Abstract: An improved efficiency loudspeaker that increases the accoustical output of the speaker by increasing its amplitude without increasing the power input to the speaker. This is accomplished by doubling the amplitude of displacement of a speaker diaphragm. The sound power of the speaker is thus increased by a factor of four. This is accomplished by utilizing a pair of voice coils which are reverse wired to each other so that both voice coils drive the diaphragm speaker. Thus, one voice coil pushes the diaphragm while the other pulls the diaphragm. This essentially doubles the acceleration of the diaphragm, therefore, doubling the velocity per unit time and thereby doubling the amplitude displacement per unit time. An even more efficient configuration is obtained by using two sets of these wired in parallel where sound power is increased 8 (eight) to 10 (ten) times.