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Newton's 3rd Law! Wall Mounted Speakers & Newton's Third Law of Motion Newton's third law of motion has been expressed in a variety of ways; one expression of it is as follows: For everyaction there is an equal and opposite reaction ;or the mutual actions of two bodies upon each other are always equal and directed oppositely. When the law is expressed specifically in terms of two objects and the forces which they exert on each other the law may be restated as follows: When one object exerts a force on a second object, the second object exerts an equal but opposite force on the first object. One force is called theaction force; the other force is called the reaction force. Newton's third law has an interesting and perhaps unanticipated effect on the sound of loudspeakers. In a loudspeaker theaction may be thought of as the motion of the diaphragm, cone with attached coil, or planar film with attached coil, or electrostatically driven film or whatever. The diaphragm in the case of a moving coil, cone loudspeaker, and the attached coil carry an electron flow from the amplifier which interacts with a stationary magnet, steel pole piece structure, which in turn is attached to a frame, which in turn is attached to the loudspeaker enclosure, which in turn generally rests on the floor or on speaker stands which rest upon the floor. Theaction is the coil carrying cone moving air either in a forward direction toward the listener, or in the other direction, in response to a negative going electrical wave-form. The equal and oppositely directed reaction force is the force directed on the stationary magnet metal pole piece structure, and therefore on all the connected structures, the frame, speaker enclosure, and so forth. The supposedly stationary parts of the loudspeaker system are therefore also driven by a force or an energy of a magnitude equivalent to the force driving the cone and therefore producing the movement of air molecules which is the sound produced by the loudspeaker. A conventional loudspeaker system, resting on speaker stands, or directly on the floor, or upon shelves is therefore in a constant state of random,action reaction motion over and within the entire structure. More importantly, the reaction force, which is vibrating the supposedly stationary magnet, frame and box structure system, imparts in turn a vibrating, constantly changing motion upon theaction system, the air moving, amplifier driven coil, diaphragm system. This action , reaction , interaction, does not have an accurate, linear, musical relationship with the music signal produced by theaction on the driven coil, diaphragm system. The interaction signal is a form of distortion, a kind of intermodulation distortion, as the mechanical vibration of the reaction system is reintroduced into the coil, cone motion which in turn produces the air motion heard as sound. For some time now, rather indirect solutions have been sought for this problem, such as penetrating floor carpet cones. This interaction force is not easily directed into the floor, as that flow of energy would represent a right angle transformation of the force itself, downward into the floor. A conventional box loudspeaker system is therefore in constant, interactive motion, with motion reintroduced into the air moving coil cone system which is not representative of the original electrical signal driving the loudspeaker, or of the direct, mechanicalaction produced by the electrical signal. The conventional loudspeaker system, resting upon the floor, or speaker stands is therefore subject to a complex of introduced distortion, produced by the interaction of the action , reaction forces of the electron flow, air molecule transduction itself. The interaction force, produced as a consequence is a form of musical information altering distortion, which acts to obscure and mask fine detail within the musical information structure. Ameliorating the bad effects of the Third Law The American Power & Light transducers attach directly to a very large, structurally massive room boundary element, a wall, which in turn is a structural component attached to the entire house. Furthermore, the speakers do not simply rest at right angles upon a room boundary, as a conventional loudspeaker does rest upon a floor. The speaker is attached to the wall, and is co-planar with the wall, and cannot move in very small increments toward and away from the listener facing the loudspeaker; the rigid, attached room wall itself prevents that motion. The entire weight of the speaker rests upon a top mounted bracket which attaches to a single screw assembly in the wall. Energy transfer from the inevitable action , reaction , interaction force is therefore easily made into the massive, rigidly co-planar room boundary wall; the interaction energy is therefore not available as a music information, signal obscuring force, masking fine detail within the musical information structure. The result of good mechanical physics is an immediately remarkable improvement in musical clarity and in the reproduction of fine detail, especially in the critical midband and high frequency spectrum, within which fine detail is contained.