Well, I got to try a Supercube 6000. I have a 18x23' room. I have placed the subwoofer along the front wall about 1/3 the distance from the left corner... After using the Audyssey XT on my Onkyo receiver, I tried using the subwoofer with Saving Private Ryan.
The subwoofer is very compact, light at 38 lbs. One lacking feature is that you cannot connect the sub to a two-channel system that has no pre-outs. There is no way to connect the speaker connectors to the subwoofer because the subwoofer does not have outputs to connect to the speakers themselves. You can only connect the sub either a LFE input or separate pre-outs.
The subwoofer has a small remote that can control volume, 5 EQ settings and phase. I connected the sub using no EQ (flat), volume at 36 (max 40) and phase 0 degrees.
After running the self-calibration, the sub was tested with the movie. At its flat settings, the sub could go down pretty low, my guess it bottomed out between 25-30 Hz, closer to 30Hz. But the mid-bass was weak. The Audyssey set the front speakers as large and the crossover at 80Hz. The rears were set at 120Hz. I do not think the sub can go above 100Hz. The area between 50-150Hz was almost gone... I could hear the low bass but the midbass was just not there. When you hear explosions, you can hear the deep rumble but the explosion itself was weak.
I tried setting the sub manually, all speakers at 80 Hz (the speakers are Polk 55is with dual 6.5" mid-bass drivers). Yet the sound was not balanced. I know that using dual Polk 650 subs (with two active 10" drivers in each sub) provided a lot of mid-bass but it rolled off quickly below 35Hz. Granted that was with two subs. So I put one of the Polk subs back and the SC6000 in the other position. The mid-bass came back somewhat but was not all there yet.
I have played with the EQs (Off, EQ1 extends the lower bass but limits the volume, EQ2 and 3 are for music and EQ4 is for movies). EQ1 did extend the bass but the bass seemed compressed. EQ4 somewhat increased the mid-bass but also seemed compressed.
The SC6000 cannot energize my room with bass. The speaker size does not seem to be large enough. Interestingly, my old Sunfire TSWII could really move the air in the room with a 10" driver. I will play around with it some more but to be frank, the trial run of the SC6000 leaves a lot to be desired in its present state.
If it's not a BIG screen, it's not a theater...