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EV 1829 drivers - plug the back?

Posted by BofService (A) on December 8, 2015 at 16:35:15

I picked up a pair of old beat up EV monitors, and in them were a pair of EV 1829 compression drivers. They appear to have 1 1/4 inch ID outputs (1 3/8 threaded OD), with an additional 1 1/4" threaded output on the back as well. As received the rear output was plugged with foam and a red plastic cap, similar to as shown in the pictures on the auction site.

A little research shows these drivers were designed for reentrant or diffraction horns, and are sometimes used as replacements on Leslies. In their intended horns the claimed FR can be 140hz to 11,000hz.

Does anyone have experience with these? If attempting a hi-fi application should they be run with the back capped?

Thanks,

Gary

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