I can only assume your talking about Wilmslow audio  

There are lesser DIY or kit outlets just as there are lesser manufacturers.

The point was that a designer can extract a more linear speaker from using measurements to characterise and identify the optimum operating ranges.

Of course making a given set of drivers within a specific enclosure as linear as possible isn't everyones cup of tea. BUT I'd have to dispute ATC's claim of low distortion and accuracy based on these and other measurements. Some people obviously like ATC's implementation but for me a good design is one that uses the drivers in their most linear regions for the benefit of accuracy.

Pseudo science and voodoo is why these and other audio forums are so contentious. If you like something that's not what the label says it is, where's the shame in that? But lets not stick are willies up the manufacturers arses based on reputation alone and the idea of 50 guys with PHd's running around slapping each other on the back.