  X-ray binary observations led to the interpretation that powerful compact
jets, produced in the hard state, are quenched when the source transitions to
its soft state. The aim of this paper is to discuss the possibility that a
powerful dark jet is still present in the soft state. Using the black hole
X-ray binaries GX339-4 and H1743-322 as test cases, we feed observed X-ray
power density spectra in the soft state of these two sources to an internal
shock jet model. Remarkably, the predicted radio emission is consistent with
current upper-limits. Our results show that, for these two sources, a compact
dark jet could persist in the soft state with no major modification of its
kinetic power compared to the hard state.
