can I wire 5 speakers on a 4 ch?

[sicilianiggy]

I have 4 100 w speakers and a 400x4 amp. 2 fronts 6.5 on door components with tweeters. 2 6.5 on rear doors. My car has a 8 inch factory sub I disconnected when I put my new sub in.

Can I get a 8 inch mid speaker and somehow wire it to the 4 channel?

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[sicilianiggy]

Another question I have is. If I run my components active how would this be wired. I have front components rear 2 ways and a channel amp. All ohms.