Originally Posted by jayjonbeach
I have been watching this thread with hightened curiousity and am looking to do 7.1 myself.
I wonder if someone could quickly comment on why Dolby and THX are so different and what are the benefits/drawbacks of each and which would you choose for a 50/50 setup?
Thanks in advance. Jay
If you are using the THX rear speaker layout, (i.e., two rear speakers located right next to each other), you need to use the THX ASA
processing for *everything* you listen to in 7.1. However, that also invokes THX timbre matching
and THX Re-EQ
. These technologies may work well for some movies that are over-bright, but to apply them to everything you listen to, just to be able to take "advantage" of the THX rear speaker layout is inappropriate. This is why most everyone here discourages the THX rear speaker layout.
Originally Posted by sdurani
Spectral Cues Utilized in the Localization of Sound in the Median Sagittal Plane by R.A. Butler and K. Belendiuk, Journal of the Acoustical Society of America (1977); Localization Cues of Sound Sources in the Upper Hemisphere by M. Morimote and H. Aokata, Journal of the Acoustical Society of Japan (1984); The Influence of Pinnae-Based Spectral Cues on Sound Localization by A.D. Musicant and R.A. Butler, Journal of the Acoustical Society of America (1984); Physical Acoustics and Measurements Pertaining to Directional Hearing by G.F. Kuhn, published in the Springer-Verlag book 'Directional Hearing', edited by W.A. Yost and G. Gourevitch (1987); The Dominant Role of Low-Frequency Interaural Time Differences in Sound Localization by F.L. Wightman and D.J. Kistler, Journal of the Acoustical Society of America (1992).
Those are rather old references, the newest being 15 years old and the oldest being some 30 years old. Clearly that research was done well before the introduction of discreet multichannel systems. Although just being "old" doesn't necessarily negate their validity, is there any more recent research that re-confirms their findings, especially in the setting of discrete multi-channel sources? I did a Google search and could not find anything specific to multi-channel audio and the audibility of the "front-back reversal phenomenon". However, there is clear evidence that the "front-back reversal phenomenon" exists in an experimental model. I've attached a reference, Localization in a HRTF-based Minimum-Audible-Angle Listening test for GUIB applications
from Jan. 2007 that confirms the phenomenon in an experimental setting using headphones. It also has 78 references to other acoustics articles that address similar things. In fact, several of your references are in there. However, it is difficult to make the "jump" that because it can be produced in an experimental model, it exists in real rooms at real listening positions.
Has Dolby, THX, DTS, Meridian, Audessy or anyone else documented the existance of this phenomemnon in real HT environments? If so, I, and I'm sure many others, would be very interested in reading about it.
wersenyi2.zip 279.0244140625k . file