The optic analogy is good because both sound and light are and act like “waves” but also not so good because the wavelengths are SO tremendously different in size.
If you put a couple SH-50’s or SM-60’s hard packed and play music, you do not hear a seam as you transition from the coverage of one cabinet to the next one.
This would be most like the multiple projectors each covering a segment of the entire image. The upshot is you’re never in the coverage of more than one loudspeaker.
This requires each source to have a lot of pattern control, to have a points of origins close together.
Most line arrays on the other hand are an array individual sources and each is much too small to actually confine the radiation angle each box is assumed to provide.
The problem is, if you wish to halve the radiation angle for a given frequency, you need to double the dimension. The presumption that line arrays are individually narrow segments of an arc ac be seen to be true or not when you measure the vertical pattern a single enclosure.
As generally they interfere severely, if you lay a typical line array on it’s side so that you can walk the vertical pattern, you will hear it is not seamless and often very far from it.
This is most like projectors significantly overlapping and producing something like a Moiré pattern but with sound and so if the wind blows a little, you hear that interference pattern very clearly and if you move around and measure, the response is different everywhere..
Thanks, It isn’t a fair comparison though because the TH-812 is so large but put a pair together with the mouths coupling and that is some sick bass with directivity. I probably won’t be getting one for home use but if there is one around to hear I will let you know. 8X 4 inch voice coils is a lot of motor in a horn haha.
A fellow that came to the first outdoor demo of the J-3 and TH-812 last winter was drawn like a moth to a flame to the TH-812 which overloaded his camcorder microphone. I saw him walking around with like an iphone on a handle but was impressed by the quality of his video and audio when I saw it later.
This was pretty loud, you can adjust the headphone volume to scale the voice when Mike walks up and talks to the guy holding the camera. Most of the attendees were stadium sound related people and rep’s and at 2min + he pans away from the system and you can see we were out in the field about 150-400 yds out.
Later in the day, Mike did another demo “loud” and a couple cars of people drove off to hear it from a couple thousand feet away. When we got back, the Cops had arrived for a second time and were not happy (being rousted from a restaurant).http://www.youtube.com/watch?v=5MOG_sPejGA
The J3 is smaller and lighter than a J1 but has more directivity (one giant horn), is array able, has a more powerful upper section but less powerful sub section assuming there will be subs used with them.
I hadn’t noticed it yesterday but there is a link to that stadium using J-3’s and TH-812’s I linked the video to right here;http://www.prosoundweb.com/article/complete_coverage_implementing_a_new_system_at_80000-seat_spartan_stadium/
And a video from the School;http://www.youtube.com/watch?v=CWtADec3abc
Perhaps, but it is still a good analogy.
Tom, those output/efficiency comparisons for vented vs. tapped horn subs are nothing short of astounding....as usual.