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What are the main issues, audio-wise, that you've encountered with line arrays?
Directional characteristics, HF output, lobing, EQ-ing, etc.
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Depending upon the manufacturer, you might want to invest in their software. That is what the A1 with sound company will do for you if you are the BE. The problem with LAs is that people are using them for every venue, whether they are the right tool or not. So, that would be the first thing to look out for. Are you in a short fanned hall, or a long narrow hall? One is right for line arrays, the other ain't.
Line arrays do not lobe from the bottom like a HA would. They are doing it on the backside.
The biggest difference in LAs is the midrange staying together in the far-field. I have mixed on just about everything out there. I used my ears and appreciated the Adamson most. They had the JBL compression drivers on the top for good rock and roll bite and articulation, but the midrange stayed together in the far-field. I liked them more than V-Dosc, which to me sounded like it had pillows stuck in the boxes over the midrange drivers. dB makes some great sounding stuff that some think blows the Meyers away for the money.
There is a phenomenon that I have noticed. If you are outside with a stiff wind, there is a shifting that occurs that is more noticeable to me than when I was mixing on EAW KF850, Turbo Flashlight or other horizontal arrays. A few manufacturers deny it. But listen sometime and hear for yourself. Other than that, I love LAs when they are in the right venue and powered properly.
That is such a general question. Line array speakers need to be hung or set-up correctly to achieve the desired coverage. Planning and though before set-up. What I do is try to obtain a CAD of the area I am covering and then work out what I need to achieve. Line array speaker are quiet accurate and directional so you really need to have them pointing to the source.
Just don't ask to see an impulse plot of a line array.
I think line arrays are a great tool for live sound, but they can't take the place of a good point-source box - there's something that still isn't quite right about the HF of just about every line array I've heard, but I've heard some incredible point-source boxes. One of the best I've heard is Community's iBox, which uses an awesome Beyma 1.4" HF driver over a wide bandwidth. Part of its strength is its two-way simplicity.
Keep in mind - your ears are not a line. And that is why I don't advocate the use of line arrays where a point source box will do.
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