Originally Posted by basshead81 Also I am curious how a Rythmik FV15HP produces the output of 2 XV15's being it has 400 less watts and half the cone surface area? Im not saying it does not, just trying to understand logic about needing twice the power to increase 3db and double the cone surface to increase 3db when adding more subwoofers.
Originally Posted by MKtheater
It uses a different driver and enclosure. Obviously the driver has more dispacement and more sensitive to have more spl and less power. Not all drivers are the same. We are comparing subs with the same drivers with the XV subs. Unless someone needs that extra 2 dBs it will go unnoticed. I have compared many different sub setups and I achieve the same thing with my 13's I could with my 18's I just needed a few more.
That's the crazy thing about the FV15HP. It extends so low for a moderately sized ported subwoofer, and it does so with authority! If you go to data-bass, there are only 4 subs that best its output at 12.5hz; and they are all DIY options that are roughly the size of refrigerators being powered by pro-amps with 1000's of watts. To put more things in perspective, the Rythmik even bests the commercial Paradigm Sub2 and the DIY LMS Ultra 5400 sealed at that frequency! And it all does this with a 15in driver and 600W? Talk about fairy dust...don't know how they pull it off. Kudos to Brian and team.
Now, granted there is much more to a sub than just 12.5hz...fortunately, the FV15HP delivers in those areas as well. Full disclosure: I own one.
To the OP, if you think you'll add more down the line, I would definitely go with the FV15HP, enjoy it (and you will), and then add another later down the line.
Another option I like for your room is 2 XS30s now, and then two more later. It's more costly, but you start getting meaningful output around 10hz and below with 4 XS30s if I had to guess...