| The GLX has no horn, its the one with the gold colored aluminum speaker cones. That thing has to weigh 80-90 pounds. The NEO handles more juice, is MUCH lighter in weight and has a horn tweeter . So far I have only used one cab or the other, i haven't tried both at the same time, wasn't sure if it was ok to do that, plus so far I haven't needed that much bump. Either cab by itself pumps MORE than enough volume in my situations so far - ive only owned this setup for a few months, and am still in search for a band, but ive used it a few times in auditions.
I need to read the manual again on the head and study the biamp section. Not sure how that works, I had a late 60's Fender bassman 50 (silverface) that I sold last winter because, although the tone was beyond superb, it just didn't have the balls I wanted . | 
