JBL SP8 titanium laminate woofers, cheaper than HTI8, even.
Why these models? They're from "In-wall" products, i.e., closed-box; EBP 65 and 66, respectively.
Yup, these work too, 4406B Xover, 3 kHz, but it took two notch filters to tame them, left.
[LOOK cool, tho.... ]