Hi, i have no idea when it comes to sound. Last decemeber i bought Full HD tv and sony blu ray player. I then bought a 2.1 sony all in 1 sound system. Now the base is superb, but when i bought it i didnt know i needed to sound system to have an HD input to be able to get HD sound. Now heres my question, i want to update my system to 5.1 and so i have full HD sound. Where do i start? Do i have to buy an amp with HD inputs, plus seperate speakers, plus a sub. I dont really know where to start.