I am listening to right now, a 15 that is 95db sensitivity, but only goes down to 38hzYeah, because 95db is an extremely high efficiency 15" woofer and the problem here is that high efficiency woofers have to be engineered different and they do not have a "free air resonance" frequency low enough to do bass down at the 20hz point. The woofers that do have a low enough resonance will need to be heavier in weight with a stiffer spider and therefore will not have as high of efficiency. It's all a design compromise and we are dealing with physics here (no speaker manufacturer can give you everything on a silver platter with just one driver). $$$ doesn't necessarily mean "best" or "better".
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I would have figured a 15 goes BELOW 20hz.. Ok so the inner core also makes a huge dif on how low a 8 inch will go.
You can't expect all woofers to be your perfect dream. Everything is a compromise.
I've had discussions with mozatfan in the past where I suggested Markaudio drivers (he was on a full range driver kick), but he apparently poo-poo'd these drivers because they were British and he thinks British speakers suck. At that point, I lost interest in discussion with him.
Full range drivers are always a complete compromise anyways where you sacrifice some aspect of the sound/characteristics to get what you want. It is actually incredibly difficult to engineer and manufacture a full range driver that really works well throughout the entire frequency range.
He also seems to try to do "best speaker" arguments by selecting drivers he thinks will prove his point. I do agree with others here, I think we have another Kenjit.