An acoustical speaker and planar magnetic transducer therefore wherein the transducer is provided with at least array of spaced magnets which are oriented having their pole faces at an angle with respect to a plane defining a surface of a sound producing diaphragm on which extends an electrical trace circuit. The method comprises forming a raft structure in contact with the build platform, the raft structure formed from one or more layers of material and comprising at least one removal pocket adjacent to the build platform and forming additional material in contact with the raft structure. Each of these banks is arranged only in a region where it is concealed by the light shielding film BM on the second substrate SUB2. A control circuit is provided for pulsing the solenoid at a controlled rate to alternatingly allow oil flow and halt oil flow to the bearings for a time insufficient to cause oil starvation of the bearings. This makes it possible for a CDMA radio communication system to establish initial synchronization at high speed and to improve a reduction in current consumption. The information retrieval system also uses data from the microblog data stream as well as data obtained from a microblog subscription system to compute novel and effective features for ranking fresh resources which would otherwise have impoverished representations.