Rythmik, period.

Just looking at the specs wouldn't the hsu or svs be louder at lower frequencies ? (I didn't just compare one against the other, I was looking at a few of each brand.)

You said more music than movies, and I responded with the best solution for that. If you need more of a good thing, then get more. I can't imagine needing more than two Rythmik F12s in all but the largest rooms. Employing two subs has a tendency to even out peaks and nulls in a room. What is your room like? Size, features, furnishings?

The specs are 90% bullshit!

All ported subwoofers have undamped resonances that are a problem.

The best I have ever heard for tight clean sound, low distortion, and linear response is the NHT B12D subwoofer, which is a sealed acoustic-suspension design with tons of power. 

I use one; it's a bargain at only $700.

Another advantage of this design is relatively small size; a 14-inch cube.

My system is basically a music system, altheough I use it for TV sound also.

I have Gallo CL-3 speakers, the sub, and a Audio Research LS-26 preamp with a Bryston 3B-SST2 power amplifier. Good stuff.

I've heard that servo subs are weird, that you can't really hear the bass, but you can feel it ? I don't know if that's true or not, but it's something that concerned me.

http://www.enjoythemusic.com/magazine/equipment/0709/rythmik_f12se.htm

http://hifi-unlimited.blogspot.com/2011/10/boom-boom-room-rythmik-audio-f12.html

Thanks for the links, very informative. I forgot you asked about the room it's a 12X12 but beside the doorway is where the closet is and the closet isn't really in the wall it comes out of the wall about 3 feet and is about 6 and a half feet long. It has 8 foot ceilings.

I have an Outlaw sub and have been very pleased with it. I also have heard good things about Hsu. And then there is Emotiva. I do not have one of their subs, but I have a boatload of their speakers and am very impressed with their price/performance ratio. Also, they have a sealed sub which has advantages.

Trey

of subwoofers or even a single 15" might be overkill. What are your loudspeakers and other associated gear?

I am soon moving my gear into a larger room. I was looking at bigger subs because I wasn't sure how much of an improvement a little better of a sub that's the same size would be versus a little better and a little bigger of a sub. I mostly listen to heavy metal, some rock and rap/hip hop. My gear right now Is a harman kardon avr 147 receiver, a pair of paradigm titans, a pair of paradigm mini monitors, a paradigm cc-350 center channel, cerwin vega cmx12s sub. I'm replacing my receiver with a better amp. My friend gave me a pair of nuance towers but I haven't hooked them up yet, they probably don't sound as good as my paradigms.