Don't believe I've ever seen a W6 or 7 in IB. With a smaller trunk or the install taking up most of it, I could see it. Problem is the effective cone area isn't that big due to the surround so you'd need 3 where a good pair of IB subs would suffice, for example.
What's a "good" midbass speaker to you? Quite a broad (and arrogant) generalization of an entire forum. And all my speakers were more than $25 a pair so you need to back up your statements a little more instead of speaking in generalities.
I do my Backing up with my Car!!! Thanks.
I thought I was pretty clear when I said I know of several World class Sounding cars using the w6-w7 some of which running IB, with plenty of trunk room to spare.