  We propose a conceptually and computationally simple form of sound velocity
that offers a readable view of the interference between direct and indirect
sound waves. Unlike most approaches in the literature, it jointly exploits both
active and reactive sound intensity measurements, as typically derived from a
first order ambisonics recording. This representation has a potential both as a
valuable tool for directly analyzing sound multipath propagation, as well as
being a new spatial feature format for machine learning algorithms in audio and
acoustics. As a showcase, we demonstrate that the Direction-Of-Arrival and the
range of a sound source can be estimated as a development of this approach. To
the best knowledge of the authors, this is the first time that range is
estimated from an ambisonics recording.
