  The determination of the speed of sound in quark-gluon plasma is a crucial
aspect of understanding the properties of strongly interacting matter created
in relativistic heavy-ion collisions. In this study, we investigate the impact
of initial-state fluctuations on the extraction of the speed of sound in a
quark-gluon plasma in the ultra-central collisions. By employing the TRENTo
model for simulating initial conditions, we demonstrate that these fluctuations
lead to sizable volume effect, which in turn corrects the measured values of
the sound velocity. With respect to realistic conditions of high-energy
heavy-ion experiments, we provide quantitative estimate of these corrections.
