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RE: GPA/Altec 902 all the way down to 500Hz?

For the simple reason that Altec, JBL, etc., are single element drivers relying on well controlled diaphragm/suspension break-up modes for their HF BW while the BMS is a coaxial, so an apples n' oranges comparison. The others can be made to extend this high, but must have a horn designed to do it and even then CD horn EQ is required, at least on the Altec/GPA units if horn loaded for other than tweeter apps.

Anyway, it will be interesting to see how an Altec/GPA, JBL, or similar driver measures on these somewhat compromised 'rubber throat' tractrix horns. From what you've presented though, seems like it's been optimized for the 2" BMS or similar, so apparently the one to buy if extreme HF SQ is a major issue.

As always though, YMMV. ;^)


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