At the moment i have a PDR-10, which seems to work well, altough this was my first and only sub, so had/have nothing to compare it by. What i want is something that pushes a bit more air, so thought i would need a bigger box. Not knowing what the rel's look like, i thought maybe get a rel q150....untill i saw one the other day in sevenoaks hifi........how is something that small going to move any air and the quake is evern smaller....so have now ruled them out. Now my choices seem to be down to: B&W ASW675 = Loads of power and will prob match my speakers (602,cc6,601,lm1)....but again it is still on the small side. CHT-10 = seems to be a nice little sub, from the reviews on here, but it is not much bigger than my PDR-10. CHT-15 = Now this seems to be the one i am more atracted to...nice and big, quite a bit of power in it, a nice big cone, loads of room in the box to move plenty of air. BUT.....will it be a bit to big for my room.......???.......my room is 13' by 13'....i can put it in the corner where my PDR-10 is and the misses will not moan as i can have pretty much what i like in here, but will it overpower the size of the room and sound crap........ I then thought maybe, just go for the cht-10. Its not much bigger than the PDR-10, but would it be a big improvement over it. Then i tought maybe the 675...its tiny but has loads of power to move that little 10" cone, but how much power to get an improvment over the PDR-10 and would it start to go into distortion......?? HELP...so many decisions.