I had one - it was probably the best looking sub I've ever owned, but unfortunately there were problems:
- Very mushy sound. - The gain control had to be advanced about 90% of full scale to get it to match the gain of my front speakers on my Rat Shack SPL meter.
I returned it (I had a 30-day no questions return offered with the sub) and purchased a PC-Ultra. I'm now a happy camper!!
Over the course of time here on the Forum, it seems as though the JBL has had it's fair share of problems alright. I cant help but wonder if the Velodyne CHT-12 might be the better choice? I do know from past experience that their pretty bullet-proof and do provide excellent customer service to boot.