Abstract: A speaker system includes a vertically oriented elongated tube supported on a ground surface, and open at upper and lower ends thereof; a woofer, mid-range speaker and tweeter mounted at a lower end of the tube, the woofer having a front driving face with an effective driving area, the woofer providing an in-phase audio signal directed upwardly through the tube and an out-of-phase ground wave audio signal directed in an opposite direction therefrom; an enclosure enclosing the woofer and mounting the tube on the ground surface; a restricted open area formed between a lower edge of the enclosure and the ground surface and being less than the effective driving area, the restricted open area being arranged to transmit the out-of-phase ground wave audio signal from the woofer in a direction transverse to the axial direction; and a driving circuit for driving the woofer and including a power amplifier for amplifying an input signal with a variable gain and supplying the amplified input signal to the woofer, a circu

Abstract: A method of varying the brain state of a person includes the steps of supplying the first audio signal to one ear of the person, supplying a second audio signal to the other ear of the person, and substantially continuously varying the frequency of at least one of the first and second audio signals to vary the brain state of the person.

Abstract: A method and apparatus for improving visual acuity during sports activities includes the steps of increasing the strength of the image on the brain half corresponding to the weaker eye of a person by substantially occluding ambient light to the dominant eye of the person for a period of approximately one to two weeks for at least one hour per day; forcing both brain halves to operate at substantially equal visual levels in coordination with each other by wearing eyeglasses having inner opaque sections adjacent the nose bridge so as to limit overlapping vision of the two eyes to a small overlapping area, the inner opaque areas being inwardly and downwardly inclined at an angle of approximately 20 with respect to a nasal axis extending through the nose of the person; and forcing both brain halves to operate independently of each other at substantially equal visual levels by increasing the areas of the opaque sections so as to eliminate the overlapping area, which forces each brain half to process the visual inf