User manual BEHRINGER DSP1124P

[. . . ] DSP1124P Users Manual Version 1. 0 February 2001 FEEDBACK DESTROYER PRO ® www. behringer. com ENGLISH FEEDBACK DESTROYER PRO DSP1124P SAFETY INSTRUCTIONS CAUTION: To reduce the risk of electrical shock, do not remove the cover (or back). No user serviceable parts inside; refer servicing to qualified personnel. WARNING: To reduce the risk of fire or electrical shock, do not expose this appliance to rain or moisture. This symbol, wherever it appears, alerts you to the presence of uninsulated dangerous voltage inside the enclosure - voltage that may be sufficient to constitute a risk of shock. This symbol, wherever it appears, alerts you to important operating and maintenance instructions in the accompanying literature. [. . . ] Please take the time to fill in and return the warranty card within 14 days after the date of purchase, so as to benefit from our extended warranty. Or use our online registration option available on the World Wide Web at www. behringer. com. In addition to the usual MIDI IN and MIDI OUT ports, the MIDI THRU allows you to loop through MIDI data. Please make sure that your local voltage matches the voltage indicated on the unit, before you attempt to connect and operate the unit. Blown fuses may only be replaced by fuses of the same type and rating. Some models allow for inserting the fuse holder in two different positions, in order to switch over from 230-V to 115-V operation, and vice versa. Please note that for 115-V operation outside Europe, you need to use a fuse of a higher rating (see chapter 1. 2). Use the enclosed power cord to connect the unit to the mains. 18 19 20 21 22 12 4. DSP1124P ARCHITECTURE: PRESETS, FILTERS, OPERATING MODES In order to avoid confusion, let us give you a concise description of the DSP1124Ps operating principle, so as to make the three relevant points clear right from the start. Now, you can start to purposefully produce feedback, as described in chapter 3. Depending on the room acoustics, various feedback frequencies can occur. As can be seen from table 11. 3, each of the ten presets on your DSP1124P comprises 24 separate filters, which can, however, be set to different operating modes: In our example, the first nine filters of the selected preset are set to Single-Shot mode (SI, see chapter 6. 3). This mode is designed to detect feedback frequencies at fixed resonance values, and to suppress them consistently. Their bandwidth and gain reduction can be adapted if required, however, the frequency setting remains the same. In our example, the DSP1124P is used to prevent nine fixed frequencies from making trouble. The three remaining filters (all set to Auto mode AU, see chapter 6. 3) are used to detect and suppress new feedback frequencies, which can be produced, e. g. when the singer moves around the stage with the vocal mic in his/her hand. Since the DSP1124P can by no means know whether or not the risk of feedback has been eliminated (e. g. when the singer moves to another position), the first AU filter of the unit locks to the detected frequency, while the remaining two AU filters are used to suppress any new trouble frequencies that may occur. Only when all AU filters have been used, will the first AU filter used (here: 10) be unlocked, so as to be able to detect new feedback frequencies. Basically, all active filters (both in AU or SI mode) are represented by flashing LEDs in the STATUS INDICATOR . When feedback has been detected and is being suppressed, the associated filter LED lights up constantly. [. . . ] Warranty services will be furnished only if the product is accompanied by a copy of the original retail dealers invoice. Any product deemed eligible for repair or replacement by BEHRINGER under the terms of this warranty will be repaired or replaced within 30 days of receipt of the product at BEHRINGER. If the product needs to be modified or adapted in order to comply with applicable technical or safety standards on a national or local level, in any country which is not the country for which the product was originally developed and manufactured, this modification/adaptation shall not be considered a defect in materials or workmanship. The warranty does not cover any such modification/adaptation, irrespective of whether it was carried out properly or not. [. . . ]