Talking to a Volvo tech the other day, he said when he went to Volvo tech school they gave them a Bravo gear set and a Volvo gear set, to look at under a microscope. He could not believe the difference between the two.

I agree! I have access to the same library of materials. There are two different types of spectral analyses, one has a much tighter resolution than the other. This analysis could have been done with the low-res equipment, muddying the results.

But what are they rated for? I saw them at a show, the upper looks bad azz and the lower is hydro dynamically optimized - however looks like a porpoise.