I've been using subs since '98 with excellent results. I think the trick is the right low pass xover and slope. I run my mains, Revel M106 full range and use a Velodyne SMS 1 to apply the low pass slope and freq which is steep and at 60 Hz. I use a REL R305 sub, it's 10" driver is perfect for music and plenty for movies.
It's nearly impossible to locate where the sub is, it blends perfectly. I also run the SMS 1 's EQ to tame a nasty 40Hz room mode. I have a very compact 2.1 system that sounds way better than it has a right to.......it would not be the same without the sub
It's nearly impossible to locate where the sub is, it blends perfectly. I also run the SMS 1 's EQ to tame a nasty 40Hz room mode. I have a very compact 2.1 system that sounds way better than it has a right to.......it would not be the same without the sub