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As we change the calendar to November here at Danley, our minds move to the season of Thanksgiving.  We are thankful for many things, including YOU!  We are thankful for those of you who have been fans since our beginning, as well as those of you who have come to know us since that time.  Please take a few minutes to read through the November edition of the newsletter.  You'll find some important "nuts and bolts" information regarding prices, ordering, etc.  You'll also find the regular amp and tech features.  We pray as you go through the upcoming Thanksgiving season, you will find many things for which to give thanks!
100 Ways to Use Your Nano
The Danley Sound Labs Nano has been flying off the shelves since its introduction at InfoComm 2017.  Customers are finding the high fidelity in a miniature size enclosure allows them to use the nano in 100s of places WE never even thought of before! We will be developing a new marketing piece (“100 Ways to Use Your Nano”) to take advantage of that and share it with you.  We'd love to hear your ideas too, so please send them to jeff@danleysoundlabs.com and your suggestion(s) will be considered for inclusion in the brochure as well as possibly winning a free Nano! 
Danley Sound Labs to Participate in
Stadium Show in Barcelona, Spain
Danley Sound Labs is excited to be a part of the Stadium Business Design and Development Summit in Barcelona, Spain on November 27-29, 2017.  Danley has extensive experience in designing and providing audio solutions for stadiums across America.  In fact, of the top ten capacity college football stadiums in American, four of them feature Danley systems.  Danley is also the speaker of choice in three NFL stadiums.  We haven't even mentioned all of the other college stadiums, basketball arenas and even an NHL arena that feature Danley audio.  We are excited to bring this expertise to Europe as we present our company at the Stadium Business Design and Development Summit.  We would love to see some of our European Danley fans at the show.  Be sure to look us up!
Why Danley Won't Build Line Arrays PT2
Prof. Doug Jones
 
The Line Source
           
Last time we took a look at the point source.  Just like the point source, the line source is a mathematical expression of something we can't actually build. To be a true line source, the line has to be infinitely narrow, or skinny, and infinitely long that is to say it has no dimension in one axis and goes to infinity in the other. The perfect or ideal line source would produce a wavefront that, instead of looking like a sphere, would look like a cylinder. The advantage to such a device would be that instead of the pressure dropping off at a rate to 6 dB every time the distance from the source is doubled, it would drop off at only 3 dB!  This would be fantastic if there were not a very serious price tag for it.  Remember that a point source by definition is small relative to the wavelengths it is producing.  The definition of a line source is that the source is infinitely large in one dimension compared to the wave that it is producing and has no size in the other dimension.  

Meyer Sound pointed out in a technical report called, Line Arrays: Fact Theory and Myth, “it is theoretically possible to construct an audio line array that follows the theory at low frequencies. However, the array requires more than 1000 fifteen-inch drivers, spaced twenty inches apart to do it!”[1] One way to deal with the problem of needing to be infinitely long, is by shrinking the universe!  This is not so far-fetched as it sounds.  Line sources which extend from floor to ceiling indoors, for example, perform close to the ideal. In fact, you can effectively double the length of a line source by simply standing it on the floor.

The problem is that even if one could build a line source that behaved like the mathematical construct, it would not be an ideal loudspeaker. The price tag mentioned earlier is that the line source achieves this directional “control” by using interference.  The cylinder is formed when sound from all the different areas of the line interferes with itself. What is often overlooked in the line array literature is the interference is also apparent in the on-axis response.  Various manufacturers of line arrays have developed a variety of techniques to reduce the frequency response problems, with some limited success.

Another issue is consistency. A point source behaves like a point source no matter where you observe it from.  Up close it behaves like a point, and far away it still behaves like a point.  With a line source, even an ideal one (unless it is truly infinite), up close in the near field, it can exhibit line like behavior.  But as you get further away from it, you discover that it begins to behave like a point source!  This transition from near field, or line-like behavior, to far-field point-source behavior is frequency dependent and also varies with the number of boxes in the array. So the line array has problems being consistent in terms of frequency response and also in terms of coverage. If you are trying to meet a performance specification of ± 3 dB over an entire seating area, it is highly unlikely that any line array will accomplish this, unless serious smoothing is applied to the measurement.

