I'm in the process of upgrading my HC to THX. I've just bought a Denon A1SR, and am in the process of getting the Kef TDM speakers. My first thought was to go for 4XTDM34DS's but a number of threads in the forum have said that using these di-poles as backs is not a good idea as you can not be sat in the null point of both speakers. So now I'm confused. Would I be better off using a pair of TDM23F as backs instead? I know that a lot of people say di-pole Vs direct raditors for backs is a matter of taste, but I can't find a shop that can set up both set ups for me to see which I like best. Any thoughts? Has anyone done this? Am I being silly and should I just go with the 4X34DS's which a number of people swear by? Thanks for reading my waffle, I hope someone can help. Cheers, Too Tall.