I just got hold of a pair of 1970s Kef reference 104 speakers. Has anyone here have any experience with them? The speakers seemed okay. Enclosures are okay. Surrounds are okay. Drivers seemed okay. but when i drove them with the Sansui AUDxdecade amp. The performance was very very disappointing. Do you think its the crossover? or are these speakers not really good? the label at the back said they were made in Maidstone England. Any suggestions? thanks.