Finally, we need to talk about efficiency. Here is a graph showing the behavior of 14 boxes of a popular line array.  This graph is taken from software that is written by this manufacturer.
 
[1] Meyer Sound Technical Report, Line Arrays, Theory Fact and Myth copyright 20020

This graph shows the output from 14 subwoofer boxes: that's 28 eighteen-inch drivers powered by a total of 32000 watts of power!  You can see that there is almost as much energy coming out the back of the array as there is coming out the front.  At 50 meters, roughly 160 feet, this stack will produce just under 120 dB SPL at 80 Hz.  Pretty impressive, until you realize that there are bass horns which will match or exceed that with 4 drivers and 6800 watts, making the horn nearly five times more efficient than the line array!   Where did all that energy pumped into the line array go?  Well some of it, of course, is escaping out the back.  But a great deal of the energy, perhaps most of it, goes into the cancellation process!

The Plane Source

The third type of theoretical sound source is the plane source. The ideal point source has no dimension, the ideal line source is a line infinitely long with no width, and a plane source is infinitely long and infinitely wide.  If we could build such a thing, it would produce a wave that did not lose any energy at all as it propagated!  The amazing thing is that this is the easiest one of the three to build! If you can't build the infinite, like we mentioned for the line source, shrink the universe! If you take a tube of a given dimension, like an eight-inch pipe, and use a sound source that occupies the entire area of one end of the pipe, like an eight-inch driver, you will have created a plane wave tube.  The sound wave will propagate through the tube with virtually no loss at all!  Back in the old days, before electricity, speaking tubes were used in buildings as intercom systems.  These were essentially plane wave tubes connecting each apartment in a building with the front door.  Plane wave tubes are useful in the laboratory for measuring the absorption characteristics of various materials.  However, outside of the lab, it is hard to build a source that is very large relative to the lowest frequencies needed, and it is even more difficult to shrink the universe!

 

OK, so we have talked about point sources, line sources and plane sources.  Next time we will reveal the Danley solution.

10/27/2017
Remote Support for System Engineer
By: Josh Millward
 
Having the best amplifiers in the world is great. However, there are always difficulties that arise when out on the job site and attempting to actually execute the installation. Fortunately, this age of information and connectivity mean that installers are never alone out there in the field scratching their heads. 
 
Danley Sound Labs uses a myriad of different technologies to assist installers, technicians, and engineers who are out in the field trying to sort out issues. There is a multitude of applications, both web-based and stand-alone, that can allow the tech support crew at Danley Sound Labs to connect to a computer in the field remotely and see what is going on. Obviously, these applications all have security features built in to allow access only when the user wants it. But, when the person in the field needs help, it is often only a telephone call and an internet connection away. 
 
Remote support is often used to aid and train users to operate the System Engineer software. It is typically very simple to set up with an internet connection on a laptop’s WiFi interface and the same laptop’s wired Ethernet interface connected to one or more amplifiers. Using software like Skype or TeamViewer, or a web application like Join.me, a remote connection can be made. This connection can be used to train users on how to operate the System Engineer software, or it can be used to troubleshoot amplifier operational issues. Diagnostics files can be gathered from the amplifiers on the network for further study by the support team at Danley Sound Labs. 
 
Our connected world makes it even easier to get assistance when dealing with some of the complex tools we have at our disposal these days. 
 
The current version of System Engineer is 7.00.15. This version is available for download from our website:
http://www.danleysoundlabs.com/dna-system-engineer/
The current version of firmware for the DNA 10K4 Pro and DNA 20K4 Pro amplifiers is 1.306.
The current version of firmware for the DNA SC48 is 1.394.
Loudspeaker Master Preset Stack version is 20170424
The firmware and loudspeaker presets are included in the System Engineer download zip file for System Engineer 7.00.15.
DNA product videos can be found on our website:
http://www.danleysoundlabs.com/danley-u/dna-amplifier-and-processor-training-videos/
 
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