Quote Originally Posted by mrfabulous View Post
Actually, these are brand new GPA series III with a Qts of 0.26.
Same problem. Low Q and big cabinet mean no bass. What's that the point of reaching to or below the Fs if you can't hear it?
If I only could find that thread - I think someone mentioned useful bass all the way down to the low twenties....
That's fine if you are prepared to add EQ and run out of umph really quick.

Consider a normal sized cabinet and adding a woofer designed to do what you want. The 604's I know aren't designed for that.