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In Reply to: RE: Why do line arrays using directional speakers require shorter lines for similar near field performance? posted by Rafaro on April 24, 2017 at 14:08:22
Interesting and wrong in a number of ways technically speaking.
Wrong indeed, to those who have heard or measured line array (with the possible exception of Don Keele's designs that use the Legendre Shading Function).
That's why I hate "cartoon" diagrams as shown there.
Like the "fake news" from political pundits, this one gives "fake data." Since humans are primarily visual creatures, stuff like this does more harm than good to those seeking a better understanding of audio.
Check out what we were doing today, a new box.
Holy crap. that's a lot of sound for such a small box so far away. I could tell your lens was zoomed in from compressed perspective. How far?
Is the speaker good to 50 Hz? Hard to tell from the program material. BTW, I got a Double CD set of Essential Boz Scaggs music after hearing your last demo.
I can can see why you use "Thanks to You" Great vocal, bass, a treble extremes in that one. Very clean commercial recording, one of the best.
I had the camera at 100 meters from the source (and well past the usable distance for large line arrays) which makes a sound level measurement -40dB re 1 meter (easy to keep track of).
That recording was hitting peaks approaching 90dB fast and avg more like 80dB slow but it hit 105dB A slow at the point the limiters start to get tickled using the stadium type test noise signal. Good catch, the knee in the lf response is -3 @55Hz.
Yeah Boz has some great recordings, I like to use the same material I would use to evaluate speakers in my living room although others play more classic, less subtle PA test program like AC/DC or EDM which I find enjoyable in smaller quantities.
"others play more classic, less subtle PA test program like AC/DC or EDM which I find enjoyable in smaller quantities.
OMG, "classic?", LOL. I do believe your tongue if firmly implanted in your cheek as you write this. Too funny.
I think you once described your TH-50's "as subtle as a pair of Humvees in the living room."..........which, BTW, prompted me to buy/trade for a bunch, since subtlety is not my strong suit!
So you get sales and marketing credit for that one!!
As to "enjoyable in smaller quantities," I concur. The full band, high dynamics, high resolution of microdetails in your speakers means that "micro quantities" of rock music should apply.
Across the board, fully resolving high distortion guitar effects can be quite irritating in a short period of time. BUT, as old Rockers with Garage Band experience, we do love to crank it up once in while, especially when the right social circumstance meets the perfect alcohol tolerance level!!
As I've said before, the Direct Radiator guys don't have both the high and low decibel options that the Horn Guys have, only the low AND at higher IM distortion. A 650 Horsepower Corvette can outrun most of the others, but it can also drive slowly through a parking lot. Those overpriced little boxes at Axpona can only do parking lot driving. I'd rather have the 200 MPH option on the right road.
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