Just adding in. DBA setups do have the potential to give extraordinary bass. If you have the money and ability to implement 4+ subwoofers in a sealed room with proper inverting cables or circuitry for the rear subwoofers, then go for it! If you just want to beef up the bass/sub-bass on your Totems, then getting a nice single subwoofer is like a better choice.
I have heard Rel subwoofers. They are nice and clean and have very good tonal definition down in the bass area. Extremely clean. But they are not powerful and meaty sounding subs. If you want more of a meaty and gritty audiophile sub, I would look first at Rythmik ported subs. There are others, such as Hsu and SVS. SVS has a distinct tone that is popular with consumers of Best Buy, but it's kind of a one-note-wonder and doesn't have good resolution (in my opinion).
The "subwoofer output" on your integrated is likely just a full range output. I don't see any mention of a crossover inside and there are only 2 tubes. The Vandersteen is an option if you want a try crossed over subs that blocks all bass from your main speakers. The Rythmik would be if you were fine driving your Totems "full range" and just wanted a sub to fill in the missing sub-bass area.
I have heard Rel subwoofers. They are nice and clean and have very good tonal definition down in the bass area. Extremely clean. But they are not powerful and meaty sounding subs. If you want more of a meaty and gritty audiophile sub, I would look first at Rythmik ported subs. There are others, such as Hsu and SVS. SVS has a distinct tone that is popular with consumers of Best Buy, but it's kind of a one-note-wonder and doesn't have good resolution (in my opinion).
The "subwoofer output" on your integrated is likely just a full range output. I don't see any mention of a crossover inside and there are only 2 tubes. The Vandersteen is an option if you want a try crossed over subs that blocks all bass from your main speakers. The Rythmik would be if you were fine driving your Totems "full range" and just wanted a sub to fill in the missing sub-bass area.