constant dispersion 2kHz - 15kHz point source

Phil B wrote: I`m also in agreement with ( in principle) what Hond is looking for... I`m pretty bored of listening to large ( arena / stadium ) systems where the stereo image is held as the crucial if not overriding design feature? If I`m in the bleachers 150m away from the stage I would want the best sound possible NOT the best stereo image. Having multiple hangs, sometimes with LR reversed for sides and delays just adds to the general confusion of stereo signals and IMO just makes the source signal even more difficult for our hearing to sort out! Reay from NCA once designed a system for Wembley arena with one central column of point source boxes ( admittedly he did then split the column into L/R vertical sections to acheive some stereo imaging!) . Wembley is a horrible room to set up in and usually it`s just trying to contain the room reflections to get a decent sound. That particular setup was the most coherent for speech I`d ever heard. I know in the past that Flashlight has been arrayed like that and no doubt elsewhere round the world. BUT  the modern trend is Line Arrays and stereo imaging .... .line arrays ! ...that`s a another can of worms! Maybe taking that concept one step further with a central column of Unity horns ( and maybe satellite L/R hangs for that important stereo stuff) would be what Hond is looking for? Which is pretty much what Tom Danley is doing in the States with his Jericho horn installs for very large stadiums and arenas?? I`d personally love to hear that one day ! .p.

phil, the main reason for reversing sterio on the LL RR hangs on a touring (48 or more box) system, is to cut dow the nasty as hell comb filtering you get if both of thoes overlapping hangs are playing exactly the same signal. believe it or not, its actualy the  best way to get even coverage from a 4 hang line array system

na you would generaly only ever get 2 hangs hitting any given point LL and L, L and R or R and RR. the slight differences between L and R signal go a long way to reduce comb filtering/degradation, although as you have said, its not perfect.

you must rember also, that this is only effective in the range in which the hangs are directional, but with a large hang that gets you down throught most of the sensitive band.

the sterio immaging created by reversing the side hangs is secondary, and can only be of any real value in some non image relate effects, because as you have pointed out, sterio image panning is obvioulsy useless if you are 50 degrees to SL and the PA RR and R hangs are reversed.

cheers
dave

Has anyone tried a stereo bessel array?

thepersonunknown wrote: ps. its easy to critisize this method, but with my best intention, i ask you to try to think of a more logical way to provide evenish coverage of a sterio signal across an audience of 10000 seated in perhaps a 120 degree arc of the stage. Edit: for example, the SEC in sydney. ive done that place with several differnt 4 hang line array systems, and a MSL4 system too once, and its no easy task to get everything right for everyone in the audience

Funnily Enuff I was in the SEC when I was writing that post the other day! Putting up a lot of K1 and V-Dosc + Delays....

I know the logical way would be to scrap the stereo idea and stick to a mono feed to a central hang with satelite systems for hard panned sounds, as I stated I don`t see why the great GOD STEREO should be adhered to if it confuses the sound field at larger events? It makes me laugh to consider stereo panning on a large outdoor festival site when line arrays are swinging the sound around in the breeze / heat anyway!

Covering a 10000 seater indoor arena with a central hang would be the ideal way to get a better image and less time/ phase issues at all seats? Delays would be easier to align to one central source from stage? At the moment I presume you like everyone else aligns delays to the mains and sod the sidehangs or any floor fills? I don`t agree that arrays have a certain distance they go to and then you can simply ignore them in your coverage plans? ( Soundvision says it only goes this far so I`m  sticking to that...!) Like having side hangs..they will interact with the delays maybe at a reduced level but still enough that at a point say 2/3rd from the stage up in the SR side bleachers you would be getting mains ( say PA R) + sides ( PA L) + delays ( Mono or maybe PA L).....

BUT with the way a stage works and the inset system in place it is very difficult to even consider getting a centre hang into most set designs let alone asking a production if they want to try it?

So we`re stuck with what IMO is a less than ideal sound for a larger number of punters when using multiple stereo hangs. But hey the FOH guy is happy in his stereo sweet spot !

.p.

@Abe The Babe: lol that's exactly what I was thinking about a couple of days ago :p Thanks for that link :) 

Sounds similar to L-C-R, but more so.  Can't fully get my head around the Bessel Array.  Would like to see a big one.