MIC×4, wireless and wired, 2 for the host, and the other two can meet the demand of duet, barely able to cope with chorus. You can have a microphone stand if you have money, but you can't afford to play.
Effector, karaoke, reverberation adjustment, delay, etc. If the mixer comes with an effect device, you don't have to buy it, but you can't compliment it. . . ;
Equalizer, aiming at the system that frequently changes the place of use, should be equipped with equalizer to make up for the shortage of sound field, speaker or back-end equipment. There is money in the 30 th stage, and there is no money in the 15 stage. If there is no money, don't buy it. Just use a blender to balance the 3 rd and 4 th stages.
Mixer, 8- 10, slightly redundant, self-determined budget;
Speakers, the venue is often outdoors. Take three basketball courts as the value standard. Basketball courts are generally 15 meters wide and 50 meters apart. If the budget allows, it is recommended to use four speakers, two in the front and two in the back. Otherwise, using only two speakers will cause uneven sound field, and the people behind will not be able to hear clearly. Every time the distance is doubled, the sound pressure level will decrease by 6dB. In view of your use environment, it is suggested that the sound pressure level at the weakest part of the sound field should be as large as possible.
Delay device: If you choose the scheme of four speakers, you need to configure a delay device. The site size is 28m× 50m, and the longest sound propagation distance is 28.5m According to the sound speed of 340M/S, the sound propagation time is 83ms, and the delay time that human ears can perceive is between 30ms and 50ms, so the delay device is necessary.
The power amplifier can be selected according to the principle of 2 times the speaker power, and the minimum is not less than 1.5 times. Redundancy must be prepared for large dynamic signals. According to the existing conditions, the sound transmission distance is 28.5m, the sound pressure level is 90dB, and the speaker sensitivity is 94dB (estimated average, subject to the actual situation). According to formula LP,
=
Lorazepam
+
10
log
W
-
20
log
R It is concluded that the speaker power needs 323.4 watts, and then considering the sound absorption factors of 300-400 people's own clothes and other factors, the power should be increased by about 20% correspondingly, which is the most basic selection basis. Don't forget to configure the speaker bracket, the height should at least exceed the height of people. In addition, according to the consideration of sound quality and durability, we also need to pay attention to the material of loudspeaker diaphragm, the internal design of box, the heat dissipation mechanism of high-frequency unit and so on. I won't go into details here, the landlord will consider it himself.
If possible, provide a mobile cabinet to facilitate the protection, storage and handling of equipment;
The rest are wire fittings, and good gold and silver wires are also expensive. Based on the skin effect, it is suggested to use a dedicated speaker cable instead of a power cable. 200 threads is enough. It is suggested not to save money by plugging, but it will add a lot of trouble, which is not worth the loss.
In addition, if you play and sing by yourself with an electric guitar, you should also match the Adi box, and the imbalance will become a balance, otherwise it will be effective. . .
That's about it. This is the most basic design process. I hope it works for you. Finally, your budget is too low, and you can't do without it.