  Superfluid 3He has a rich spectrum of collective modes with both massive and
massless excitations. The masses of these modes can be precisely measured using
acoustic spectroscopy and fit to theoretical models. Prior comparisons of the
experimental results with theory did not include strong-coupling effects beyond
the weak-coupling-plus BCS model, so-called non-trivial strong-coupling
corrections. In this work we utilize recent strong-coupling calculations to
determine the Higgs masses and find consistency between experiments that relate
them to a sub-dominant $f$-wave pairing strength.
