To expand on Learsfool's theme, any one of the recent SACDs of Mahler by SF Syphony with Michael Tilson Thomas will test the limits of a speaker system. Symphony #1 and #6 have over 40dB of dynamic range, with huge sounds juxtiposed with almost silent spots.
These were monitored and mixed using Quad ESL 63's. These speakers will not play much more than 100 db SPL peaks before shutting down. Not suitable for realistic Mahler playback in a large room IMHO but obviously for the recording engineer (Andreas Neubronner) the unsurpassed midrange accuracy of the Quad's must be very important for classical mixing decisions. The recordings have won awards so if you are into classical and want to hear the detail of each instrument (at low SPL's) then this would obviously be a good choice of speaker. If you listen to rock or jazz then I think this speaker would be a mistake (Andreas has PMC AML1, Rogers Ls3/5a and Genelec 1031 too - so I expect the checks his mixes on these speakers too in order to ensure they are suitable for the general market)