User manual SAMSON S231

[. . . ] S Class Signal Processors DUAL 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. [. . . ] However, if the input signal is weak, use the main level slider to slightly boost the volume (to a maximum of 6 dB). Conversely, if the signal causes the front panel +18 LEDs to light, use the main level slider to attenuate volume as necessary. In normal operation, the +18 LED should not light at all; if they do, use the main level slider to lower the volume of the output signal so that it does not light at all (clipping not only sounds awful, it can also damage speakers!). Experiment by moving each of the Equalizer sliders up and down, carefully listening to the audible result on the audio signal. 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 experimenting with this control may be necessary to acheive a satisfying result. As you work with the various front panel controls, press the front panel Equalizer 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 231, 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 231 with Active Speakers In this example, the mixer's stereo output is connected to the S curve 231's inputs. Then, the S curve 231's outputs are connected to the inputs of each active (self-powered) loudspeaker. Using the S curve 231 with Passive Speakers In this example the mixer's stereo output is connected to the S curve 231's inputs. Then, the S curve 231's outputs are connected to the input of a 2-channel power amp. Next, the power amplifier's outputs are connected to the passive (non-powered) loudspeakers. 8 S curve 131 System Configurations Using the S curve 231 in Insert Points You can use the S curve 231 in your mixer's insert points if you want to equalize two mono channels individually in the mix. In this example the S curve 231'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, and the Channel 2 INPUT and OUTPUT are inserted on a keyboard channel using the same type of cable. For more information on cable wiring see the S curve 231 Wiring Guide page 15 in this manual. Using the S curve 231 for Mains and Monitors In this example, an S curve 231 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 231's Channel 1 input. Then, the S curve 231'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 AUX output is connected to the S curve 231's Channel 2 input. The S curve 231's Channel 2 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. [. . . ] 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 231 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 231 to Remove Feedback One of the most important applications for the S curve 231 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. [. . . ]