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The nonasymptotic critical properties of sound propagation are studied in compressible Ising system above Τ. In the present paper we analyse a model where in addition to the coupling to two order-parameter fluctuations tle sound mode couples linearly to the fluctuations of spin-energy and lattice-energy densities. Both subsystems exchange energy with the rate determined by the bare spin-lattice relaxation time: The total energy may be conserved or not. The crossover between insulator-likedoi:10.12693/aphyspola.92.449 fatcat:qgzxfxduzjaslnmfzbxxf3gqqq