My assessment are as follows:
The 9.0 is not the curved speaker enclosure and sports a 4" driver, and will cost same as 8.1 - here is 8.1 is better.
9.1 is similar driver size as 8.1 - will cost twice as much as 8.1. The same goes for 9.2 against 8.2, 9.4 against 8.3 and 9.5 against 8.4.
I wonder how much will 9.3 be?
Parang mahal! But evo is 3x pricey than 8 series, and the 9 series sems to be the offering of wharf for the evo performance at lesser budget.
IMHO, the comparison of 9series is with the evo one - so mura siya.