H04R 122, H04R 124, H04R 312
Electro-acoustic transducer arrangement are disclosed in which the tendency to diaphragm distortion between the drive and suspension positions is reduced and the efficiency as well as linear characteristics are improved especially at lower frequencies. A loudspeaker arrangement has an externally electrically driven transducer and one or more additional transducers pneumatically coupled therewith. Such additional transducer or transducers can be suspended in the same chassis as the electrically driven transducer. An additional transducer can be suspended in a separate chassis in the same enclosure as the electrically driven transducer or in a separate enclosure connected by an acoustic transmission line with that containing the electrically driven transducer. A pneumatically driven diaphragm can actuate an electromechanical transducer the output of which is used to drive another transducer and/or to modify or control its own movement and/or that of the diaphragm of the electrically driven transducer. The relative sizes of the transducer diaphragms, their weights, their form, their suspension, the voice coil, size, weight and impedance, as well as the load values applied to the voice coils and the field strength of the associated magnet systems, will determine the frequency ranges handled by each of the pneumatically operated transducers. In this and various other embodiments of the invention, these factors are distinctively different among the various speakers, with the result that the frequency ranges of the various speakers will be different, although they may overlap. Thus the driven speaker may have a full frequency range, while the pneumatic one or ones may correct e.g. the bass or the top. The pneumatic speaker or speakers control the acoustical characteristics of the enclosure or cabinet, to improve efficiency at specific frequencies, which can be narrow bands or wide bands.
patent: 2403232 (1946-07-01), Parisier
patent: 3155774 (1964-11-01), Howell
patent: 3275758 (1966-09-01), Bryan et al.
patent: 3612741 (1971-10-01), Marshall
patent: 3772466 (1973-11-01), Hossbach
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