Based on the reasoning I espoused earlier, it makes sense -- louder --> larger excursions for each driver, or same excursions with more drivers.
So theoretically, it should sound better at "normal" listening volumes. Even smaller excursions == even moar linearer.
The only problem that I can foresee (thinking out loud here -- which is always dangerous, it's kind of like chewing with your mouth open) is that you get to the point of -- if you listen quietly -- not having enough energy to get the drivers moving at all (isn't there some minimum?). I have no idea if the maths corroborate this -- someone with experience with line drive arrays should tell me if there's no problem listening as quietly as possible.
Boy am I glad I didn't get the JH13 yet -- now I can go straight to (not) wanting the JH16.
Basterds, all o' youse.