I currently use a Yamaha Hitb system and find the sub struggles to cope with films like titan ae. I was considering swapping out the sub to a REL and then upgrading the amp and speakers at another time. Thought I would geta bit of advice from my local hifi guru as he has a REL at home. His advice was to stay away from the likes of REL and buy a balanced speaker package as he had been unable to set up the sub to his satisfaction. Interestingly, one of my mates runs a Boston system with a REL sub and is noticing directional bass, which now means he is considering stereo subs. Any thoughts?