Have you encountered this situation? The outdoor LED screen that cost a lot of money to install, always feels the sound is stuffy in the box when playing videos, or the audience will feel noisy after standing and watching for ten minutes - maybe the speaker is installed in the wrong position! Today we will break it apart and talk about this problem that makes newbies trouble, and teach you step by step to avoid those invisible pits. (Writefully: There are unique secrets of senior engineers at the end of the article)

Let me give you a key point:​​The audio installation location of the outdoor LED screen directly determines the 30% propagation effect​​. Just like the wrong time to add salt to the stir-fry, no matter how good the ingredients are, it will be useless. Recently, a friend who was doing a shopping mall event complained to me that they had a newly equipped 6-meter-high LED screen with the speaker installed directly behind the screen, but the sound was blocked by the screen. Finally, they were forced to rent four mobile speakers temporarily to remedy...

​​1. The underlying logic of the installation location​​
Here is a point that novices are most likely to ignore: outdoor LED screens and audio are actually "symbiotic relationships". The screen must be visible clearly and the audio must be listened to seriously. Both must be protected from sun and rain. Take the common P10 outdoor advertising screen as an example. The brightness usually reaches 5,000 nits. At this time, if the speaker is installed directly in front of the screen, direct light will cause the plastic shell to age and crack in two years.

There is a very interesting new trend in the industry recently:​​Waterproof audio bracket with heat dissipation hole​​Begins to become popular. This bracket can be like applying a film to a mobile phone, ensuring sound penetration and keeping a safe distance between the speaker and the screen. Last year, the arc-shaped LED screen of a landmark building used this solution. The audio is hidden in the arc-shaped depression of the screen, and the sound source cannot be found at all from a distance.

​​2. Comparison of actual measurements of five major gold installation positions​​
Just get the real stuff! We conducted actual tests on the three most common installation methods on the market, and the results were surprising:

1. ​​Top hoist​​(suitable for heights above 5 meters)

• Advantages: The sound field covers a wide range and is not easily blocked by pedestrians
• Fatal injuries: There will be resonance noise when encountering a level 6 wind
• Tips: Be sure to install rubber shock absorber pads

1. ​​Bottom embedded​​(Favorite for commercial complexes)

• Advantages: Strong visual integrity, convenient for daily maintenance
• Dare problem: It is easy to accumulate water on rainy days to cause short circuits, causing
• Tested data: 5° installation angle inclination can reduce rainwater retention by 80%

1. ​​Side-mounted installation​​(Commonly used for temporary activities)

• Advantages: Simple wiring, lowest cost
• Hidden risk: left and right channels are prone to imbalance
• Remedy: Install sound reflector

Here is a real case: the main stage LED screen of a music festival last year, and the speaker is installed at 2 meters high on both sides of the screen. As a result, the audience in the front row was deafening to listen to, while the lyrics in the back row were not clear - this is a typical sound field stratification phenomenon. Later, the engineer installed two sets of auxiliary audio on the top of the screen, and the problem was solved immediately.

​​3. Self-question and self-answer session​​
Q: Why does my LED screen sound always have noise?
A: Ninety percent may be the installation location triggers resonance! Try to hold the audio casing with your hands. If the noise disappears, it means that you need to install a shock-proof bracket. There is a method: placing two layers of car sound insulation cotton between the bracket and the wall, which can reduce mechanical vibration by 60%.

Q: How to determine whether the audio power matches?
A: Remember this formula:​ ​Screen area (㎡) × 0.5 = Total audio power required (W)​​. For example, a 20㎡ LED advertising screen is just right with 10 100W speakers. Don’t believe in the nonsense of “the greater the power, the better”. Exceeding the power will cause sound interference.

Q: What to do if there is a sudden heavy rain?
A: Focus on checking three parts: 1. Whether the drain hole of the audio mesh cover is unobstructed 2. Whether the waterproof rubber ring of the junction box is aging 3. Whether the elevation angle is greater than 15°. There is an emergency solution: use waterproof spray to apply temporary coating on the audio surface, which can withstand heavy rain for 2 hours.

Recently there is a new technology worth paying attention to:​​Directional sound field control system​​. The algorithm allows the sound to propagate in a direction like a spotlight, which is particularly suitable for LED window screens installed in pedestrian streets. Actual tests show that this solution can reduce the sound pressure level 10 meters away by 15 decibels, and you will no longer be afraid of disturbing the public's complaints.

The editor finally nagged: Don’t think that audio installation is an "accessories project", the tricks here are more complicated than choosing a screen itself. When planning a project next time, remember to design the audio position and screen structure simultaneously. Never wait until it is installed before reworking - that cost is much more expensive than buying a new audio set!

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