PURPOSE: To realize proper gain distribution for amplifiers for an intermediate/ high sound range and low sound rage by installing a sound volume controller which gradually reduces the output of the low sound range when a sound output from right or left channel is increased by a variable resistance.

CONSTITUTION: After sound signals Lch and Rch at the right or left and inputted to and amplified by amplifiers 1L and 1R through variable resistances B and C respectively, they are reproduced by speakers 5L and 5R. The signals Lch and Rch through the resistances B and C are inputted to a low sound amplifier 3 through a variable resistance A and reproduced by a speaker 4 after signals in the prescribed intermediate/high sound range removed by an LPF 2. The resistance A is constituted in such a way that it is interlocked with the resistances B and C, and set to low output contrary to the resistances B and C set to high output. Thanks to this constitution, the output of the low sound becomes greater than that of the intermediate/high sound range when a reproduced sound volume is comparatively small. On the other hand the output of the low sound becomes smaller when the reproduced sound volume is large.