Do I need a subwoofer?

REL is a good choice, SVS not so much for a music based system.

Really @shooter41? What’s your experience with sealed SVS subs? My experience with my SB2000 in a fairly high-end, 2-channel setup is pretty damn impressive and I’d think adding another would be even more so, so I’d be interested in what specific experience you have to say this? Yeah, I’d probably prefer Rythmic or maybe even Rel, but they’d both cost much more for similar performance so for the $ the SVS subs get you pretty damn good performance. Maybe you could share what their shortcomings are, because failing a direct comparison to pricier subs I’m at a loss for criticizing them for bass speed, musicality, or depth. Please explain.

I knew someone would get their feelings hurt. I tried SVS SB3000's first with my Kef R900's and they certainly went low but they still sounded like subs and were not what I was looking for. Rythmik was suggested to me so I tried a pair of G22's and found exactly what I was looking for. Seamless integration. I don't fault SVS for any measureable performance metrics and for home theater use I have no doubt they'd fill the bill, they just don't sound as musical to me, or most any other person that's tried Rythmik or REL.

I do think it's strange, though, that you're using an SB2000 in a "fairly high-end" system. You need to increase your sub budget, there's much better performance available for (in Rythmik's case, at least) not much more money.

danager came closest, and torquerulesok darn near put his finger on it.

The solution to subs and getting SOTA bass was discovered in a research paper more than 20 years ago. Since then it has been used by Audiokinesis in their Swarm subwoofer system, and written up extensively here. Every single one of us who tries it raves about how well it works. Audiophiles however are slow, painfully slow, when it comes to understanding new technology.

Torquerulesok sort of noticed but drew the wrong conclusions. Bass energy does get absorbed into the room. Walls, ceiling, floor, the whole room. Which then this energy has to be dissipated, a lot of which goes right back into the room. One of the bigger lesser appreciated factors in muddy bass. People who do notice try and suck it up with tube traps. Trying to get rid of the problem they themselves created with the one big powerful sub in the first place.

Or they try and EQ, making a bad situation even worse. Because EQ has to boost bass even more, and it can sound flat in one spot but that extra energy goes into the whole room making the bass smearing problem even worse. More own goal, more tube traps. Thank you sir, may I have another?

The solution is more subs in more locations produces more smaller modes resulting in bass that is powerful and deep yet clean and clear. It works because with 4 each one needs only 1/4 the output, meaning the lumpy modes are only 1/4 as big, meaning way less excess energy going into the room. This is why everyone with a DBA reports not only exceptionally smooth powerful bass but greater natural ease and detail all across the range.

Do a search. This has been explained countless times. Every single one of us who has done this knows just how well it works. The search bar is your friend. Distributed Bass Array, DBA, Swarm. 

I do think it’s strange, though, that you’re using an SB2000 in a "fairly high-end" system. You need to increase your sub budget, there’s much better performance available for (in Rythmik’s case, at least) not much more money.

@shooter41 No, my feelings not hurt in the least. I transported my SB2000 from my HT in my family room just to see what it might add to my 2-channel system that consists of a Musician Pegasus R2R DAC, Bryston BP6 pre, McCormack DNA-0.5 RevA amp, and Soliloquy 6.2 speakers. The bass foundation was obvious, but the expansion of the soundstage in all directions along with improved imaging even with the one sub properly dialed in was pretty amazing and adding another I’d have to assume would improve things further still. I’ll take two SVS SB1000 Pros for significantly less $$$ over one comparable Rythmic or REL any day as I think two “lesser” yet still very capable subs trump one “better” sub, but you’re certainly entitled to your opinion.

Agreed, two subs are usually going to be better than one, even if that one is generally a more capable model, but with the rest of your system you really owe it to yourself to step up to a better pair.