Check it out
We made a ghetto box last night for some 8s -- 1/2" thick MDF, no bracing, we did not actually calculate the tuning or volume so don't ask *laughs*
http://www.youtube.com/watch?v=hLbTtVjdD8c
* Bass Race Run
http://www.youtube.com/watch?v=f_FN83Ut62s
* Burp Score
But yes... the E8s have some good SPL potential.