  The vibrational properties of 2H-TaSe$_{2-x}$S$_x$ ($0 \le x \le 2$) single
crystals were probed using Raman spectroscopy and density functional theory
calculations. The end members revealed two out of four symmetry-predicted Raman
active modes, together with the pronounced two-phonon structure, attributable
to the enhanced electron-phonon coupling. Additional peaks become observable
due to crystallographic disorder for the doped samples. The evolution of the
E$_{2g}^2$ mode Fano parameter reveals that the disorder has weak impact on
electron-phonon coupling, which is also supported by the persistence of
two-phonon structure in doped samples. As such, this research provides thorough
insights into the lattice properties, the effects of crystallographic disorder
on Raman spectra, and the interplay of this disorder with the electron-phonon
coupling in 2H-TaSe$_{2-x}$S$_x$ compounds.
