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Фрагмент инструкции
The EFFECTS SEND control should be used to optimally match the mixer EFF SEND output level to the input sensitivity of the connected external effect or signal processor. © MONITOR fader The independent monitor bus features a master MONITOR control for adjustment of the overall monitoring level. This control adjusts the output level of the overall mix derived from the input channel MONITOR controls and feeds the signal to the rear panel MON OUT jack, © STEREO L and R MASTER faders The output level of the main program signal is regulated by the MASTER faders. The regulated signal is fed directly to the rear panel LINE OUT I and R jacks and via the graphic equalizer to the rear panel SP OUT L and R jacks. 0 Graphic Equalizers For precise response shaping of the SP OUT signals, the seven-band graphic equalizers provides 12 dB of boost or cut in each band. There are seven independent linear controls at the standard ISO center frequencies of 125, 250, 500, lk, 2k, 4k, and 8k Hz peaking. © LIMITER indicator The EM2820 is equipped with a limiter circuit which limits the maximum level of the signal at SP OUT L and R to prevent the signal from distorting. The LIMITER indicator is lit when the limiter circuit is activated, © PROTECTION indicator The PROTECTION indicator lights for approximately 6 seconds after the POWER switch is pressed to indicate that the protection circuitry is operating. No sound is output at SP OUT L and R while this indicator is lit. This indicator will also light and the sound will be cut off at SP OUT L and R when the protection circuitry is activated at any other lime during the amplifier operation due to factors such as a detection of excessive DC voltage at SP OUT or a thermal overload. When the problem is corrected, the protection circuitry is automatically deactivated, the indicator goes out, and the amplifier resumes normal operation, ® POWER ON/OFF indicator When the power is ON (*»), the POWER indicator LED will be lit., 4 REAR PANEL © POWER ON/OFF switch The power switch turns the power ON or OFF. It is recommended that all fader controls be set to their lowest levels before the power is switched ON, This will prevent sudden power surges to any external equipment, 0 LINE and MIC INPUT connectors Each input channel offers a choice of two input connectors: a MIC IN connector, a balanced 4 kohm impedance XLR-3-31 connector; and a LINE IN connector, an unbalanced 10 kohm impedance 1/4" phone jack, The MIC connectors are primarily intended for use with professional low-impedance microphones or electronic instruments having low-im-pedance balanced outputs. The LINE- connectors will accept unbalanced signals from musical instruments or other such source equipment, © PHANTOM MASTER switch This switch applies built-in standard +48 V power to all MIC (XLR) input connectors for biasing Phantom powered condenser microphones. MICROPHONE CABLES AND MICROPHONE,S CONNECTION TO PREVENT HAZARD OR DAMAGE, ENSURE THAT ONLY MICROPHONE CABLES AND MICROPHONES DESIGNED TO THE IEC268-15A STANDARD ARE CONNECTED. 0 MON OUT jack This mono 1/4" phone jack (unbalanced) delivers the monitor output. This output can be used to feed the external monitor system,, The output impedance is 150 ohms and the nominal output level is +4 dB. This signal is not amplified, © ST OUT L and R jacks The EM2820 is equipped with unbalanced 1/4" phone jacks which deliver a stereo mix of the input channel signals. The ST OUT signal can be used to drive a power amplifier and speaker system, powered keyboard speakers, or a main mixing console,. Nominal output level/load impedance for the phone jack outputs is +4 dB/10 k-ohms- 5 © POWER AMP mode switch The POWER AMP switch changes the mode of the SP OUT signals. When the switch is in the STEREO position, the SP OUT L and R jacks deliver stereo signal output with 200 watt amplification into 4 ohm loads, When the switch is set to the MON (MONITOR) position, the SP OUT L jack delivers an amplified monaural L+R signal. The SP OUT R jack provides an amplified +4 dB MON signal with 150 ohm impedance. (Amplification is 200 watt into 4 ohm loads.) © SP OUT L and R jacks SP OUT 1 and SP OUT 2 are standard mono 1/4" phone jacks. The jacks are wired in parallel and, as a result, if you connect a speaker system to only one of the two jacks, then the total load impedance of the speaker system may be no less than 4 ohms. If you plug speaker systems into both of the SP OUT jacks, the total load impedance of each speaker system must be no less than 8 ohms. 9 L+R/MON mode EM2820 EM2B20 SP OUT POWER AMP Monitor Speaker Main Speaker (L+R) 6 EFF SEND jack The signal adjusted by the EFFECTS SEND control is delivered to this 1/4" phone jack (unbalanced)., Its output impedance is 150 ohms and the nominal output level is -10 dB. EFF RTN jacks The output from an external signal processing device fed by the EFF SEND output can be returned to the main program and monitor s...