There was a while in the 90’s where getting Celestions for a smaller maker was not easy (I forget why) and a few makers had to switch to Eminence or at least have Eminence make them a speaker to their specifications. I always thought SLO’s were not for me because for years I heard them through those shit Legend speakers. Same with the P50 from VHT/Fryette. Horrible for the midrange. Once I heard a SLO through a greenback cab, my whole perception of the amp changed for the better.