The acoustical/physical parameters like density (ρ), ultrasonic velocity (U) and viscosity (η) have been experimentally measured for the ternary liquid mixture of p-anisaldehyde (PA) +dimethylamine (DMA)+ n- Hexane at various temperatures such as 303 K, 308 K and 313 K and at fixed frequency of 2 M Hz. The variation of experimental ultrasonic velocities with respect to different concentrations ranging from 0.001 M to 0.01 M at different temperatures have been discussed with reference to molecular interactions. The theoretical studies like Van-Dael Ideal Mixing Relation (IMR), Impedance Dependant Relation (IMP), Junjie’s (JUN) and Nomoto’s (NOM) relations are validated with respect to experimental velocities at 303 K, 308 K and 313 K for all the different concentrated solutions of p-anisaldehyde+dimethylamine + n- hexane. The least deviation in experimental velocity with respect to each temperature is determined while comparing with computed theoretical velocities which are based on those theories and the Chi-square test for the goodness of fit is also applied to check the validity of such theories.