[dlmh]

I have a 27" iMac 2011, connected to my logitech z5500 receiver via optical port. When i play movies with DTS HD and DTS on the screen of xbmc show DTS 5.1 and the receiver screen also show DTS.

The logitech support DTS 96/24 5.1 channel also its THX approved.

As far as i know DTS HD audio uses 96 kHz / 24 bit bitstream up to 8 channel.

my MKV says DTS-HD but with 5.1 channel

I don't know if this is the same or you receiver has to be also DTS HD supported.

I suppose the same thing is with the mac mini 2011. I will tested and post again

When playing DTS-HD through S/PDIF or through an HDMI 1.2 connector, the DTS Core track will be extracted from the DTS-HD track. So you will get the 1.5 MBit/s lossy audio track, not the lossless one.

Fantastic. Glad to know I'm not going to have to spend $850 to get smooth 1080p videos. Thanks again.

Yes, the base model will play 1080p flawlessly, just like the previous models. The main difference is that only the current models (both Intel and AMD) can bitstream HD Audio.

The only reason you'd want the AMD model is that the Intel HD Graphics still suffer from the same 24p bug that plagued the previous iterations. This bug causes 24P material (recorded at 23.976Hz) to be played back at 24.00 Hz, causing a small stutter every 40 seconds or so, while it should be played back at exactly 23.976Hz.

Every AMD and nVidia graphics chip from at least the last 5 years has been able to this correctly.