Two 15" JBL 2216ND woofers, NIB, reduced For Sale - US Audio Mart
JBL 4367 Loudspeaker -- EACH - Dedicated Audio
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,