FYI, QUAD ESL63 vs SimPole

[ChrisABC]

Interesting- Quad ESL63 vs SimPole OB March 2011
https://www.zelfbouwaudio.nl/forum/viewtopic.php?f=3&t=13334

Visaton FRS8
https://solen.ca/en/products/frs808

Speaka 150/170 (na)
https://www.rapidonline.com/speaka-150-170-loudspeaker-10in--55-3605

(* moderator * can you add to title " OB diy " tia)