Paradigm Signature V2 vs JL Audio F113

Well those numbers don't tell me about real performance in real world applications (unless I plan on winning a loudness contest).
What does tell me something is the time I spent with the Paradigm Servo 15 in a retail environment and custom installation projects. I personally have never found any subwoofer at $1500 (or double that, for that matter), that outperformed the Servo 15 in combination for movies and music! It is definitely my favorite. (and I say that from working in a few audio/video stores in my day.
You'll be hard pressed to bottom out or distort that woofer during movies or music (as much as I like M&K woofers, you can bottom them out much easier in my experience), and it's very musical as well. It puts out plenty of volume, with lots of power and control.
As for the JL. Couldn't tell ya.
My thought is if it ain't broke, don't fix it! I'd go with the Paradigm. They've always made good subs for the home

Hey Bob, tell us an example of the measurements these subs offer at certain frequencies, where it would be pertinent enough information to chose one sub over the other, strictly (as your suggestion) on those measurements/benefits, etc.
I'd like to hear this one...
...and no, really ,what are you stating you can pick out using these measurements, as far as selection choices go?
I really think the reading audience here would like to be able to know what you are talking about, so they can maybe pick up some pointers about picking subwoofers bassed on the numbers? Because this DEFINITELY would be something of a new science to most here, in terms of shopping for a woofer, I assure you.

Well Bob - and anyone listening here - if any of these subwoofers (or any speaker for that matter) where going to actually be used, setup in a large 500,000 cubic foot ware-house, or out in the open in a park, I could see one subwoofer/speaker possibly outperforming another in certain aspects of output and loudness capabilities. For that, I would concede superiority of one speaker over another - especially for that/those applications, in such large open spaces.
However, 99% of the time, these subwoofers are going to be used/placed in relatively small domestic home spaces, where the close proximity of boundaries to the woofer drivers and ports are so close, that there is an exponential reinforcement curve of the frequency response and volume level of a given frequency set, who's frequencies lie within a certain range in the bass response. Respectively, the frequencies that are boosted the most, are the lower bass notes, who's frequencies are very long wave lengths - easily boosted as a factor of the proximity of boundaries, in relation to the wave-lengths. Actually, any frequency who's quarter wave length is longer than the distance of a boundary to the woofer (in this case), is going to be reinforced at a certain factor (I think 6db of boost for one boundary, 12db for 2 boundaries, and 18db of boost for 3! - I think that's right)
Never the less, the practical application and real-world performance of one of these subwoofers over another, placed in a small acoustic space, is going to negate any real advantage here, in the respect you're suggesting.
Actually, I believe audio/magazine reviewers have covered this point on numerous occasions over the years, when reviewing subwoofers, and real world applications. In fact, placing the Sunfire in/near a corner, would boost ALL it's perspective frequencies and output so much, that it would possibly NEVER distort at any output level of relevance, I suggest!
I've had experience with both the Velodyne's and Sunfire's over the years. And I find the key is really in the setup of the woofers, as a first priority.
I also wouldn't way that one Ferrari is superior to another, simply because one set of statistics is better than another. Each one would have to be judged in the context of it's APPLICATION! This I think is the far more important factor. I would judge one subwoofer much much more on their musicality and response time rather than how low and loud they could play at certain frequencies, balls out! but that's me.
I'm sure an engineer would see things differently, from a pure science point of view.
But then EVERY SINGLE speaker and audio equipment engineer I ever met (and I met a few of them, including John Dunlavy, Bobby Palkovic, Peter from PBN, and others) has A COMPLETELY DIFFERENT OPINION ON WHAT IS BEST, MOST ACCURATE, AND WHAT IS THE RIGHT/WRONG WAY TO BUILD EQUIPMENT!!! - even difference in opinions on what are the importance performance and measurement criterion for a speaker or piece, amp, etc.
I basically don't think the measurements you're siting make that much difference, as a critical performance factor, in most typical home applications. It's like saying a bookshelf speaker is of no use, because it only plays down to 80hz, or starts distorting at a lower output spl level, than another.
That's my opinion anyway. I wouldn't not get one woofer because another played lower, louder, basically - just on those criterion