這是一款基於 JBL 375 型號設計，適用於大型廳堂及劇院音效重現的驅動單體。透過結合 Alnico V（鋁鎳鈷）磁鐵 的強大磁路與 鑽石懸浮（diamond suspension）振膜，使其即便身為大口徑單體，頻率響應仍能平滑地延伸至 18kHz 的高頻。這種鑽石懸浮設計具有與捲邊（roll edge）相當的均一品質與可靠性，並採用 JBL 原創的振動系統支撐結構，實現了超越切線邊（tangential edge）的線性表現。此外，音圈部分採用了鋁製扁平線（aluminum ribbon）。
A driver unit suitable for large halls and theater sound reproductions based on the JBL 375 model. By combining the powerful magnetic circuit of the Alnico V magnet with the diamond suspension diaphragm, the response is smoothly expanded to the high range of 18kHz even though it is a large-diameter driver. The diamond suspension has a uniform quality and reliability comparable to that of the roll edge, and has JBL’s original vibration system support structure that achieves linearity that surpasses the tangential edge. Aluminum ribbon is used for the voice coil.