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We present dynamic shear and bulk modulus measurements of supercooled tetraphenyl-tetramethyltrisiloxane (DC704) and 5-phenyl-4-ether over a range of temperatures close to their glass transition. The data are analyzed and compared in terms of time-temperature superposition (TTS), the relaxation time, and the spectral shape parameters. We conclude that TTS is obeyed to a good approximation for both the bulk and shear moduli. The loss-peak shapes are nearly identical, while the shear modulusdoi:10.1063/1.4789946 pmid:23556794 fatcat:j5kxrsyrvrfetntik3sniyhve4