For day to day gigging in my rock cover band, I usually use my goliath II (rear ported) and for bigger gigs throw in an Eden D115t (also rear ported) - very happy with setup. A few weeks ago, I blew the 115 speaker, probably cause its only 200w and I was over powering it. This weekend I pulled out my D115XLT for a bigger gig to play with my Goliath II and could not get a good sound. Audience folks said sometimes I was really loud and other times they could not hear me. Obviously I love both cabs. Why did this happen? Is it because the rear ported cab was paired with a front ported cab?