Weak current College】 【mixer use issues.

1 mixer signal input section need to be aware of the problem: it has introduced the input signal is generally divided into low resistance and high-impedance input, but how to define a way to signal is low resistance or high resistance requires flexibility. For example, in accordance with standard electric piano, electric guitar, etc. belong to the high-impedance signals, to use 6.35 plug can only be entered into the mixer, but in some places, from the stage to the connection between the mixer is too long, the line of resistance, together with the lighting system interference, so that the signal line background noise is very large, even if you do not enter any audio source signals, in a mixer on this line the input channels of the gain on metropolis has a lot of noise, as described above: this line is a river that now this river sediment has too much, nor is this line in the noise a lot or not convertible, and the line side of the instrument's sound volume is way up and no longer increases, the river can only give you the deep water, what should we do? if you are using high-impedance input signal is equal to the water in the river water is not without increased, sound quality can be changed, of course, no way to change; if you use the card you unplugged from low resistance Jack input signal, the river of shallow water will be after amplification of low resistivity amplifier so that the depth of water, water quality, sound quality is fine. That seems not quite true, everyone can try. I now do a lot of work, the band are all used the card Lennon interface from low resistance type, although not standardized, but is in fact reduce the band noise. So audio workers need to be flexible, pragmatic, practical search for the best way to work.

2. AUX sections need to be aware of the problem: I know there are faders AUX front/rear conversion, standards compliance, listens to signal to the stage with faders sent before, but in General or in the performance of which faders and sent. AUX signal used to listen to the stage as an example: I have two computers with AB CD machine took turns playing music, when A single music out I would pull down this road, you can turn off the volume faders sound, then the road B volume faders to push up. But at this point A single CD player could play disc, still in play, then if it is sent after using faders AUX signal, stage speakers, will not have A CD out of the sound, but if it is sent before using faders AUX signal, stage speakers will be the voice of A single CD sent, so the stage speakers up at the same time have A, B two CD machine voice, singer there is no way to listen to, although this time the master volume on the outside and is not affected. Therefore even send some author AUX auxiliary are also carefully adjusting.

3. Group allocation problems: marshalling areas need to be aware of the problem is quite simple, since all marshalling of volume can separate output without switching into the master volume, which requires the author to group the careful, for example: I used 5-6 Group to control the volume, bass sound mixer on most of the input channels of the Group 5-6 can continue, but if you are going to seriously, the microphone channel or press the microphone channel 5-6 Group produces bass sound feedback; it is now 5-6 group I have from behind the output independent output signal, and it is no longer passed the total volume output sound mixer, which is 5-6 marshalling to the total volume of the mixing console switches no longer pressed.

4, illusion power: most of the mixer will have within a 48 volt phantom power, which can be used to promote a variety of capacitor microphone, but because it is from the microphone line transmission of electric current, so always check the phone line, that line, otherwise the line contact when it makes a lot of current impulse sound. There is also a phenomenon that is: If you use a mixer with a battery of capacitor microphone, do not open the phantom power, otherwise they interfere with each other, make it rain "sand" in General.

5. recording input: most of the audio input channel mixer is a simple control and then directly through the sound mixer total volume output, so carefully, do not produce malfunction, suddenly the voice of the audio channel from the master volume on a mixer.

6, output level: the authors are aware of the standard level is recording 0dB, but actual performance generally exceeded in many or even reached + 10 dB, so don't see red light is a great start, but in real use, slightly exceeding the signal level is reasonable, then out of the sound effects are also the best. There is one thing to note is that when the peak indicator reaches + 4dB, rear and its corresponding output volume level before reaching 0dB 0.775 volts.

7, some functional buttons: in addition to important adjustment knob on the sound mixer are multi-functional knob, button, or switch, for example: positive and negative phase transitions button, high removal or low removal button, button, before and after conversion Fader Mute button, buttons, etc., some monitoring is often used by authors who are skilled, not often used in understanding the basis of its basic functionality, do not go to regulate them, lest we produce misoperation.

8, headphones and sound field effects: a lot like Master Chief has been tuned with headphones, headphones are very important, but the headset voice after all and onsite voice vary greatly, so I'm going to listen to the scene. Not unrealistic, wishful thinking to headphones as a point of reference, when you want to know in the sound recording, the headset can be used as a standard; in the scene when the headset is just a tool, but the standard is the author of the ear, to listen to the scene.

Where some of the important functions of a mixer and operational skills are also essential is said to have, there is one thing to declare: this technical article is to look at the broad underlying audio workers; those advanced theory, high-tech, let people see the clouds fog article is expert characters to the expert or experts look after all, the basis of! majority, they sound workers more need is easy technical articles!