[. . . ] The lightning flash with arrowhead symbol, within an equilateral triangle is intended to alert the user to the presence of uninsulated , , dangerous voltage" within the product's enclosure that may be of sufficent magnitude to constitute a risk of electric shock to persons. Do not install near heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. Do not defeat the safety purpose of the polarized or the grounding-type plug. I the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. [. . . ] 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 9 dB. 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. 46 - PFL Through this button you can route the pre MON 1/2 fader signal to the headphones bus. 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 MON 1/2 bus. 47 - MON 1/2 FADER This fader controls the summed audio signal at the MON 1/2 output. When using the DIGITAL AUDIO INTERFACE as output, and the Studio routing is selected (see page 27), this fader also controls the volume of sent channels USB 1 or USB 2. 49 - MASTER LED DISPLAY The CMS offers two 12-segment LED-chains for optical monitoring the output levels of the L/R master signals. The indication range of the LED-meter is 40 dB, indicating the levels that are present at the master outputs in dBu. 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). The right LED-chain indicates the level of the summed post-fader master output. 51 - PFL Engaging the master PFL button, the pre fader mono master signal is routed to the headphones bus, so that it can be monitored via headphones output. The volume of this signal is not affected by the setting of the MASTER fader. The meter instrument in the master section is simultaneously switched, so that the left LED-chain indicates the level of the summed pre-fader L/R master signal channel (in dBu), which basically is the master bus level, while the right LED indicates the level of the summed post-fader master output. 52 - MASTER L/R FADER Level controls to adjust the output signals of the left and right master outputs (MASTER). CAUTION: Please, make sure to set the input channel faders or at least the master faders to their minimum position, or to engage the STANDBY switch, before connecting an external sound source to an input of the CMS. This will save you, your audience, and the equipment from unnecessary stress. All audio signals coming from the input channels are not output via MASTER A OUT L/R, MASTER B OUT L/ R, AUX 1/2 and MON 1/2 outputs. However, audio signals connected via 2TRACK IN or the DIGITAL AUDIO INTERFACE (see Play USB to 2TRACK on page 28) are still outputted, providing you with a very comfortable solution to play intermission music during performance breaks. [. . . ] If musical instruments are connected directly to the monaural inputs, follow the descriptions above describing the adjustment of the microphones. Make sure, that all channel faders, gain and LINE CD/USB controls of unused input channels are at their minimum setting. Establish a basic mix, using the channel faders, so that the individual sound levels relate to each other according to your personal taste. the best range for the channel faders to be set to is in the area of 5 dB to 0 dB. [. . . ]