User manual PRESONUS ACP22

[. . . ] ACP-22 Two Channel Stereo Compressor/Limiter/Gate User's Manual VERSION 1. 1 PreSonus Limited Warranty PreSonus Audio Electronics Inc. warrants this product to be free of defects in material and workmanship for a period of one year from the date of original retail purchase. To be protected by this warranty, the purchaser must complete and return the enclosed warranty card within 14 days of purchase. During the warranty period PreSonus shall, at its sole and absolute option, either repair or replace, free of charge, any product that proves to be defective on inspection by PreSonus or its authorized service representative. [. . . ] The gain control allows you to restore the loss in level due to compression. (Like readjusting the volume. ) 2. 5 Bypass & Link Bypass Activating the bypass effectively removes all processing being performed by your ACP-22 and returns the signal to unity gain. You should use bypass often when setting up your ACP-22 to compare the 'before and after' results of the signal processing effecting your audio signal. When in Bypass the Link function is interrupted and defeats the stereo link. Link When the Link button is pushed in, channel One becomes the master controller of both channels. Channel Two's controls become disabled and metering becomes summed left and right, i. e. IMPORTANT: When the two channels are linked (link button pushed in), all of channel Two's controls are inactive. Controls & Connections 2. 6 Patch Panel (Back) Input The input jacks are unbalanced tip/sleeve connectors or balanced XLR connectors. The input can handle up to +24dBu unbalanced or up to +18dBu balanced signal levels. Output The output jacks accept balanced XLR or unbalanced tip/sleeve connectors. The output will deliver up to +24dBu in signal level, balanced or unbalanced. Cable Connection Diagrams Controls & Connections +4/-10 Switch This switch adjusts the internal operating level of your ACP-22 when it is connected to line level (0dB = -10dBV) gear. With the switch in the '-10' position, the signal is raised internally so that it is processed at the lower noise floor of your ACP-22's internal circuitry. The signal level is lowered on the way out to match up with your line level gear's input. When the switch is in the '+4' position, the signal is not changed since this matches the internal operating level of your ACP-22. This function may also be useful in creating special effects with the compressor and gate of the channel by 'overcompressing' or 'gating'. Compression and Gating Sidechain The sidechain jack on each channel interrupts the signal that the compressor and/or gate is using to detect the audio signal for processing. When no connector is inserted into this jack, the input signal goes directly to the compressors control circuitry (normaled). When a connector is inserted into this jack, the signal path is broken. If you have inserted a tip-ring-sleeve connector, the input signal is sent back out of the ACP-22 via the ring of the connector. This signal can then be processed by an equalizer for example to reduce sibilance (de-essing) in a vocal track. The signal sent to the tip could also be that of a narrator or vocalist. In this application, the audio that you are passing through the compressor will automatically 'duck' when the narrator speaks or vocalist sings. Controls & Connections 2. 7Power Power Connection The power jack on your ACP-22 accepts a standard IEC cord like those found on most computers and professional recording equipment. (We can't stand them either. ) This way you can be assured of clean power combined with rugged construction that has been designed to last! Power Selection Before powering on your ACP-22 for the first time, be sure to check the position of the power selector. Make certain that the power voltage level selected matches that of your country's outlet. Power Switch I = ON, 0 = OFF. (hmmm. . . ) Controls & Connections Notes. . . Basic Setup & Applications 3. 1 Some Basic Patching Inserting into your mixers insert points, unbalanced. After your mixers main outputs, balanced. Basic Setup & Applications Between multi-track recorder inputs/outputs to mixer outputs/inputs, unbalanced. Sidechain insertion of an equalizer, for de-essinq specific frequency gating applications. Basic Setup & Applications 3. 2 Basic Applications Example setup compressing a voice or vocal track. Probably the most common use of a compressor is to limit the dynamic range of a vocalist during a live performance or a recording. It is almost always necessary to compress a vocal take during a recording session. [. . . ] Audio signals have very wide peak to average signal level ratios (sometimes referred to as dynamic range which is the difference between the loudest level and the softest level). The peak signal can cause overload in the audio recording or reproduction chain resulting in signal distortion. A compressor/limiter is a type of amplifier in which gain is dependent on the signal level passing through it. You can set the maximum level a compressor/limiter allows to pass through, thereby causing automatic gain reduction above some predetermined signal level or threshold. [. . . ]