I have an HK 525 and have recently acquired a second pair of speakers that I have connected to the zone 2/ surround back jacks on the back of the receiver. I have been able to listen to multiple sources in the two zones but I'm not able to listen to the co-axial digital input or the optical digital input devices in zone 2. I can only here the analog input devices. Is this normal (ie extremely dissapointing) or do I have some other problem. Thanks. Gus.