The structure from 1 speaker to 3 speakers is basically over, now let's talk about the mono structure of 8 speakers, also called the center structure, eh? All I've been talking about is central mono.
Today's equipment rental companies will have at least 8 subwoofers, and the simplest placement is to close together in a row, which avoids the trouble of clarifying the interference relationship between distance and wavelength, and also maximizes the mirror coupling of the ground. Sounds pretty reliable.
That's right, right? It looks so fierce.
On the sound pressure map, the energy is indeed much greater. As for the blue line, it represents the presence of acoustic focusing, which is reasonable.
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It was simply a heaven-leaning sword that ran through the entire middle area, including the middle area on the stage. This is not only unfriendly to the coffee in the C position, but even the drum position in the back area of the stage is not spared, how should this drum microphone be turned on? So sometimes it makes sense to put the drum set on the side, but it's strange that the lead singer doesn't stand on the center line.
I'm embarrassed to say that I once set up this structure, and as a result, the director gave advice during rehearsals, but fortunately I had a lot of alternatives, and I immediately rectified them, which is my lesson. It belongs to one of the "I thought it was a special series".
To say a playful structure, it is 8 speakers arranged vertically and closely.
Look at the top chart like this
Because of this length, the speaker will extend under the stage, not that Sub cannot be placed under the stage, but it seems that everyone is not used to doing this. Instead, empty flight boxes are often hidden under the stage.
It's even more obvious when you look at the Side diagram. However, if there is a mess of various debris under the stage, it will interfere with the sound field.
It looks really strange on the sound pressure map, but the 60-100Hz segment is very efficient, and the control behind the offset is also very good.
This is a cardioid structure, which uses 8 processing channels and 8 amplification channels, and the adjacent speakers are all reverse polarity processing, and starting from the 2nd speaker, 1 1 does the delay, which takes a lot of debugging time.
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After I used about half an hour to adjust the settings, I obtained the above dyeing GIF, which is still the prediction result of sitting at home simulation, if the actual debugging on the spot, the time spent will be several times more, but the result is gratifying, really even!
As the saying goes: the gun picks a line, and the stick sweeps a large area. Such a structure, such a result, is indeed a little unexpected to me, sure enough, the world's martial arts out of Shaolin, Shaolin stick method is not simple.