Compact Monitor Systems - The JBL 2450CM made exclusively for Compact Monitor Systems, which allows a light weight Neodymium 2" driver to accept the JBL D16R2482 ~ a 4" edgewound aluminum ribbon
2X JBL 2450 compression driver with 2380A HORN,,VERY VERY NICE Photo #1813734 - US Audio Mart
BRAND NEW OLD STOCK! JBL 2450J Meyer MS 2001N High Frequency Compression Driver | eBay