A loudspeaker system having a dual voice coil for radiating sound waves from a multiple channel system. A processor of the first device automatically interprets the pattern of taps as a command from a plurality of tap pattern-based commands. Algae is filtered from the fuel by way of an algae treatment unit and a filter assembly. A displaceable transmission mechanism is driven by the actuator and moved in a slot in a base from a first position in which the head retraction mechanism is contacted and a second position in which an ejection mechanism is contacted.