One of the popular "urban legends" about the A25 is that its sensitivity (efficiency) is 90db/1W/1M.
This number comes from an old Stereophile review published in the 1970s. It did say they measured at 90db, but it was with a 10 watt signal at 6'. Which means they are actually around 83db/1W/1M.
There were two other published measurements on them back in the 1970s, one put them at 83db, the other at 84db.
I bet I've seen people post that they are 90db efficient a few hundred times.