Indeed, there are, over here:
http://www.diyaudio.com/forums/parts/169931-what-kind-driver-comes-4-wires.html
It's an Antec Lansing dual-coil 6ohm subwoofer. I've looked for its specs, but without success so far. I thought it'd be fun to use my spare parts, make a simple low-pass for it and use it in the office.
When I figure out the needed frequency, I'll make a proper active filter for them.
For a subwoofer you usually strife for a crossing frequency at or below 100 Hz and a steep roll-off like 18 or 24 dB/octave.
You sometimes find subwoofers that are crossed over at much higher frequencies and roll off much shallower. The disadvantage is that the woofer can then be located as a separate sound source which affects stereo imaging. The advantage is that it fills up the frequency range that cannot be covered well by the satellites.
You sometimes find subwoofers that are crossed over at much higher frequencies and roll off much shallower. The disadvantage is that the woofer can then be located as a separate sound source which affects stereo imaging. The advantage is that it fills up the frequency range that cannot be covered well by the satellites.
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