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We investigate the low loss acoustic motion of superfluid 4 He parametrically coupled to a very low loss, superconducting Nb, TE011 microwave resonator, forming a gram-scale, sideband resolved, optomechanical system. We demonstrate the detection of a series of acoustic modes with quality factors as high as 7 · 10 6 . At higher temperatures, the lowest dissipation modes are limited by an intrinsic three phonon process. Acoustic quality factors approaching 10 11 may be possible in isotopicallydoi:10.1088/1367-2630/16/11/113020 fatcat:rut4hirlsbafhftv2jynp4cdp4