Interesting topic...
There are some more underseat sub options:
Eton USB 195 (or USB 150 but only for HiFi housing)
Jehnert XE200
Rainbow IL-S8F
Gladen ONE 201
Ampire Neo 8 or new BMW-W1
Audio System AX 08 / AX 08 Plus
Aurasound NSF8 (some modification needed)
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