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It was used mostly in pro applications.

I think he may mean Harman.

http://www.harmanpro.com/

Hello Sebackman,
When you talk about the 1" version do you mean this http://reconingspeakers.com/product/jbl-jrx-prx600-sf-replacement-horn-lens-338800-001?
Thanks,
-Steve

I picked up a pair of these in pretty good shape. Is there anything to be gained by swapping in a pair of 2426H drivers that are just sitting on my shelf? Also, is there anything gained by using one...