FIELD: acoustic equipment, in particular, resonance multiple-mode sound sources. SUBSTANCE: resonance multiple-mode sound source has upper maximal working frequency fmax, jackets of height h, elasticity modulus E, Poisson ratio ν. material density ρ, cellular structure core with cell size lcell. Cell size lcell is less than 
EFFECT: decreased acoustic distortions caused by local resonance in cells of panel core. 3 cl
