Laser Induced Incandescence (LII) and Particle Vaporization Velocimetry (PVV) were used to measure soot concentration and velocity in an acoustically excited combustion chamber. This acoustic burner provides a controllable environment for the study of soot formation and destruction in an unsteady flow relevant to turbulent combustion. Results are presented for a nonpremixed jet of acetylene in a coflow of air at two fuel flow rates. One condition is a laminar jet; the other corresponds to a transitional case. The acoustic forcing is shown to produce vortices that enhance entrainment and fuel-air mixing. In both jets, the acoustic forcing decreases the total amount of soot in the combustor compared to the corresponding unforced jet. However, the forcing only slightly decreases the upper range of soot concentrations present in the flame. In addition, luminosity measurements show that the average soot temperature is increased when the combustor is acoustically excited.