I believe that those subs with stiff suspensions need to have the appropriate amount of motor force to overcome that resistance. If not' date=' they become mechanically over damped in a sealed box, leading to a faster drop off down the response curve, especially in a box that is smaller than the subs VAS rating, which are typically quite high with subs that have stiff suspensions.
And so a ported box is more appropriate for such subs to prevent excessive damping from robbing low end ouput.
If I'm wrong somewhere, show me, because I really would like to know.[/quote']
So essentially what you are saying is that pressure is higher in a sealed box and that over-damps a woofer with a stiff suspension?