User manual SAMSON S131MEUS

[. . . ] S Class Signal Processors 31 BAND EQUALIZER Safety Instructions Caution: To reduce the hazard of electrical shock, do not remove cover or back. Please refer all servicing to qualified personnel. WARNING: To reduce the risk of fire or electric shock, do not expose this unit to rain or moisture. The lightning flash with an arrowhead symbol within an equilateral triangle, is intended to alert the user to the presence of uninsulated "dangerous voltage" within the products enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the product. Important Safety Instructions 1. [. . . ] Bear in mind that the very lowest and highest frequency areas may have little or no effect on some signals. If there is significant low frequency noise (rumble) in the signal, engage the Low Cut switch. Starting with the Low Cut frequency control fully counter-clockwise, adjust the control so that the rumble is eliminated but the bass content of the signal still remains. Some experimentation with this control may be necessary to acheive a satisfying result. As you work with the various front panel controls, press the front panel Bypass switch in and out from time to time in order to compare the effect of the equalization curve you are creating with the original input signal. Once you've created the frequency curve required for your particular application (see the "About Equalization" section on the following pages for more information), an optional locking security cover (available from your local Samson dealer) can be placed over the front panel to make sure that your settings are not inadvertently altered. If you have followed all the steps above and are experiencing difficulties with any aspect of setting up or using your S curve 131, you can call Samson Technical Support (1-800-372-6766) between 9 AM and 5 PM EST, or contact your local distributor. 7 S curve 131 System Configurations Using the S curve 131 with Active Speakers In this example the mixer's mono output is connected to the S curve 131's input. Then, the S curve 131's output is connected to the input of the first active (self-powered) loudspeaker. The second loudspeaker is connected to the first using the first loudspeaker's extension output. Using the S curve 131 with Passive Speakers In this example the mixer's mono output is connected to the S curve 131's input. Then, the S curve 131's output is connected to the input of a 2-channel power amp running in mono "bridge" mode. Next, the power amplifier's mono output is connected to the passive (non-powered) loudspeakers. (See the owners manual for your specific power amplifier for the proper bridge mode operation. ) 8 S curve 131 System Configurations Using the S curve 131 in Insert Points You can use the S curve 131 in your mixer's insert points if you want to equalize a mono channel, individually in the mix. In this example the S curve 131's Channel 1 INPUT and OUTPUT are inserted on a bass guitar channel using a 1/4-inch TRS to 2 x 1/4-inch TS "Y" cable. For more information on cable wiring see the S Curve 131 Wiring Guide page 15 in this manual. Using the S curve 131 for Mains and Monitors In this example an individual S curve 131 is used for both the main PA speakers running a mono mix, and for the monitor mix, also in mono. For the main PA, the mixer's MONO output is connected to the S curve 131's input. Then, the S curve 131's output is connected to the input of the right main PA active (self-powered) loudspeaker. The left main PA speaker is connected by "daisy-chaining" from the right. For the monitor mix, the mixer's AUX1 output is connected to the second S curve 131's input. The S curve 131's output is connected to the input of the monitor power amplifier operating in bridge mode. Finally, the power amplifier's outputs are connected to the passive (non-powered) monitor loudspeakers. (See the owners manual for your specific power amplifier for the proper bridge mode operation. ) 9 S curve 131 System Configurations Using Two S curve 131's for Mains and Monitors 10 In this example two S curve 131's are used for the stereo main and for the 2-channel monitor mix. The mixer's left and right outputs are connected to the first pair of S curve 131's inputs for the main PA speakers. Then, the outputs are connected to the inputs of the active (self-powered) loudspeakers. [. . . ] Be prepared to compromise--and if there's a discrepancy between what the RTA says and what your own ears tell you, always go with the latter. Bear in mind that an analyzer "listening" to pink noise is no substitute for the human ear listening to actual program material. A perfectly flat frequency response is not necessarily the best sounding frequency response, so, once you have used the RTA and the S curve 131 to tune a room "by the numbers, " be sure to audition the results by playing typical audio signal (music, speech, etc. ) through your system and continue to fine tune by ear. Be prepared to compromise--and if there's a discrepancy between what the RTA says and what your own ears tell you, always go with the latter. 13 Using the S curve 131 to Remove Feedback One of the most important applications for the S curve 131 is removing feedback from an onstage monitor system. This procedure is sometimes called "ringing out, " since feedback usually begins with a slight ringing sound at the resonant frequencies where the loop between microphone and speaker is loudest. [. . . ]