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Фрагмент инструкции
Next remove the 315 ma. fuse and install the 160 ma. fuse (found in the bag marked European) and then place the holder back in the power receptical. 1.8 Fuse Rep icemen t If the fuse needs replacement, it must be replaced by one of the same type and rating for the power connections being used. See below: 315mA/250V NB (115 Vac line) 160mA/250V NB (230 Vac line) 2 INSTALLATION 2.1 Rack Mounting The EQ-215 may be installed in a standard 19 inch equipment rack. It requires 1 3/4 inches of vertical rack space and mounting is accomplished by using the four rack mount screws provided. 2.2 Ventilation The EQ-215 must be adequately ventilated to avoid excessive temperature rise. It should not be used in areas where the ambient temperature exceeds 50°C (122°F). To determine the ambient air temperature, operate the system in the rack until the temperature stabilizes. Measure the ambient air with a bulb-type thermometer held at the bottom of the upper-most unit. Do not let the thermometer touch the metal chassis because the chassis will be hotter than the ambient air. If the temperature exceeds 50°C (122°F), the equipment should be spaced at least 13/4 inches apart or a blower installed to provide sufficient air movement within the cabinet. WARNING: Do not operate the equalizer within a completely closed, unventilated housing. 3 SIGNAL CONNECTIONS (Both Channels) 8.1 Input Connections Balanced input connections may be made to either the XLR female connector or the balanced phone jack. For single-ended inputs, strap pins 1 and 3 on the XLR connector or when using the balanced phone jack, strap the ring to the sleeve. Refer to Figure 1 for typical input connections. 8.2 Output Connections Output connections are made to either the XLR male connector or the single circuit phone jack. For balanced output use the XLR connector. For unbalanced output use the phone jack. Refer to Figure 2 for typical output connections. 4 OPERATION 4.1 Front and Rear Panel Controls FRONT PANEL ® BOOST/CUT slider controls for frequency bands. © PEAK. Peak indicator. ® LEVEL. Output level control. ® LO-CUT. Bass cut switch. ® EQ ON. Equalizer on/off switch. ® RANGE. Boost/Cut range switch. ® ON/OFF. Power switch. REAR PANEL ® Electronically balanced inputs. ® Balanced/Unbalanced outputs. • Ground-Lift-Switch. ® Fuse holder/ac line voltage selector. 4.2 BOOST/CUT Slider Adjustments The primary tones of the bass drum, bass tuba, electric and acoustic bass guitar and the organ pedal clavier are affected mostly by the frequency bands 25 Hz through 100 Hz. In special cases the 63 Hz band can be used to filter out line hum (setting slider to max cut). To modify lower vocals, drum fundamentals, upper bass, and lower bass instruments such as tuba and trombone use the frequency bands 100 Hz through 250 Hz. The 250 Hz band can be used for a slight boost, giving vocals added fullness where a degree of additional support is desired. Electro-Voice • a Mark IV Company 1 Installation and Operating Instructions for the EQ-215 Stereo 15 Band 2/3 Octave Equalizer The frequency bands 250 Hz through 630 Hz affect the lower inid-range of musical material, such as the fundamental frequencies of voices, string and percussive instruments. The frequency bands 630 Hz through 2.5 kHz and especially 1 kHz and 1.6 kHz bands enhance harmonics and fundamental frequencies of voices, strings, percussive, and keyboard instruments. These bands also accent the effects of flanging and phasing. The 2.5 kHz through 6.3 kHz bands affect vocal fricatives, drums, and guitar. The use of these bands is highly dependent on the acoustical characteristics of the hall, its reverberation and sound absorption. Cymbals and the synthesizer in particular will be markedly accentuated by boosts in the frequency bands 6.3 kHz through 16 kHz. By turning up the 6.3 kHz control, the presence of a singer’s voice can, for example be reinforced. One possibility for reduction of noise in PA systems is to cut the 16 kHZ frequency range slightly. 4.3 PEAK Indicator The PEAK indicator will light when the output level reaches a point 6dB below output clipping. The EQ-215 should be operated below this point. 4.4 LEVEL Control The LEVEL control provides ±6dB or ±12dB of level control (from the detent position) only when all Boost/Cut sliders are in the detent position. The 6 and 12 dB ranges are determined by the RANGE switch. 4.5 LO-CUT Switch When the LO-CUT switch is depressed the red LED will light, 4. indicating the frequency response below 43 Hz will be rolled off at 18dB per octave. 5. 4.6 EQ ON Switch When the EQ ON switch is depressed the red LED will light, indicating the EQ is activated. In the EQ OFF position, it causes the equalizer to be by passed. 4.7 RANGE Switch When in the 6dB position (red LED on) it will allow the sliders to adjust the boost and cut by approximately ±6dB. The 12dB position (green LED on) will like wise allow approximately a ±...