AS1963, I posted a somewhat detailed reply to your inquiry on Audio Asylum.
Briefly, I'm not sure that your sub's crossover filter is steep enough to blend well with your Sonus Fabers. Also, equalization can correct the frequency response for one location but may actually make things worse for other locations within the room. The problems of reproducing smooth bass in a small room are formidable, as the room acoustics works against you by imposing a nasty peak-and-dip pattern on your subwoofer's output. This peak-and-dip pattern will change if you move the subwoofer to another location, so one way to get smooth bass in a small room is to use multiple small subwoofers spread around the room instead of one "ubersub". This will average out smoother than any single sub would be. This smoothing is the main benefit that people derive when they add a second subwoofer.
Researcher Todd Welti published an article on the subject that you can read here:
http://www.harman.com/wp/pdf/multsubs.pdf
He advocates using four subs, located symmetrically around the room. I prefer using an asymmetrical configuration, as advocated by Earl Geddes (this might look like it's the same link but it's not):
http://www.gedlee.com/downloads/sub%20study%20.pdf
One other point I neglected in my Asylum post: If you go with a scattered multi-sub setup, you'll need subs that have a steep low-pass filter so that upper bass energy doesn't leak through and disclose the location of the subwoofers.
Multisubs allow you to experiment with unorthodox polarity schemes. In some rooms, it sounds better if one or more of the subs operate in reverse polarity, as this further decorrelates the low frequency energy (which is desirable).
Best of luck to you.
Duke
dealer/manufacturer
disclaimer: Note that in this post I am advocating a technique, not a specific product.
Briefly, I'm not sure that your sub's crossover filter is steep enough to blend well with your Sonus Fabers. Also, equalization can correct the frequency response for one location but may actually make things worse for other locations within the room. The problems of reproducing smooth bass in a small room are formidable, as the room acoustics works against you by imposing a nasty peak-and-dip pattern on your subwoofer's output. This peak-and-dip pattern will change if you move the subwoofer to another location, so one way to get smooth bass in a small room is to use multiple small subwoofers spread around the room instead of one "ubersub". This will average out smoother than any single sub would be. This smoothing is the main benefit that people derive when they add a second subwoofer.
Researcher Todd Welti published an article on the subject that you can read here:
http://www.harman.com/wp/pdf/multsubs.pdf
He advocates using four subs, located symmetrically around the room. I prefer using an asymmetrical configuration, as advocated by Earl Geddes (this might look like it's the same link but it's not):
http://www.gedlee.com/downloads/sub%20study%20.pdf
One other point I neglected in my Asylum post: If you go with a scattered multi-sub setup, you'll need subs that have a steep low-pass filter so that upper bass energy doesn't leak through and disclose the location of the subwoofers.
Multisubs allow you to experiment with unorthodox polarity schemes. In some rooms, it sounds better if one or more of the subs operate in reverse polarity, as this further decorrelates the low frequency energy (which is desirable).
Best of luck to you.
Duke
dealer/manufacturer
disclaimer: Note that in this post I am advocating a technique, not a specific product.