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Thinking about what we refer to as "Monkey Coffins," I vaguely associate the term with big 3-ways from the 1970s and maybe 80s. I Googled to see if there was any more consensus and not only did I not find any consensus, I found some descriptions that most of us would consider simply wrong. According to one of the first search-results, a 8" slim 3-way tower would qualify
So subjectively, what qualifies as a Monkey Coffin to YOU?
A few things I think of: