AUDIO GAIN CHANNEL Russian patent published in 2004 - IPC

FIELD: electroacoustics and amplifier engineering. SUBSTANCE: audio gain channel has preamplifier stage and divided-load stage both built around radio tubes 3 and 10, and voice coils 13 and 14 mounted one on top of other in loudspeaker magnetic gap. Complex impedance of both voice coils 13 and 14 equals optimal internal impedance of radio tube 10. Power amplifier and loudspeaker jointly neutralize adverse effect on sound occurring at counter- electromotive force motion of voice coil thereby reducing level of nonlinear distortions. Stereo channel is incorporated. EFFECT: reduced nonlinear distortions, enhanced efficiency of loudspeaker and audio gain channel. 1 cl, 5 dwg