could be the 760i , the MKII of the 761 ,763 but instead of 70watts 4ohms ,70 watts 6ohms, it depends ,all look the same only the size makes them more powerfull in the catalog, it´s for sure a 760 or up the catalog sold in early 90´s , not sure now but i know them, i have the 761 ,when looking to buy others i notice this pair of speakers as a MKII of the 760,
Positioning them for sure if more apart will sound better and not limited by the room size, this were made to be positioned with stands sold by Mission and they do release a great detailed sound