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Фрагмент инструкции
If low and high level or speaker cables must be run parallel and in close proximity to one another, they should be bundled separately. Operating Manual - LX-308B Stereo Line/Microphone Mixer 7. TYPICAL APPLICATIONS 7.1 Small Sound Reinforcement System: In the setup shown here, the LX-308B is used to mix typical sound sources that might be found in a small club, school theater or similar environment. INPUT channels 1 & 2 are used for microphones for live vocal or instrumental pickup. INPUT channels 3-8 are used for the output of electronic music devices such as keyboards, MIDI sound modules, drum machines, etc. The SUB OUT jacks provide feeds to a cassette deck (or any recording device) for making a recording of the mix. The power amplifier (or any additional graphic equalizers or electronic crossovers which may be used) is fed from the MAIN OUTPUT connectors. (Note: Connections shown are AUDIO connections only. MIDI connections are not illustrated.) 7.2 Church, School Or Meeting Room Sound System: Here the LX-308B is used to mix sources typically found in a church, classroom, or meeting room. The first two INPUTS are used for microphones for live vocal or instrumental pickup. The third INPUT receives a feed from an electronic keyboard. The remaining INPUT channels are used for audio devices such as film projector or video player, a cassette deck, a CD player, and perhaps even a turntable (with user-supplied RIAA preamp). One input channel is reserved as a spare. The SUB OUT jacks feed a cassette deck (or any recording device) for making a recording of the mix. The power amplifier (or any additional equalizer or electronic crossover which may be used) is fed from the MAIN OUTPUT connectors. Operating Manual - LX-308B Stereo Line/Microphone Mixer 7.3 Midi Recording System: In this setup the LX-308B is used to create a recording directly from a MIDI studio setup. INPUTS one and two are from MIDI keyboards. INPUTS 3-6 are from MIDI sound modules, and INPUTS 7 & 8 are from a multitrack tape recorder, synced externally to the MIDI controller. The MAIN OUTPUTS provide a stereo feed directly to a two- track mixdown tape recorder. (NOTE: Connections shown are AUDIO connections only. MIDI connections are not illustrated) 7.4 Submixer In Larger Sound System: In this application the LX-308B is used to provide a mix from the MIDI keyboard setup to the main mixer without tying up a number of channels on the main console. Up to eight INPUTS (more if several LX-308B units are linked) can be "pre-mixed" in stereo. Either the main OUTPUT or the SUB OUT connectors can be used to feed the mixed keyboard signal to the main mixer. Operating Manual - LX-308B Stereo Line/Microphone Mixer 8. TROUBLESHOOTING TIPS 8.1 No Sound Check the AC power. Is the power switch on and illuminated? Check the level meters. If they are operating, the problem between the mixer and the later components in the system. If not, check to see you really have an input signal and that it is on the desired channel. Check that you have the master gain controls at the desired operating level. 8.2 Distorted Sound Something is being overdriven in the signal path. If the clip indicators are active, reduce the channel level controls. If the clip indicators are still active, reduce the input signal level. If the level meters are constantly in the red, reduce the Master gain and increase the gain of components following the mixer. There are many gain adjustments in the mixer itself and probably several others in other system components which makes it possible to overdrive an input section and then incorrectly try to reduce the gain of the output section. The best way to approach setting gains is to establish the operating level 9. DIMENSIONS of input stages first by setting their gain as high as possible but leaving about 20dB of headroom for loud peaks, then move on to set the master gain to produce a good meter reading. Proceed to set the gain of equalizers, limiters, crossovers, and amplifiers following the mixer in the same manner, always working toward the later stages of the system. 8.3 Excessive Noise If the noise is in the form of hiss, the problem is usually due to an input stage set up for low gain and then compensating by increasing the master gain. Turn up the channel level controls and reduce the master gain. 8.4 Excessive hum This is usually caused by "ground loops" in the system wiring. A complex sound system with many sources separated by significant distance and using several power outlets has many opportunities for this problem to occur. If possible, feed everything in the system from one power source with a common ground. If you need help, get in touch with your Ashly dealer or call an Ashly technical service representative at 1-800-828-6308. !+ !+" !+ Figure 9.1: Dimensional Drawing for LX-308B Mic/Line Mixer Operating Manual - LX-308B Stereo Line/Microphone Mixer 10. SPECIFICATIONS DISTORTION THD at +20 dBu, 20Hz-20KHz . . . . . . . . . . . . .<...