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The Outlaw 990 has XLR outputs but I can’t find the XLR outputs level spec in the manual.
It is: +16 dBu at +4 db or +2 dBV at -10 dBV?
Any one knows those parameters?
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I looked at the poorly written specifications of your processor and you're quite correct to be confused. I suppose they think we're mind readers. Usually if the single ended level is offered, you will assume the balanced is simply twice that level. But they haven't spelled out maximum or nominal too clearly so it's hard to say.
Anyway, it's of no importance, since the BFD conveniently provides input level VU meters (I hope those who think input level indicators aren't an essential item read this).
If you press and hold the IN/OUT switch of the BFD until it flashes, the VU meters are now reading input level (rather than their usual output level indication).
Set the BFD rear operating level to -10dBV (which represents a nominal level of ~315mvRMS) and a maximum level of +2dBV (which represents a level of ~1.25vRMS).
Set your LFE sub output from the Outlaw at neutral trim and play a movie that provides a lot of bass (War of the Worlds, Transformers, etc) and watch the VU meters. Be sure to play it at the loudest you would normally ever use.
If the VU meters are continually in the red, drop the trim a bit and see if that's OK. If not, switch to the +4dBu setting (which represents a nominal level of ~1.24vRMS) and a maximum level of +16dBu (which represents a level of ~4.9vRMS). Repeat the experiment.....
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The next concern is my sound card, how good it is? Good enough?
How can I reference the sound card?
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Most any soundcard is good enough as long as it has a line-in and line-out jack (most laptops don't). What do you mean by 'reference' it? You create your own calibration file to make up for any response anamolies....
brucek