I just recently upgraded to a receiver that decodes HD sound. Using the Onlyo sc-886 pre amp with a sunfire power amp. Now..... i almost only use it for blu ray and dvd movies. When playing blu ray, its usually TrueHD 5.1 og 7.1 or pcm 5.1, 7.1 og DTS ma 5.1 og 7.1 Is it best to just set the receiver to trueHD and Dts, og should I apply THX processing with these sound formats ? In that case what does people usually use......THX surround EX....or THX ultra2..or maybe DPLIIx ? Its my understanding that Surround EX is best used with 6.1 sources, while ultra2 is better for 5.1 sources ? Also, i understand that if i apply THX ultra2, I somewhat cancel the audessey settings... So my problem is mostly how to set the receiver to play HD sound formats..whether to use THX processing, and in that case, which one. Thanks in advance.