I believe the 5.25 open back might be CTS drivers. At least the 137 code would suggest it.
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The CTS drivers in post 1 probably came out of an EPI microTower (a certainty if related to the EPI tweeters in post 2). The JBLs in post 3 came in a number of variations. All the ones i've had thru here needed new surrounds.
dave
Thanks dave! 3rd post i'm most certain is an Altec 421. I have another just like it but it has the white frame they used in mass production units.
Here's a massive mid-tweet. Massive motor / magnet structure.
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