The LF9 pro is a very high performance dual 18-inch horn loaded subwoofer that incorporates the advantages of the very successful Lloyd Lee Co. pro subwoofers into a compact yet powerful subwoofer that delivers outstanding low frequency performance.
A derivative of the LF7, the LF9 pro design utilizes the unique double sub-horn cabinet construction with two B&C woofers to ensure chest-kicking low frequency, extremely long-term power handling and reliability in all applications.
This design behaves like a horn over much of its range, but without the time delay and weight problems usually associated with conventional designs. 
Vented-box advantages take over for the lowest octave and assist in producing exceptionally high levels of clean, punchy bass from a modest-sized box.
The LF9 pro subwoofer uses a new, longer, four-layer aluminium voice coil woofer; the result is more force, higher sensitivity, lower distortion and better overall performance.

The reverse woofer orientation has been used to optimize the rear chamber volume and decrease the horn flare rate for extended low-end performance. 
When configured with the MH9 pro, EDGE-X XLA7, XLA9 or EXTREME RED+ mid-high speaker systems, the LF9 pro provides high output full range sound reinforcement for large halls and outdoor events. 
Although the LF9 pro was designed for use with the ELAN and EXTREME systems, it may be used to add to the bass performance of various Lloyd Lee Co. speaker systems.

The LF9 pro rectangular cabinet can be easily ground stacked in multiples to increase low frequency directivity and level. 
When two speaker systems are placed side by side, the woofer cones mutually couple, causing the two systems to act as one system with twice the effective cone area at very low frequencies, giving an additional 3dB increase in maximum acoustic output.