JBL 2408H vs 2408H-1 Drivers

What’s the difference between the JBL 2408H and 2408H-1 drivers?

The 2408H-1 has a different phase plug as compared to the 2408H driver. It has a square phasing plug and does not have the collar that causes the screw on connector to be approx .25″ shorter than the 2408H.