I've seen the H/k 320 listed with DTS-ES, but does it do Dolby Digital EX? I am trying to decide between it and the Onkyo 600. Will the 320 sound better than the onkoy 600 with 6.1/7.1 (with an extra stereo rear surround amp)? I read in another post the Onkyo uses matrix, not discrete EX/ES, is that true? Will that make the 320 sound better since it has discrete?