I want to buy a sub for the £200 mark. I have seen the new Tannoy Mx10 Sub, but have not seen any reviews. Are they any good? Are Subs Magneticially shielded? As the sub will be sitting right next to the tv! Is this ok? How much difference will a sub make? I already have some Ageis Two speakers at the front! Just wondering as I was originally going to get a huge REL sub, but it wont fit! Will i still get a big improvement with such a little sub like the tannoy?