————–[MIO XYtri 7.1 / 5.1 / quad / stereo processing]————–
XY-tri is a method of stereophonic recording created by Andrew Levine utilizing 3x pairs of 45 degree X/Y pairs. It is able to be upmixed to discreet 7.1, and downmixed to any combination of 5.1, 5.0, quad, LCR, stereo, or mono. The MIO +DSP is used to sum/difference the multiple pairs, allowing easy 5.1 monitor in a stereo headphone enviroment on location. A delay matrix built within the MIO is used to upmix to 7.1
Details can be found in Andrew’s AES White Paper or on his webpage.
—— XYtri folddown to 5.1 (L, R, C, LFE, Ls, Rs) —–
– the Difference of C-XY_L minus C-XY_R is low-cut and sent to the front L speaker
– the Difference of C-XY_R minus C-XY_L is low-cut and sent to the front R speaker
– a small part (0.3) of the Sum of C-XY_L plus C-XY_R is low-cut and sent to the C speaker
– a small part of the low-cut filtered sum is added to the front L (0.3) and R (0.4) speakers
– the same sum is low-passed and sent to the LFE
– 2/3 of L-XY_L and 1/3 of L-XY_R are low cut and sent to the rear Ls speaker
– 2/3 of R-XY_L and 1/3 of R-XY_R are low cut and sent to the rear Rs speaker
—– XYtri fold down to Stereo —–
– the Difference of C-XY_L minus C-XY_R is low-cut and sent to the front L speaker
– the Difference of C-XY_R minus C-XY_L is low-cut and sent to the front R speaker
– a small part of the Sum of the C-XY_L plus C-XY-R is low-cut and added to the front L (0.4) and R (0.6) speakers
stereo seperation is increased by adding …
– L-XY_L is sent to the front L speaker
– R-XY_R is sent to the front R speaker