Abstract: A cable for conducting electronics signals in proximity to a source of electromagnetic interference, the cable has at least one longitudinally extending conductive wire having a diameter and an outer surface and a spacing member substantially coaxially disposed around the at least one wire and having a diameter and an outer surface, wherein the ratio of the diameters of the spacing member and the wire is about 4:1 and the spacing member contains no EMI shielding constituent.

Abstract: A cable for conducting electronic signals in proximity to a source of electromagnetic interference, the cable comprising:

Abstract: A home hearing test for use with a conventional home audio system comprising an audio player and a set of headphones connected to the audio player. The home hearing test includes an audio medium such as a compact disc playable in the audio player and containing a calibration tone recorded at a predetermined decibel level and a number of prerecorded sequences of tones. Each sequence has tones recorded at different decibel levels and decreasing by a step value. In a first sequence for obtaining a rough estimation of hearing threshold level, the tones start at 70 dB HL and decrease by 10 dB steps to 0 dB HL. In secondary sequences, tones start and end with tones from the first sequence and decrease in 2 dB steps. The home hearing system includes a calibration device for calibrating the output of the audio system to the ears of a person wearing the headphones against the predetermined decibel level of the calibration tone.

Abstract: A circuit for coupling a 2- or 4-channel audio deck to 2- or 4-speakers in a car stereo audio system to increase the signal level output without raising the supply voltage or increasing the noise. The circuit comprises unity gain inverting and non-inverting amplifiers each connected in one of four channels, with the outputs combined to provide left and right channel outputs for series connection, respectively, to the left and right channel speakers.