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Join Date: Feb 2005
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Yes, you can use the Omnimic, although my understanding is that the Omnimic only comes with a 0 degree calibration file.
For stereo, you can either point it between the LRs, or point it up, since Dirac won't let you aim it at individual speakers.
Pointing it between the LRs will show a slight treble rolloff.
Pointing it up gives you a consistent reading for all speakers (LCR & surround), but it will show even more treble rolloff.
That doesn't create a real problem. You just have to keep in mind that the treble rolloff you see is due to the correction file vs. measurement angle, and don't try to boost it back to flat. That would sound terrible. Instead, start by following the overall treble curve from the measurement (including rolloff). That will still fix phase, early reflections, and frequency response irregularities without altering the overall frequency response. From there, you can experiment with altering the target curve, and decide whether you like the changes.
It's a little easier to work with a 90 degree measurement file and a mic set to 90 degrees. In that case, what you see is what you get. I'd also recommend using a cheap boom mic stand, if you don't already have one.
So, you could spend $100 on a new mic + a boom mic stand, or you could fiddle with the demo using an Omnimic first, then spring for the mic & stand if you see some promise.
As we've discussed before, though, you are kind of screwed when it comes to 3D audio, and that is no small deal for a long term solution. For experimenting with the free demo, though, not such a big deal. Eventually, I understand there will be more 3d audio options available.
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