Many thanks for your replies ! This is a very nice board indeed - and in good measure the reason why I decided to go with Axiom in the first place. All my contacts with the people at Axiom (Brent, in particular) have also been helpful and enlightening. The conclusion is that a sub will be added to the system at one moment or other: probably a HSU or an SVS maybe an Axiom. One last question: does any of you have some experience with the M22's used as surrounds ? I know that this is a somewhat heretical thought but I am still curious to know opinions about this....