Bose 301 series II, early/mid 80's vintage
They were cheap, found at a pawn shop. Used 'em on the back patio outside. They made sound. Hooked 'em up to a crown pro amp once, and they actually seemed to like it, but they still sucked. Amazing how much power they took without bursing into flames. Fortunately, at the time we were living at the edge of town on a 2 acre lot, so the neighbors never complained.
Second worse, probably my Optimus Pro-x4AV speakers, some micro sized two ways that Rat Shack used to sell for $40/pair. They had a aluminum cabinets, ported, ~3" woofer and 1" dome tweet. They can't be too bad...still have 'em hooked up to a frankenstien computer-desktop system, but never really use them anymore.
Having nightmare flashbacks to some white van speakers roomies had back in college. Big, painful, ugly.