For me, I think it’d be some old ‘giant woofer’ Cerwin-Vegas... just a big ugly wall of slow, ill-defined muddy bass, and not much else. Runner-up would be some mid-fi Infinity speakers I owned early on. Had a sense of false detail via brightness, not much bass, and just kind of a flat, featureless midrange. The Spica TC50s I replaced them with were orders of magnitude better. .