Natural sound circuit for acoustic reproduction of speech and music for hi-fi stereo systems has additional loudspeakers deriving difference signal from plus and minus poles of stereo outputs

摘要

The circuit transmits sound over two reproduction channels and six loudspeakers with a natural quality using two pairs of loudspeaker in addition to the main loudspeakers connected to the left and right loudspeaker outputs. The additional loudspeakers are connected in series to derive a difference signal from the plus and minus poles of the right and left stereo output signals that is passed to the additional pairs via a common current bridge.