And you've been abusing if the lcd2 lately haven't you ?
From all the measurements I've seen of the 009, including my own, the thing is flat down to 15Hz, show me the shelving are you talking about. Subjectively, the bass of the 009 is as good as it gets to my ears. One of the few staxes that really has impact while having this tight /tuneful quality that really highlights the recording specifics rather than overemphasize bass like so many phones do, which quickly gets old.
Haven't touched the LCD-2 in months, they are just so inferior to the HD800.
I know what I hear and I'm far from alone in describing the 009 sound this way. After I wrote that I got two PM's thanking me for confirming that they weren't mad and there was something wrong with these "perfect transducers" as they are sometimes described. Plenty of people will think these are the bees knees but why is system matching suddenly a word you use in context with Stax? Normally we have just advocated better amps, better sources as Stax sets did portray what they were fed, be it good or bad. Now you need the right amp with enough top end roll off and boomy bass and a tube source which would have been considered badly designed in the 1920's....
As for the measurements, I have no doubt Tyll did a good job but there is a lot more too this then just FR, waterfall plots etc, and our understanding of these is severely lacking. I'm the first to advocate measurements but you have to know what to look for and that zero isn't always the best outcome. If you design an amp simply for the lowest THD then you end with the O2 amp and utter garbage. The reason for this is quite simple but it goes to show that measurements are just one point of reference and with THD you actually have an actual one number to work from. Measure transducers and this becomes an epic headache as it's quite hard to measure them under real working conditions.