Audio Asylum Thread Printer
Get a view of an entire thread on one page
|For Sale Ads|
In Reply to: RE: Why do line arrays using directional speakers require shorter lines for similar near field performance? posted by tomservo on April 28, 2017 at 14:17:13
Glad to have you join in. Linear arrays can be messy audio affairs especially the longer they get. It seems that it�s the ease of mounting and dismounting as well as the alledged ease of coverage that has kept them in the business. I for my needs went with a "linear array" but a DIY using exponential horns. Because of the efficiency I can limit the column length to just 4 cabs. It really functions more like a point source because of the nature of horns combining their output and the limited number of cabs limiting time smear. Some of the idea came from one of your patents. Sound source having a plurality of drivers operating from a virtual point US4845759A.
The Ureda article quoted in your "Why Danley does not build linear arrays" article was very useful in designing the exit angle of the horn cabs. A common mistake in stackable horn cabs is to have too great a vertical exit angle which can cause lobbing problems in the MR and more so in the HF.
In regards to the topic in question your reply "Line sources produce a forward beam which is a summed form of the forward radiation of each source." So theoretically the more the forward radiation of each cab the stronger the beam the longer the nearfield. Kind of reminds me of pushing back the critical distance in reverberant rooms by using more directional speakers !!
Thanks for the input
"Kind of reminds me of pushing back the critical distance in reverberant rooms by using more directional speakers !!"
When one wants to understand the words in a large space, then Hopkins Styker equation points the direction (the same direction as it deals with preserving information).
An example is in the link;
"The direct field can be improved by
Increasing Q (loudspeaker directivity, difference between what's radiated forward and what is radiated outside the pattern)
Move the listener closer to the source
Reduce the number of sources
Aim the loudspeakers at the listener
Note that by increasing "N" from 1 to 2 will also increase the level of the reverberant field by 3dB. Keep the number of loudspeakers to an absolute minimum in difficult acoustic environments."
Post a Message!
This post is made possible by the generous support of people like you and our sponsors: