What could the design rationale be behind the different cross-over frequencies in the 2 largest models of the Northridge series?

The thing is that the only differences seem to the that

-- the E90 has two 8" woofers and cross-over frequencies at 300 Hz and 4000 Hz, whereas

-- the E100 has two 10" woofers and corss-over frequencies at 1000 Hz and 5000 Hz.

The squawkers and the tweeters are apparently the same, and so is the sensitivity etc., so is the rationale in model E100 that the higher cross-over frequencies allow it to handle more power?

The E90 had an excellent review in "Revue du Son" / October 2003, by the way. Jean Hiraga concluded that it is "Une réussite totale en termes de rapport prix/performances".