Any fully open back speaker could qualify. There are a lot: Electrostatics, Maggies, Time Windows... yes they have wood frames, other wise they would droop and sag.
Don't forget Vandersteen 4's. All you see is the top & bottom oak caps & that big black sock wrapping 95% of the speaker.
I've seen pictures of the Vandy 4s sans sock. Very odd looking thing: a very strong central tower of various speaker enclosures (black MDF) attached at top & bottom.
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