To output sounds from a plurality of speakers without worsening sound quality even when the plurality of speakers are provided.
A guitar amplifier 2 includes a speaker box 3, CD player, player case 5, center speaker 6, left speaker 7 and right speaker 8. The center speaker 6 outputs a sound signal input from the outside. The left speaker 7 and the right speaker 8 output a music signal playbacked by the CD player 4. The speaker box 3 includes a front board 11, rear board 12, left board 13, right board, top board 15 and bottom board 16 and houses the respective speakers 6 to 8 in the same space. The rear board 12 shields the rear sides of the respective speakers 6 to 8. A low-pitched sound region adjustment hole 11d is formed in the front board 11. A port 19 communicating with the low-pitched sound adjustment hole 11d is attached to the front board 11.
NARITA HIRONORI
KITANISHI RYOJI
Shigeru Iijima
Kobayashi Hideyoshi
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