Acoustic transducer comprising a plurality of coaxially arranged diaphragms

An acoustic transducer comprising:

• a housing;
• a plurality of diaphragms separated into one or more groups in which the diaphragms in at least one group of diaphragms are connected to each other by rods in which at least some of the rods pass through openings in the diaphragms, wherein the diaphragms with openings comprise components that resist or diffuse air passing through the openings;
• and
• one or more motors that operate in response to an electrical signal;
• wherein
• the diaphragms of each group are driven by a respective motor to which all the diaphragms in the group are coupled, wherein
• the plurality of diaphragms includes two groups of diaphragms and the one or more motors includes two motors, each motor actuating diaphragms in a respective group, and wherein the two groups of diaphragms are driven in opposition to one another.

An acoustic transducer comprising:

• a housing;
• a plurality of diaphragms separated into one or more groups in which the diaphragms in at least one group of diaphragms are connected to each other by rods in which at least some of the rods pass through openings in the diaphragms, wherein the diaphragms with openings comprise components that resist or diffuse air passing through the openings;
• and
• one or more motors that operate in response to an electrical signal;
• wherein
• the diaphragms of each group are driven by a respective motor to which all the diaphragms in the group are coupled, wherein
• two or more of the diaphragms are each suspended from the housing by a suspension and the suspensions for the two or more diaphragms have different properties or orientations.