Here here is my guide to 1980s Infinity EMIT tweeters:
490125 is the rectangular EMIT with the thick magnet structure. 490126 is the same except for a round faceplate. Later versions of 490125 were labled 902-5086. Later versions of 490126 were labled 902-5023.
490123 is the rectangular EMIT with the thin magnet structure. As above, 490124 is the thin magnet structure with a round faceplate. Later versions of 490123 were labeled 902-2252. Later versions of 490124 were labeled 902-3082.
All of the diaphragms are the same, and thus interchangeable. The EMITs are easy to take apart (some Google work will show you how). Thus, when looking for replacement EMITs, look for a good looking diaphragm at a good price.
490125 is the rectangular EMIT with the thick magnet structure. 490126 is the same except for a round faceplate. Later versions of 490125 were labled 902-5086. Later versions of 490126 were labled 902-5023.
490123 is the rectangular EMIT with the thin magnet structure. As above, 490124 is the thin magnet structure with a round faceplate. Later versions of 490123 were labeled 902-2252. Later versions of 490124 were labeled 902-3082.
All of the diaphragms are the same, and thus interchangeable. The EMITs are easy to take apart (some Google work will show you how). Thus, when looking for replacement EMITs, look for a good looking diaphragm at a good price.