I've recently tried a new setup for vista's room correction + phantom center:
Arcsoft Total Media Theatre for LPCM 5.1 BD playback
5.1 speaker config in TMT with downsampling disabled
5.1 speaker config in Vista, with center disabled (I don't use a center)
+ room correction = 4.1
multi-channel analog out of Onkyo PCI 200 SE (set to 24/192) to Integra RDC-7 processor
In this mode my RDC7 is only a high-end 5.1 analog volume control with per channel level adjusment. No extra AD/DA/processing or delay is introduced through the RDC7. To allow max processing headroom in vista's room correction I disabled vista's room correction first but enabled the phantom center and I set the correct dB levels per channel on the RDC7 so that DVE's test tones play 75dB in each speaker.
Then I enabled vista's room correction and tried two scenario's:
1) Behringer ECM8000 pointed to front speakers
When I point the ECM8000 towards the frontspeakers, my surround speakers play too loud when testing afterwards with video essentials and a radioshack digital SPL meter pointed to the ceiling.
2) Behringer ECM8000 pointed to ceiling
When I point the ECM8000 towards the ceiling, the high frequencies are a little bit accentuated (which is not really an issue) but the biggest issue is my right surround which plays too silent, even thought I'm using the ITU-T angles for my surrounds as depicted here:http://members.home.nl/d.vandenbergh...m/ex_nonex.jpg
and vista sometimes complains about not being able to get consistent room measurements. I also noticed that the first second of every file played through foobar makes clipping sound, while this is no longer the case when I uncheck the room correction checkbox.
Is this the correct way to measure the speakers/room ? Should I use a simplied micophone such as used by Audessey (omni-directional, pointing to ceiling )?
Another option is to try could be a less directional microphone such as this one: http://www.audioadvisor.com/images/VELOSPL_820.JPG