This Bogen Ceiling Speaker Assembly is a pre-assembled 8 ceiling mounted speaker for your 70V or 25V commercial audio system. The speaker is sold complete with transformer 8 S810 cone and grille cover. Variations of this speaker include white or off-white finish recessed or knob-style volume control dials screw-terminal bridge or bare wire connections (double check the model before ordering). The speaker is easily installed into drop-ceilings features a 4W capacity and a 70Hz to 15kHz frequency response suitable for paging and background music.