There is the Bosendorfer Imperial. If you think the lowest notes are not supposed to be played but are there only for resonance, think again. There are pieces written for them.
I also feel that some modern instruments, think stuff like the Blue Man Group here, would suffer without low bass extension in any attempted reproduction. I have recordings utilizing African instruments that make me glad I have the 4345/2245H's capabilities.
If clear, strong bass tones are your thing, there is this: http://www.klavins-pianos.com/index_en.htm Download the sample near the bottom of the page. See the home page to view the beast. I burned it as a wav file with Nero and played it on the 4345's.
Mind you, none of this would keep me from buying a pair of Everests if I could. And despite my reputation for not caring what speakers look like, I am stunned by how bold and beautiful they look. Truly unbelievable.
Clark in Peoria