependant on the peaks. Setting of 2ms, 4ms, 6ms, 8ms and 16ms are availabl[...]

  • Page 14

    Key Input A Key Input is provided to allow adjustable control from an external source. Like the sidechains the key input has a threshold level control ranging from -20 to +16 to set the intended level at which compression control is required. It can be used in several ways: q Injecting tone to provide a remotely variable base-level of compression o[...]

  • Page 15

    Mastering Compressor Controls (AM5292) The 8051 Mastering Compressor is slightly different to the standard 8051 in 2 ways: q It has 21 position detented pots for the Trim and Bias controls to aid total mechanical recall of the unit. q It has -1dB switches fitted to the Threshold and Gain Make-Up controls to allow for more accurate settings, for exa[...]

  • Page 16

    8051 Compressor - 88R(S) Console mounted AM5052 - As this unit is designed for fixed 5.1 compressor applications in an 88R(S) console the EXT A CTRL and EXT B CTRL controls are not selectable (blank buttons). 8051 5.1 Compressor User Guide Issue 2 Page 14 IN/OUT IN/OUT SC TRIMS dB 100 100 120 120 80 80 3 1/2 4 5/6 0 0 0 0 15 15 15 15 15 15 15 15 1 [...]

  • Page 17

    I/O Wiring (AM5052 & AM5265) 56 Way Free Plug Varicon Signal Signal Name Pin Number Hi Lo Scn 1 1 Left Input C J D 2 3 Centre Input P V K 3 2 Right Input U Z d 4 4 S Input Y c f 5 5 LS Input s m j 6 6 RS Input x t n 7 1 Left Output CC y JJ 8 3 Centre Output MM HH NN 9 2 Right Output B F A 10 4 S Output L R E 11 5 LS Output S W a 12 6 RS Output [...]

  • Page 18

    Specifications I/O The key input and LFE filter inputs are electronically balanced with an input impedance of 10kohms. All other inputs are transformer balanced with 3.6kohms input impedances. All outputs are electronically balanced post the output transformers, with maximum output of +26dBu into 600ohms. The unit is calibrated for bridging loads g[...]

  • Page 19

    8051 5.1 Compressor User Guide Issue 2 Page 17[...]