The C5/BU/W is a complete loudspeaker assembly consisting of a 8C5PAX - 8 O.D....The C5/BU/W is a complete loudspeaker assembly consisting of a 8C5PAX - 8 O.D. dual cone loudspeaker with a 5 oz. magnet a TBLU - 5W-25/70V transformer and a volume control mounted on a BR8W - round steel screw mount baffle.more