Profile: OAP Audio Products is associated with professional loudspeaker systems. The NF-331HP stair riser speaker utilizes fringe field maximization in the three LF-drivers. The drivers are optimized by incorporating two high energy 1 oz. neodymium dics at the top & bottom of the circuit that redirects and focuses unproductive fringe magnetic fields back into the magnetic gap producing maximum flux density. The CH1-1000 speaker is designed specifically for use in low ceiling applications. The C-1 speaker uses a 12-inch woofer with 1-inch exit horn and driver coax mounted. This coax supplies low frequencies as well as the far field high frequency reproduction.