one thing that you didnt point out is the efficiency of both speakers. i forget where i remember reading this but its called iron law. go look it up.... it states that as a speaker gets more efficent its bass output will drop because bass cannot be produced as efficiently as the rest of the audio spectrum. in a nutshell bass cannot be reporduced efficentity in a small box. so because the klf-10 has a lower efficency it can be quoted as going "lower" but the reality is its still behind the other two speakers in actual bass output.
if you layed the frequency respone graphs from the KLF-30 and the klf 10 on the same graph the KLF-30 would have more output at 32hz than the 10 would. the only reason it it quoted only down to 36hz is because that is the -3db point. but even at -3db the klf 30 is at 99db which is still 1db ahead of the klf 10.
also someone said that the KLF-20 and the KLF-10 share the same ten inch woofers. thats untrue the drivers are different. the KLF-30 and the KLF-20 do share the mid and high drivers but thats all that is shared through the legend line.
ohh and KLF-30 speakers for the win i know i love mine.
and also congrats on your purchase. i picked up my pair recently on craigslist. good deal and they have been great so far.