Visited my brother this week and after dinner we listened to his 4311b, he is slowly coming to the conclusion that a subwoofer would make a big difference on the low end and I remineded him about a local sale last year of a B460 with crossover that he passed on for around $800 or BO. I was wondering if a pair of B380 would also be a good choice when he is ready to take the next step in upgrading his system. Space wise I think the B460 would fit the best in his listening room of roughly 16x24 with a high ceiling (14' +). Which JBL subwoofer would you recommend, one B460 or two B380?