The tag on top right says "Monitor Series 2",.........below that it says "M7" with a serial # after that..........it has no fuse where the speakers hook up......................
It looks as if they are all somewhat the same except for the change in tweets...i am happy with the SL2500s in these,i have had Peerless tweets in a pair of 10s i had and did not impress me as much as it did others.