Instruction/ maintenance manual of the product 8051 AMS
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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.
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 L.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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).
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.
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.
8051 5.1 Compressor User Guide Issue 2 Page 17.
An important point after buying a device AMS 8051 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought AMS 8051 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data AMS 8051 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, AMS 8051 you will learn all the available features of the product, as well as information on its operation. The information that you get AMS 8051 will certainly help you make a decision on the purchase.
If you already are a holder of AMS 8051, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime AMS 8051.
However, one of the most important roles played by the user manual is to help in solving problems with AMS 8051. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device AMS 8051 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
