Hi John

Am wondering what you are using for a sub now, z2300 or z5500? Also, those JBL's are actually only 23 lbs rather than 34 lbs which is what the z5500 sub weighs and is the set up I use when I want the windows to rattle.

If I went to something larger and heavier I admit there is a temptation to get non- powered speakers to keep it light, but, with powered speakers if one isn't working right, you can finish the gig. If you are using non-powered speakers and a PA head, if the head goes, you are sunk unless you carry extra equipment, and to me that is extra work for nothing

Scott