el`Ol, Unless I'm missing something, the Fs of 41.8 of the 10" is identical to the 15". The drop in Spl of 1.6Db would seem almost irrelevant....no?? Of course being a HT guy as well as 2 channel, I have a little knob that makes up for small Spl differences. But even so, 1.6 shouldn't be too big of a worry.
BTW I have a pair of the tens for rear surround duty.
Bob