Patent ID: 8848943

Claim:
A signal processing device for supplying sound signals to a first speaker for emitting a sound on a low-pitched sound side and a second speaker for emitting a sound on a high-pitched sound side higher than the low-pitched sound side, comprising: a volume portion that changes a gain of an output level of a sound signal supplied to the first speaker; and a control portion that includes a low pass filter which changes a characteristic of the sound signal supplied to the first speaker; and wherein an output level of the sound signal supplied to the first speaker, as determined by a user operation of the volume portion, is maintained at a crossover frequency between the first speaker and the second speaker by changing a filter order of the low pass filter based on the gain of the output level of the sound signal supplied to the first speaker being changed by the user operation of the volume portion, and wherein the crossover frequency between the first speaker and the second speaker is fixed.