Bass Driver (2216Nd-1) from JBL Synthesis 4367 Photo #4079220 - Canuck Audio Mart
JBL Professional - What's inside the JBL Professional M2 Master Reference Monitor? The annular design of the D2 diaphragms reduces distortion along with the 2216Nd Differential Drive Woofer, not your "off-the-shelf" woofer,