A sound producing device (SD) comprising: a base (BS); and at least one chip (100, 100_1, 100_2, 100_3, 100_4, 100_5, 100_6, 100', 200 or 300) disposed on the base (BS), the at least one chip (100, 100_1, 100_2, 100_3, 100_4, 100_5, 100_6, 100', 200 or 300) comprising: at least one membrane comprising a coupling plate and at least one spring structure connected to the coupling plate , wherein the at least one membrane has a plurality of outer edges defining a boundary of the at least one membrane ; at least one actuator configured to receive a driving signal corresponding to an input audio signal to actuate the at least one membrane , wherein the input audio signal and the driving signal have an input audio band (ABN) which has an upper bound at a maximum frequency (f max ); and an anchor structure connected to the plurality of outer edges of the at least one membrane ; wherein the at least one spring structure is situated between the coupling plate and the at least one actuator , and the at least one membrane has a first resonance frequency (f R ) higher than the maximum frequency (f max ); wherein the at least one membrane further comprises a driving plate on which the at least one actuator is disposed, and the at least one spring structure is connected between the driving plate and the coupling plate . a base (BS); and at least one chip (100, 100_1, 100_2, 100_3, 100_4, 100_5, 100_6, 100', 200 or 300) disposed on the base (BS), the at least one chip (100, 100_1, 100_2, 100_3, 100_4, 100_5, 100_6, 100', 200 or 300) comprising: at least one membrane comprising a coupling plate and at least one spring structure connected to the coupling plate , wherein the at least one membrane has a plurality of outer edges defining a boundary of the at least one membrane ; at least one actuator configured to receive a driving signal corresponding to an input audio signal to actuate the at least one membrane , wherein the input audio signal and the driving signal have an input audio band (ABN) which has an upper bound at a maximum frequency (f max ); and an anchor structure connected to the plurality of outer edges of the at least one membrane ; wherein the at least one spring structure is situated between the coupling plate and the at least one actuator , and the at least one membrane has a first resonance frequency (f R ) higher than the maximum frequency (f max ); wherein the at least one membrane further comprises a driving plate on which the at least one actuator is disposed, and the at least one spring structure is connected between the driving plate and the coupling plate . at least one membrane comprising a coupling plate and at least one spring structure connected to the coupling plate , wherein the at least one membrane has a plurality of outer edges defining a boundary of the at least one membrane ; at least one actuator configured to receive a driving signal corresponding to an input audio signal to actuate the at least one membrane , wherein the input audio signal and the driving signal have an input audio band (ABN) which has an upper bound at a maximum frequency (f max ); and an anchor structure connected to the plurality of outer edges of the at least one membrane ; wherein the at least one spring structure is situated between the coupling plate and the at least one actuator , and the at least one membrane has a first resonance frequency (f R ) higher than the maximum frequency (f max ); wherein the at least one membrane further comprises a driving plate on which the at least one actuator is disposed, and the at least one spring structure is connected between the driving plate and the coupling plate . <EOS>