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We show that there are two types of acoustic monopoles, namely the pressuremonopoles (PMs) and the velocity monopoles (VMs). Under one wave incidence,only the pressure field near a PM at resonance possesses monopolar symmetry,while for a VM at resonance only the velocity field possesses monopolarsymmetry. It is the dipolar response function of the monopoles that dictateswhether they are PMs or VMs. A hybrid monopolar device with neither velocitynor pressure field symmetry is also demonstrated by combining a VM and a PM,which exhibits two monopole resonances with neither PM nor VM symmetry. Thebreaking of symmetry could lead to higher absorption of the subwavelength scaledevices.

Acoustic Pressure Monopole, Velocity Monopole, and Hybrid Monopole