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,
JBL 2216ND Woofer for JBL M2 #5041785 - Speaker Exchange
2216Nd Projects
2216Nd-1 Measurements??
JBL 2216ND-1 15" woofers for JBL 4367 for sale online | eBay