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<problem time_order="1" frequency="70" time_method="fixed" time_method_tolerance="0.05" matrix_solver="umfpack" coordinate_type="axisymmetric" mesh_type="triangle" time_steps="2" name="Cylindrical subwoofer" time_total="1.0">
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<field field_id="acoustic" initial_condition="0.0" polynomial_order="2" number_of_refinements="2" time_skip="0.0" analysis_type="harmonic">
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<adaptivity adaptivity_type="disabled" adaptivity_back_steps="0" adaptivity_redone_each="0" adaptivity_tolerance="1" adaptivity_steps="1"/>
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<solver linearity_type="linear" picard_anderson_acceleration="1" newton_automatic_damping="1" picard_anderson_beta="0.2" picard_anderson_vectors="3" newton_damping_coeff="1" newton_damping_number_to_increase="1" nonlinear_steps="10" nonlinear_tolerance="0.001"/>
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<boundary acoustic_normal_acceleration_real="10" acoustic_normal_acceleration_imag="0" type="acoustic_normal_acceleration" id="1" name="Source +">
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<boundary acoustic_normal_acceleration_real="-10" acoustic_normal_acceleration_imag="0" type="acoustic_normal_acceleration" id="2" name="Source -">
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<boundary acoustic_normal_acceleration_real="0" acoustic_normal_acceleration_imag="0" type="acoustic_normal_acceleration" id="3" name="Sound hard wall">
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<boundary type="acoustic_impedance" acoustic_impedance="1.25*343" id="4" name="Matched boundary">
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<material acoustic_speed="343" acoustic_density="1.25" id="1" name="Air">
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