I have connected my Onkyo 606 to my Pioneer DV600 DVD player with a single HDMI cable for audio and video. CD music output is great, but somebody advised me to go in for a coaxial audio cable for CD music. The cable will cost me Rs 1050. Should I go in for it? The cost is OK provided there is a perceptible difference in the music quality. Further, will coaxial support SACD and DVD audio recorded in 5.1 format?