Kijanki, you are correct; it is not like they are flat to 20 Hz. But even if they were I think they would sound a bit thin here.
One reason I would not change speakers to something that would do that is that the SE tube amps that I tend to favor will never control large woofers going down to 20 Hz.
(Another is that I think the speakers that it would take to really do what I want here would weigh 200+ lb and be extremely expensive. And most would still not properly do it.)
So, those are the reasons that external bass augmentation is the best solution.
Even most speakers that do go down to 20 Hz would not solve the real problem, which is just that there is essentially no room reinforcement to speak of, and extra output in the 20-80 hz region (or so) is what's necessary.
One reason I would not change speakers to something that would do that is that the SE tube amps that I tend to favor will never control large woofers going down to 20 Hz.
(Another is that I think the speakers that it would take to really do what I want here would weigh 200+ lb and be extremely expensive. And most would still not properly do it.)
So, those are the reasons that external bass augmentation is the best solution.
Even most speakers that do go down to 20 Hz would not solve the real problem, which is just that there is essentially no room reinforcement to speak of, and extra output in the 20-80 hz region (or so) is what's necessary.