Celestion SL 12 si

I own a pair of SL 12s. They are not lead lined like the
SL 6s but the SL 12s use the same tweeter and mid/woofer
drivers as the SL 6s except there are two mid/woofers
in a wood brace cabinet(they are biwireable.

Does anyone have information on the speaker or can you direct me to urls where I might read a review/s. The speakers appear in the USA early '90's.

Thank You,
Raymond