The keyboardist in our band has been playing through some EV ZLX 1000W 12's and loves them. Would they be ok for bass pedals? (Minitaur, like a Taurus sound) I want to really rumble the room with them.
The published specs by EV state the ZLX-12P goes down to 65 Hz, and that is probably at -3 db or greater. IMO, that's not going to make a room rumble. At a very moderate volume, that speaker could be used for bass pedals, but it won't get the deep fundamental notes. I'd look elsewhere.
Yea, most powered PA speakers roll off a lot of low frequencies. It's a catch 22, as you don't want them to distort when you crank up the PA, but it lops off a low end. Get a sub and you will feel the difference!
If your band's PA system doesn't have subs, then you should consider getting them and plugging the bass pedals into your band's PA. Alternately, if you want a separate system for just the bass pedals, consider a good bass amp. Some 4 x 10 cabs can get down to 30 Hz, and will cover the upper ranges of the bass pedals as well. Of course, you'd need an amp head as well. A quality rig like like that could cost as much as $1500 ( new ) or more, depending on what you bought. But an active 18" sub + and active upper PA cab could cost as much. With a bass cab and amp head, you would have a more compact setup and more tone shaping capabilities.