We investigate the damping experienced by quartz tuning fork resonators in normal and superfluid ³He as a function of their resonance frequency from 22 kHz to 250 kHz and contrast it with the behavior of the forks in ⁴He. For our set of tuning forks the low frequency damping in both fluids is well described by the existing hydrodynamic models. We find that the acoustic emission becomes the dominating dissipation mechanism at resonator frequencies exceeding approximately 100 kHz. Our results show that the acoustic emission model used in ⁴He fluid also describes acoustic damping in superfluid ³He and normal ³He at low temperatures using same geometrical prefactor. The high temperature acoustic damping in normal ³He does not exceed prediction of this model and thus the acoustic damping of moderate frequency devices measured in ⁴He should be similar or smaller in ³He liquid.