This is a RE-CONE KIT for the APX-1841 18” loudspeaker.
The 1841 is intended for use primarily in subs, monitors, or low frequency instrument enclosures.
The APX-1841 incorporates a heavy cast aluminum frame basket, which resists deformation and aids in heat dissipation. The mounting specifications are standard 8 bolt and the baffle cut-out size is typical of many other standard pro audio loudspeakers.