Loudspeaker with power amplifier in cabinet - has separate feedback amplifier connected to additional voice coil

摘要

The loudspeaker amplifier circuit is supplied by a power amplifier (19) with output connected to one voice coil (21) and a rectifier (26) with T-junction link to a smoothing capacitor (27). Negative feedback is provided between the loudspeaker (25) diaphragm (24) and the amplifier (19) through a feed-back amplifier (23) follows the power amplifier proper (19). The same nominal signal is applied to both amplifier (19, 23) inputs, and an actual signal is in addition applied to the feed-back amplifier (23) derived from the diaphragm (25). The feed-back amplifier (23) is connected to a second additional voice coil (22).