A curved panel is MUCH more difficult and costly to build if trying to achieve both good and consistent results. When it comes to mass production and profit margins, time and cost are things that a manufacturer tries to keep to a minimum. If they can't do this, the end result is increased production costs with a commensurate increase in retail pricing. The more that you raise your price, the less accessible that it is to the masses. The less accessible that it is, the less potential that you have for sales.
As a side note, i don't think that anyone finds the Sound Lab's to suffer from break-up, even though they make use of a curved radiating surface. Then again, these have a phenomenally rigid and very time consuming to build support structure. The fact that Roger West segmented the panels also reduces the potential for membrane break-up, which demonstrates just a small portion of the amount of R&D that he's investing in making these products as good as they are.
Roger Sander's could also build and market a product similar to the Sound Lab's, but whether or not he considers it to be a highly marketable product and / or has the resources available to do so is another matter. From what i understand, Mr Sanders was put in a less than desirable position due to the way that Innersound was stolen out from beneath him. Sean
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