Back in 1982 I listened to 901 Series IV, I believe. Fun speakers! College dorm rooms. Mine were Boston Acoustics A70s.
The 901s took up very little space, played to loud volumes, and did a nice job rendering detail without fatigue. Bass was tight, not boomy or overblown. AC/DC “Back In Black” was a favorite, from an Empire 2000Z cart. Billy Joel “Glass Houses” was fun. Michael Jackson “Off The Wall” and Thriller at loud volumes sounded pretty amazing!
i wouldn’t mind having a pair today! Great bang for the buck, if you’re careful! I would not reform; I would use butyl rubber surrounds.