A speaker includes a box-shaped enclosure, a speaker unit and a sounding board. A pair of side plates, a bottom plate, a top plate, a back plate and a baffle are assembled into the enclosure. The speaker unit is attached to an opening portion of the baffle. The sounding board is attached to the bottom plate, and includes a member having a fiber direction in a vibration direction of a vibrating plate, a member having a fiber direction in a direction which approaches the side plate (of the front side) as extending from a side of the back plate to a side of the baffle, and a member having a fiber direction in a direction which approaches the side plate (of the back side) as extending the side of the back plate to the side of the baffle.
1. A speaker comprising:
a box-shaped enclosure into which a first side plate, a second side plate, a bottom plate, a top plate, a back plate and a baffle with an opening portion are assembled;
a speaker unit that is attached to the opening portion such that a vibrating plate of the speaker unit faces to the outside of the baffle; and
a sounding board that is attached to the bottom plate or an inner surface of the top plate and includes a first member having a fiber direction in a direction which approaches one of the first side plate and the second side plate as extending from a side of the back plate to a side of the baffle,
wherein the sounding board further includes a third member having a fiber direction in a direction which approaches the other of the first side plate and the second side plate as extending from the side of the back plate to the side of the baffle.
2. The speaker according to claim 1 , wherein the sounding board further includes a second member having a fiber direction in a vibration direction of the vibrating plate.
3. The speaker according to claim 2 , wherein the second member is arranged on a substantial center of a width direction of the bottom plate or the top plate, and the first member and the third member are arranged such that the second member is sandwiched between the first member and the third member.
4. The speaker according to claim 2 , wherein the sounding board further includes a fourth member attached to the first to third members and having a fiber direction in a direction which approaches the first side plate as extending from the side of the back plate to the side of the baffle, and a fifth member attached to the first to third members and having a fiber direction in a direction which approaches the second side plate as extending from the side of the back plate to the side of the baffle.
5. The speaker according to claim 4 , wherein the lengths of the fourth and fifth members are shorter than those of the first to third member.
6. The speaker according to claim 5 , wherein the fourth and fifth members are attached on a middle portion of the longitudinal direction of the first to third members such that the fourth and fifth members are away from an end portion of the side of the back plate and an end portion of the side of the baffle of the first to third members.
7. The speaker according to claim 1 , wherein the bottom plate or the top plate is a wooden plate cut from solid wooden, and the bottom plate or the top plate has a grain direction crossing the vibration direction of the vibrating plate.
8. The speaker according to claim 1 , wherein the sounding board is made of bamboo bonded block.
9. The speaker according to claim 1 , further comprising:
a terminal plate that is attached to the back plate; and
a duct for bass reflex that is attached to the back plate,
wherein the terminal plate is arranged on the lower side of the back plate and the duct is arranged on the upper side of the back plate.