The screen of the LED screen that has just been installed is shocking, but the sound always feels wrong? You may have ignored the speaker placement​The Golden Rule——Last year, a commercial plaza project suffered a sound positioning error, and the audio delay on the day of opening was as high as 0.3 seconds, which directly caused the event to overturn. As novice novices, we have to understand:​The audio position is 1 meter different, and the sound effect may be 30% different​. Today we will disassemble the audio layout channels in different scenarios.

The site type determines the basic layout

​​Outdoor advertising large screenThe audio system is very particularSound pressure coverageandEnvironmental Confrontation​. For example, an LED screen installed on the facade of a 30-meter-high building:

• ​​Main sound expansion​It must be hung 5-8 meters away from both sides of the screen, and the elevation angle is controlled at 15°-25° (prevent sound waves from bounce on the ground)
• ​​Low frequency sound box​To be buried and installed, the interval should not exceed 20 meters
• ​​Waterproof cover​The heat dissipation hole must be installed, otherwise the amplifier will strike in minutes on high temperatures.

There is a pit here: many newbies put the speaker directly below the screen, and the result is​High frequency attenuation exceeds 40%​. The correct way is to refer to the "Design Specifications for Hall Sound Reinforcement Systems" and expand the horizontal distance from the screen at a ratio of 1:1.5.

Technical parameters determine installation details

The brightness of the LED screen directly affects the audio power ratio. For example, when the peak brightness of outdoor screen during the day is 7500cd/m²:

How did this data come about? Actually,Pixel spacing​Related—The brightness uniformity of the P4 screen is 27% higher than that of the P10 screen, and the required audio power can be reduced by 15%. Also notePower supply branch​, do not connect the speaker and the large screen to the same circuit, otherwise the current impact at the moment of power-on may burn the control card.

A hidden solution for special screens

The one that is popular now​Transparent screen with 86% transmissivity​​, how to install the audio so as not to destroy the visual effect? There are two types of mature practices in the industry:

1. ​Array miniature speaker​: Two 40W full frequency units are embedded on the back of each screen module, with a spacing of ≤0.6 meters
2. ​​Waveguide directional sound transmission​: Pre-embed acoustic catheters in steel structure beams, and use grille camouflage at the outlet

The actual data shows that the second solution can​Medium and high frequency clarity increased by 32%​​, but the construction cost is 40% higher. If yes​Stage floor tiles LED screen​​, it is recommended to install shock-proof brackets at the four corners of the screen, otherwise the actor's stomp his feet may cause a scream.

Deep disassembly of high-frequency problems

​​Q: How to calculate how many sets of speakers are needed?​​
Remember this formula:​Number of audio groups = screen diagonal length (m) × field reverberation time (s) × 0.8​​. For example, if a 10-meter-long screen is placed in a gymnasium with reverberation for 2 seconds, at least 16 sets of full frequency + 4 sets of subwoofers are required.

​​Q: Will there be any interference when the audio cable is buried in the wall?​​
Depend on the situation! If the parallel line with the large screen signal line exceeds 3 meters,​Signal-to-noise ratio will plummet by 18dB​​. The correct way to do it is:

• The distance between strong and weak currents ≥30cm
• Wrap the cross sections in aluminum foil
• Add a magnetic loop filter every 15 meters

​​Q: How to break the delay of wireless audio?​​
WISA protocol equipment in the 5GHz frequency band is preferred, and the measured delay can be reduced to less than 5ms. If the budget is limited, remember to install the wireless receiver at the top of the screen to avoid the signal shielding area of ​​the metal structure.

After all, the audio layout isSystem Engineering​. Don’t just stare at the decibel number, you have to comprehensively consider the screen characteristics, building structure and flow lines. Last year, the fence screen project of a stadium in Tokyo was passedAcoustic simulation software12 standing dots were predicted in advance, and the echo problem was finally solved with a reflector array. Remember to bring a laser rangefinder for next debugging—​​The accuracy difference is 1 cm, and the phase difference may be 15°​​, this is not a joke.

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