You are staring at the three-story LED screen in the mall, and the beverage advertisements in the picture are bubbled, but why does the sound seem to be coming from the fire passage on the right? When a novice begins to come into contact with LED projects for the first time, he will probably fall for this issue - just like the display screen that was spent 200,000 yuan in Hangzhou last year, because the speaker location was not properly placed, the customer complained that "when looking at the hot pot advertisement, he heard the children's songs from the maternal and child shop next door."

​​ Let me first talk about an abnormal fact: the location of the audio installation directly determines the investment cost of the entire equipment by 30%.​​ Many novices think that just hang the speaker on both sides of the screen, but find that either the sound is bounced back by the building to form an echo, or the high-frequency sound is blown away by the wind outdoors. Recently, a friend who was doing weddings complained to me that he equipped the speakers for the LED stage screen. The newcomer always carried a "buzzing" noise when he said the oath, and almost complained to the Industrial and Commercial Bureau by customers.

1. Space characteristics determine installation logic

The most outrageous case I have ever seen is a county gymnasium where 36 speakers were installed behind the LED bucket-shaped screen. As a result, the audience could not hear the referee's whistle clearly during the basketball game. Here are three ways to judge:

1. ​​Outdoor scenes​​: In areas with wind speeds exceeding 5m/s, the speaker should be installed on the screen.​The upper edge is tilted forward by 15 degrees​​, using a windshield is as important as putting a cover on a microphone
2. ​Indoor scenes​: Spaces with a floor height of more than 8 meters must be usedDistributed hoisting​, arrange a group every 6 meters, don’t pile it in the corners to save trouble
3. ​​Arc screen​​: Follow the screen curve, place a set of speakers every 120 degrees angle, just like installing a surround sound system for an amphitheater

Last week, I went to the factory to see the installation process of a rental screen. The technician ran in the venue like a delivery guy with a sound pressure gauge. The plan they made for the music festival was actually installed on the LED floor tiles screen.​The inside of the bottom bracket​​, this will not only prevent rain from happening without affecting dancers' movements. If this kind of operation was not seen with your own eyes, novices would never have imagined it.

2. The hidden secrets of equipment selection

A customer once asked me if I could get a 4K display with a 500-yuan speaker, which is like installing bicycle tires on a sports car. Pay attention to these parameters:

• ​Power Match​: The screen per square meter corresponds to 10-15W (30% redundancy is required to be added outdoors)
• ​Frequency response range​: Cover at least 80Hz-18kHz, so that the dialogue of the voice will not cause dullness.
• ​​Waterproof grade​: IP54 must be IP65 or above outdoors, and IP54 must be dustproof indoors

The guy who was doing wedding later learned to be smart and equipped the mobile LED screen with a sound system with a U-segment wireless microphone. Now he always brings two more when taking orders​Magnetic suction supplemental sound​, when encountering an environment with many columns on the site, it is much easier to absorb directly into the metal structure than rewiring.

3. Common on-site diagnosis of overturning

Recently, I helped my friend troubleshoot a strange problem: the large LED screen is normal, but the audio sometimes does not. Guess what happened? The installation team tied the signal cable and the power cable together for 20 meters, and the electromagnetic interference made the audio signal look like Parkinson's. Here are a few lessons of blood and tears:

1. ​​Sieve selection​: Twisted pair wire with shielding must be used for more than 15 meters.
2. ​​Grounding processing​: The audio cabinet should be grounded separately and must not be shared with the LED screen.
3. ​​Heat dissipation spacing​: The power amplifier and screen power supply are at least 50cm apart, so it will not overheat in summer

A friend who works in a cinema is even more amazing. He installed a smart audio rack with a temperature sensor behind the curved LED wall. When the ambient temperature exceeds 35 degrees, the bracket will automatically drop by 10 cm to avoid the heat wave emitted by the screen. I accept this idea.

Speaking of this, when I think about it, a shopping mall was doing a promotion on Double Eleven last year, the LED poster screens interfered with the fire broadcast. Later I found out that I didn't pay attention to the installation​Frequency band avoidance​​, all of their devices have now been switched to 5.8GHz wireless transmission. So, the tricks in this industry are more complicated than the seasoning recipes of night market skewers.

The editor finally said the truth: If you are just starting out, don’t believe the nonsense of "just pretending". Find a home to provide​Full process technical support​​’s suppliers, from sound field simulation to installation guidance, are much better than doing it yourself. After all, customers don’t care whether you are a novice or not. They only look at the final effect and can give face when shooting videos on your mobile phone and posting to your Moments.

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