Dual vs single sub

Several posts above I wrote: "your four subs only approximate a line source; each sub still behaves as an omnidirectional point source."

Presumably in response, mijostyn wrote: "4 subs at 4 foot intervals with the outer two in corners does not approximate a linear array. It is most definitely a linear array up to 125 Hz or so."

Okay, but a line array is not a line source. A line array *approximates* a line source, which is what I said.

"If you review the acoustical properties of linear arrays you will note that they throw very little acoustic energy off their ends almost totally killing any refection off the side walls of the room

Imo their behavior at their ends isn't a potential issue; their behavior out in front of their ends (along the sidewalls, in this case) is a potential issue.

I know how to model line arrays. The spacing you used is not optimal. I can explain why if you are interested.  Because its propagation is not perfectly perpendicular to the line, your array will have increasing sidewall interaction with distance. I’m not saying that’s a fatal flaw, only that it happens.

"No other array does this in any dimension."

A planar array does this in two dimensions. In fact, I think a planar array would make more sense than a line array for your situation, given that your room doesn’t have a back wall (which imo offers you a unique opportunity). Again, I can explain if you are interested.

Duke

"Duke had told him OB/Dipole subs would be a better choice for use with his loudspeakers."

"when I told Duke what drivers I was going to use he said mine will kill his."

Okay that’s it. I’m firing my marketing department!!

Seriously thank you both, and thank you too Tim. I try to promote the distributed multisub concept when I post here rather than my specific product, but that distinction probably doesn’t always come across. My product is really just one possibly way of doing it. I would rather spread a good idea (which Earl Geddes developed and freely shared with me) than sell a lot of subs. (This isn’t as altruistic as it might sound - I have enough orders on the prosound side of my business to keep me busy full time.)

Nor is a distributed multisub system necessarily the most sensible approach for every situation.

If mijostyn takes my posts with a grain of salt, that’s fine. He has every right to be skeptical; I would be if our positions were reversed.

Duke