Why would you wan to move arm hairs? Can't see your setup in sig but there is no way that sounds balanced unless your using pro audio speakers with ALOT of power. Midbass that is louder than the rest of the music just sounds bad. That being said, there is alot of advantages to running a sub as high as you can without it localizing badly, however, you still want to level match it in the midbass area unless you like it sound strange. On rock music, where you want midbass, you want the instruments to sound like themselves, so unless you can do a clean 120db of treble, no need for hair moving midbass.
Anyway it's frowned on for a few reasons. One I alluded to earlier was that if the sub plays too high, it draws the sound backwards, ideally for SQ you want to not realize the sub is behind you. The frequency this starts depends on the size of the car, smaller cars can be as high as 120hz, bigger cars, sometimes as low as 60. Anything in the back that rattles will be higher frequency distortion and that will draw the stage back too, crossing over low sometimes stops those rattles, so that's an install issue, but it can still be "Fixed" by a lower crossover point.
Lastly, alot of car audio subs have big heavy coils because they know car audio guys want to put 3k to it lol. They also rarely have shorting rings to lower inductance and that leads to 2 things. One, the sub may not even be ABLE to play up to 100hz for example. (common on alot of "high output super subs". Or if they do play that high, they do it with distortion, that again, localizes.
In a perfect world, stop all the rattles in the rear, run a low distortion sub with shorting rings and play it as high as you can without localization to keep the fronts from having to work as hard. A well designed sub can play midbass better than any front speaker, simply due to it's size, excursion and powerhandling capabilties.
