Regarding A sub, in my own investigations, I've discovered there are subs which can draw a signal from the speaker terminals of an amp (in the case of an active sub). I'm not sure how this might apply active / powered speakers. (Maybe you could use use some splitters off the input to speakers or off the output?)
I know nothing of the Emu cards specifically, I chose not to go down that path (but i've not bought a dac either). Multichannel soundcards can have subwoofer outputs, i've not done this myself though.
Below is bit of text regarding subs by Energy (who've i've been looking at for myself)
Quote:
How do I connect a powered subwoofer?
Connecting a powered subwoofer is extremely simple. Most of today's digital home theater receivers or processors have a dedicated "Subwoofer Output" connection (RCA or Low-Level). Simply connect a male to male RCA connector from the output on your receiver/processor to the subwoofer input on the subwoofer. If your receiver/processor does not have a subwoofer output, using speaker wire (high-level) from the Front Left and Front Right amplifier outputs is recommended. Please ensure you do not connect BOTH Low and High level connections simultaneously, as this will cause damage to your powered subwoofer.
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Looking at the manuals yields more specific info. I really wouldn't know how to go about it in regards to powered speakers. But still, the fact that there are subs which can take signals from a source other than 'sub out' may be of interest to you,