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Tuga,

It is very much NOT about the Point Source. The Point Source is absolutely irrelevant label that was invented by the single driver enthusiasts in order to mentally differentiate their speakers from multi-drivers configuration and in order to justify why some people are not able to integrated multi-drivers. It is like a ship going across an ocean and leaves a water mark behind: one person can design a ship to hit zillion important operational parameters of the ship and another person who is clues about the whole about ship building would design a ship to leave specific water mark. There is no need to ask this person how fast the ship might go, what would be displacement, draft, length, ability break to ice, What would be propulsion system, what would be fuel, people or cargo capacity. Those people will see only that the ship leave the watermarks in the shape of Mogein Dovid and they are ambivalent and immuned to understand anything else.

I think the concept of Point Source itself, as it is being use by single-driver people shell not be used and very many single-driver designs are not proper Point Source. I might endorse the Point Source concept but only form a perspective of actual true mining of the term. Back in my photography time there was a devise: optical bench and one of the attributes of this devise was an optical system the set up the calibration target at infinite distance. Not the 100 times of focal distance of a measured lens but in true infinity (think bout a very powerful inverted binocular). In this setting the dimensions of target have no width and it is just a dot in space. This characteristic is important for some optical measurements. BTW, I was a semi-inventor of a very interesting devise for silver photography that took advantage of many benefits of “Single Point Light Source” in enlargers – it worked very very well, anyhow it is a history… So, why I bring it all up?  Because in my vocabulary I do use the Point Source concept but it has absolutely different meaning then what single-driver people trying to use. When you have a stereo installation and you play (proper) mono material then you playback present sound radiated from a single point directly between the loudspeakers. This is all know and simple BUT the absolute dimensions of this monophonic single point, an ability of the single point to maintain own  minimum dimensions at the stress of different dynamic and frequency ranges and the most important – the mechanisms of evaluating of the single point dimensions is totally different subject and I treat THIS subject with high respect. Generally the smallest single point Sound would be able to collapse itself on mono the better imaging you will have in stereo, but it is not all so simple and there is LOT more to it. Anyhow, that is the definition of Point Source that exists in my vocabulary. The way how the single-driver audio people use terms Point Source ordinary is just the way how they were sold to use the phrase by the stupid audio propaganda and they juts repeat it brainlessly like monkeys.

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