User manual NADY FS-4N

[. . . ] · 1/4" TRS balanced jacks for both SIGNAL IN and OUT · Internal shielded power supply with external fuse and ~115V (60Hz) / ~230V (50Hz) AC select switch · IEC power cord socket for AC operation and screw terminals for optional +24 VDC input powering 2 CONTENTS FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 CONTROLS AND CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 TYPICAL SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] Care should be taken so that objects do not fall into, and liquids are not spilled through, the enclosure's openings. The product should be serviced by qualified service personnel when: A. The power supply cord or the plug has been damaged; or B. Objects have fallen into, or liquid has been spilled onto the product; or C. The product has been exposed to rain; or D. The product does not appear to operate normally or exhibits a marked change in performance; or E. The product has been dropped, or the enclosure damaged. Do not attempt to service the product beyond what is described in the user-maintenance instructions. All other servicing should be referred to qualified service personnel. 5. 10. 11. 4 CONTROLS AND CONNECTIONS FRONT PANEL 5 4 3 2 1 1. POWER SWITCH To turn the unit ON or OFF, press the upper or lower portion of this button. POWER LED INDICATOR This LED illuminates when the power is turned "ON". AUDIO SPECTRUM ANALYZER DISPLAY This in-line 8-band audio spectrum analyzer enables quick identification of the frequency range of any problem frequency and allows monitoring of the amount of reduction selected in any of the notches. The display monitors both the input and output levels as selected by the Bypass switch (5). It monitors the output when the switch is IN (down), and the input when the switch is OUT (up) for bypass mode. The audio spectrum display has a range of 25Hz to 16 KHz in 8 frequency bands, with 6 LEDs in each tree indicating levels from +3 to ­20dB. NOTCH FILTERS Use these notch filters to control up to four different feedback (howling or screeching resonances) frequencies independently. FREQUENCY SELECT CONTROL Adjust the desired suppression frequency for each notch independently with this control. The filters are extremely narrow (1/60 octave) so take care in properly tuning out the desired feedback. SCALE FREQUENCY MULTIPLIER SWITCH Use this switch to select either X1 (up) or X10 (down) multiplier of the frequency scale on the Frequency Select Control as needed to "tune in" on the desired suppression frequency. [. . . ] CAUTION: DO NOT REMOVE THE CENTER GROUNDING PIN. AC VOLTAGE SELECTOR SWITCH Before plugging in the power cord, check to see that the unit is set for the proper voltage for your area: ~115V (60Hz) or ~230V (50Hz). 6 TYPICAL SETUP The FS-4N Feedback Suppressor is typically connected between the mixer and other effects or processors and/or the power amplifier in live sound applications. The entire audio in a given setup should feed through the FS-4N so that you may control all hum, noises and feedback appearing anywhere in the signal you are amplifying. Since both monitor (if used) and FOH (Front-of-House) amplification may cause feedback, it may be necessary to suppress frequencies in each loop. [. . . ]