I appear to have purchased a JBL "537-510" exponential horn off eBay, but I haven't been able to find any other information about it (and I have looked through the library here, many thanks).
My intention is to experiment with it; I have a pair of 375's (actually, a disassembled Sovereign I/S8R) but I wish to experiment with different horns on the 375's. I do have a pair of the later JBL Pro version of the 537-509.
Mike Squires
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