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Фрагмент инструкции
38. AUX3/4 POST As already previously described, this switch allows determining whether Pre- or Post-Fader signals are present at the AUX3/4 channel. The corresponding yellow LED signals when the switch is engaged and all input channel AUX3/4 controls are assigned post fader. 39. FEEDBACK FILTER The feedback filter is a very narrow banded notch filter, which is only active in a range that is extremely susceptible for acoustical feedback. The FEEDBACK filter rotary control sets the corresponding frequency range. Pressing the corresponding button activates the filter. Several circumstances and conditions have an influence on how sensitive or insensitive your system is for acoustical feedback. The following notes are meant to assist you in avoiding feedback and you should take them into consideration even before you activate the feedback filter: 1. Do not position the main speaker systems behind the microphones. 2. Switch off all microphones that are not in use. 3. Consider the microphones’ different polar patterns and characteristics, when placing the monitor speakers. 4. Do not turn up the monitor system’s volume higher than actually necessary. 5. Try to avoid extensive equalization on channels that you want to include in your monitor mix. 6. Keep in mind, that a microphone “behaves” different when somebody stands right in front of it. 7. Position the microphones as direct as possible to the sound source. If you still have the feeling that the monitor system’s acoustic output is not sufficient, after considering the above mentioned precautions, you can use the FEEDBACK filter to mute the frequency that tends to generate feedback the most. Therefore, you have to perform the following steps: Increase the AUX3/4 (monitor) level until the limit is reached where feedback starts. The slightly “hovering” sound that you hear is generated by the system itself. Switch on the feedback filter, turn the rotary control and set it at the mark where the “sound” disappears. Switching the filter on and off lets you easily check whether you tuned in the correct frequency. The feedback filter attenuates the level of the corresponding frequency band by about 9dB. Since the filtered band is extremely narrow, an alteration in the sound of your monitor system is hardly audible. Caution: Please be extremely careful in driving the system just below the feedback limit. Careless operation, resulting in feedback noise at high SPL, can cause severe damage to your speaker systems and – even more important – the human ear. 40. MUTE The MUTE button mutes the Aux-Send output signal. PFL signals are not affected. 41. PFL Through this button you can route the pre AUX3/4 fader signal to the headphones bus. The signal is outputted for listening via the headphones output. The setting of the AUX3/4 fader is not relevant for the signal’s volume (PRE FADER LISTEN). The meter instrument in the master section is simultaneously switched, so that the left LED-chain indicates the level of the actually chosen channel (in dBu), leaving you with the opportunity for adjusting the level without routing it to the AUX3/4 SEND bus. MASTER 42. AUX3/4 VOLUME This fader controls the summed audio signal at the AUX3/4 SEND output. When used for monitoring, this fader lets you control the volume of the monitor system. 43. 7-BAND EQUALIZER Left and right master channels employ a 7-band equalizer, which gets activated through the use of the EQ ON button. The EQ’s insert point is post master fader and pre power amplifier. The EQ is bypassed when the EQ ON switch is not locked in its “ON” position. Seven frequency bands offering 10 dB amplification/attenuation and a quality of Q=2 allow shaping the overall sound to meet your personal preferences or to optimally match it to the acoustic conditions of different locations. The frequency ranges as well as the characteristics of the EQ faders are very praxis-oriented. In case you want to have a clear and highly intelligible sound, which, as a side effect, provides the cymbals with more crisp, you should raise the levels of the 12kHz or 6kHz band a bit. If the MIDs are nasaling you should attenuate the mid range by some decibels. To provide the kick drum with more punch you have to boost the low frequency range, using the 63Hz or the 125Hz controls. In case the overall sound is undefined with too much bass, lowering the levels of these two frequency bands will solve the problem. However, especially with equalization you should be aware of the fact that in most cases less adjustments provide better results. Thus, your first choice should be to establish the mix using only the input channel controls and see if you get a satisfactory result. If so, you can use the graphic EQ for the AUX3/4 or the MONO bus, where in most cases, especially when used for the monitoring, it is more needed. You will find the description of how to include the graphic EQ in these buses in the following explanation of the MASTER PATCHBAY. 44. STATUS INDIC...