hi bro aj!
i followed streetsmarts suggestions though im still sort of tweaking the sub. (i now have two, ps1200 + this ultra 10) nevertheless i know that the punch that i was looking for is now present as i watch movies or listen to diff kinds of noise errr music. it seemed not present before eh. para bang bitin. also before, i can localize where the bass is coming from... which is on my right where my ps12 was located. i heard from audio enthusiast na hindi ata dapat ganon. my comparison though were limited to the diff set ups that i was fortunate enough to audition/experience. to put it subjectively - nanibago ako. i can now feel the sub rather than hear it. this baby moves air.
anyway, im no audio guru so im just saying im enjoying my investment. 
here is the suggestion of bro streetsmart which i followed:
1. Set LPF of both to 120 hz
2. Set them both in front, flanking center speaker. This ensures that they are equi-distant from the main listening position, else you will have a problem with delays.
3. Activate the test tone of the AVR. Attach only one sub and set its volume (at the rear of the sub) at around 1/4. Get the spl reading through a Radioshack SPL meter. Detach that sub and attach the 2nd sub. Adjust the volume of that sub manually until it reads the same as the 1st sub. Now, attach both subs to the AVR, using a Y-connector.
4. Adjust the volumes of all speakers using the test tones of the AVR.
5. Make sure all your other speakers are set to "Small" or "not full-band." If your AVR can provide a recommended crossover point, fine. Otherwise, use 80 hz for all speakers.
did i answer your question bro? hope i did! (eto yung lalagyan ko ng ahas cord mo kaya bilis... bilis! )
many thanks bro blackD70, will try to play around as you suggested...
though, got only one sub due space constraint...
You can also try to play with the phase controls. The subs should have a phase switch at the rear: 0 or 180 degrees.
Connect one sub only and have someone switch the phase between 0 and 180 while you play a test tone. The louder setting is the correct one. Do the same with the second sub.
Then try the combination of both and switch the phases of each sub separately. Again, the louder one is the right setting.
If one or both of the subs has a continuously variable phase setting, you can fine-tune the phase control even more, using the same technique.
Actually, the best is to use a Real-Time Analyzer and select the phase setting which gives the flattest curve but that's more complicated.
sir streetsmart, salamat din sa mga advises nyo, like me that still tweaking my setup....
