I am consideing a Samsung HT BD 1252 Blu Ray 5.1 home cinema system. How will a Blu Ray disc with 7.1 audio reproduce sound on this system? Will it play it in 5.1 the next best option from 7.1 or default to 2.1? I intend to use it with SKY+ HD connecting to TV via HDMI for SKY and HC and use Optical rom Sky to H/C. Any ideas please?