Mr. T, you need to hear dipole woofers or sealed acoustic suspension. You already know the problem with panels and low frequencies, neither enough surface area nor excursion to achieve the necessary volume displacement. Panels would have to be the size of your front wall. With today's technology I doubt there's any getting around cones for the frequencies below 50 or 60 Hz.
Gradient Woofer for ESL 57
Has anyone ever tried the Gradient woofer (SW-57) designed specifically for the ESL 57? I am using the one they designed for the ESL 63 with good results but I wonder if anyone tried the one that was designed for the 57. Also, if you're reading this post and have one for sale, I would be interested in it.
Thanks.
Thanks.