i didnt say 10 or 12 for mids .
i was trying to get a cone size big enough that is capable of moving the air which is needed to complete the lower end of the frequency spectrum.
there is a lot of audio nowadays using the bellows of the audio spectrum to simply add sonic impact and realism into the sound.
you need to be capable of reproducting bass if you want 'base'
however, the original poster might have a very small niche that is rock music and acoustic with some skype or other voip software.. then these speakers would not need any more frequency spectrum.
but rock nowadays has a bunch of digital subwoofer bass and digital acid bass that these speakers would seem to be 'outdated'
at least until home theater receivers start coming with an option to crossover bass electronically (for instance, center channel) and then send the 500hz - 80hz/60hz to the front mains where the woofers are.. and then again from 80hz/60hz - 0hz for the subwoofer.