audio-controlled loudspeaker monitor

audio-controlled loudspeaker monitor What started out simply as a universal audio-controlled switch for an active loudspeaker has grown into a fully fledged monitor. This has come about because during the development it was found useful to have a temperature sensor for the heat sinks in the output stages; then it was felt that a supply voltage monitor could easily be added, and a DC sensor for the speaker input levels, and soft-start switching of the mains supply, and ... It is not just the enclosure, the drive units, the amplifiers, and the active cross-over filters that make a complete active loud- speaker unit. It is true that when these parts are put together properly the resulting unit can produce beautiful sounds. Before it can do so, however, the cassette deck, the record player, and the pre-amplifier have to be switched on manually. It is surely more convenient to have automatic switch on. Some pre-amplifiers provide a control voltage over the audio cable, which enables a ...