Those percentages are usually correct. And Frank's favorable response to my crossovers has been extremely gratifying, because he has about the best set of ears I have encountered. But in this case, it's Martin's scientific approach to transmission lines that really has made the difference. And the benefits of his work aren't limited to bass quantity and quality. Before Martin really figured out how to model TL's, this type of bass loading generated higher order harmonics that colored midrange reproduction. (I've worked with those designs, including Bud Fried's classic 2-ways). That was a complete waste, since a long damped line held out the potential to dissipate the back wave from a woofer and reduce colorations over its operating range. Martin figured out how to achieve the bass benefits of TL loading while eliminating its negative effects in the midrange. As a result, a design that is optimized according to his calculations achieves superior bass and midrange clarity. My only contribution was to choose a woofer that would work well in a MLQWTL configuration and that would require minimal shaping from the crossover. The tweeter crossover, particularly for the Vifa dx!9, required a bit more work, but nothing ground breaking.