Originally Posted by Willd
What makes having lower inductance more important in a sealed system as opposed to a vented one?
And is a an Le of ~2.5mH really detrimental to performance below 100Hz?
I say sealed because, firstly, this thread is about a sealed build.
Secondly, it's generally accepted that a second order system is preferred for critical listening, because of it's better potential for the best transient response. This is partly because the roll off profile is very user controllable vs any
It's also important to maintain a flat anechoic response to an octave above the crossover point. Yes, as Kram points out, EQ can fudge the in room response somewhat, but it robs the system of headroom in that critical area of BW.
A ported sub uses less amplification and so it has less headroom to begin with from 40Hz through the crossover region. Since headroom for transients in that region is critcal to accurate reproduction, I would assume that accuracy was not the motivating force in deciding to build a ported subwoofer. They are cheaper to build and more efficient at tune, the down side being the physical size.
If your crossover point is one octave below the Le induced corner, you're OK. Otherwise, your Le can be considered too high. Some may call that a strict standard, but those would be folks who lack experience on this subject.
Since transient response is limited only by frequency response, the subwoofer has much more potential to accurately reproduce transients in the crossover region than the mains and a sealed L/T system has the most potential for the best transient response...
I would say that a high Le driver is not the best candidate for a sealed sub...as I said...for my money...YMMV