JP2006203697A - Amplifier pedestal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an amplifier base that can not only acoustically perform insulation between an amplifier and a floor by a damping mechanism, such as a spring member so as to prevent acoustic wave vibration from a speaker body of the amplifier from directly transferring to the floor, but also enhance the acoustic characteristics of the amplifier, by effectively and positively utilizing the acoustic wave vibration downward from the speaker body of the amplifier. <P>SOLUTION: The amplifier base comprises a top plate 2 having an amplifier mounting area 21 on the top face and a through hole 22 to the bottom face in the amplifier mounting area 21, a pair of side plates 3 arranged across the through hole 22 so as to leave a gap 31 at a rear end and expand to both sides toward the front on the bottom face of the top plate 2, a bottom plate 4, arranged under the top plate 2 via the both side plates 3 to form a resonant hollow 6 which cooperates with the top plate 2 and the both side plates 3 to penetrate in an anteroposterior direction and expands to the both sides toward the front, and a vibration-absorbing legs 5 arranged on the bottom face of the bottom plate 4 and stably mounting the bottom plate 4 with the members thereon integratedly over the floor 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an amplifier base for mounting an amplifier with a speaker such as a guitar amplifier to enhance the acoustic characteristics of the amplifier.

  When the amplifier is installed directly on the floor surface, the sound wave vibration generated in the amplifier's speaker body is directly propagated into the air, while being transmitted to the floor etc. to vibrate them and secondarily propagated into the air. Therefore, both interfere with each other, and the acoustic characteristics of the amplifier are deteriorated. In order to solve such a problem, the amplifier is usually placed on an appropriate amplifier base when used, thereby preventing sound wave vibration from the speaker body from being directly transmitted to the floor.

  Conventionally, for example, a wooden rectangular frame or a box is appropriately substituted as the amplifier base, and a dedicated “GRAMMA” acoustic insulation base (manufactured by Auralex Acoustic Co., USA) is also commercially available. Can suppress resonance by raising an amplifier or the like from the floor.

On the other hand, in Japanese Patent Laid-Open No. 10-304484, in order to improve modulation distortion and reduce floor vibration by separating the mechanical vibration transmission relationship between the speaker box and the floor, the speaker box is placed between the floor and the floor. An insulator in which a vibration absorbing member such as spring steel is interposed is disclosed. Japanese Patent Application Laid-Open No. 11-194760 also discloses that a floor surface and a speaker are provided in order to reduce the adverse effects on the sound quality and the distortion of the vibration waveform of the sound wave by giving the speaker placed on the floor a degree of freedom of vibration. A support for musical instruments or speakers is disclosed in which a load bearing member made of a spring material that can be elastically deformed is disposed therebetween.
JP-A-10-304484 JP-A-11-194760

  The conventional amplifier base can acoustically insulate between the amplifier and the floor surface by a damping mechanism such as a spring member so that sound wave vibration from the speaker body of the amplifier is not directly transmitted to the floor. In these amplifier stands, there is no viewpoint or idea for improving the acoustic characteristics of the amplifier by effectively and positively using sound wave vibrations downward from the speaker body of the amplifier.

  An object of the present invention is not only to acoustically insulate between the amplifier and the floor surface by a damping mechanism such as a spring member so that sound wave vibration from the speaker body of the amplifier is not directly transmitted to the floor, It is an object of the present invention to provide an amplifier base that can effectively and positively use a sound wave vibration downward from the speaker body to enhance the acoustic characteristics of the amplifier.

  The amplifier base according to the present invention has an amplifier mounting area on the upper surface, an upper plate having a through hole to the lower surface in the amplifier mounting area, and a front surface with a gap at the rear end on the lower surface of the upper plate. A pair of side plates arranged with a through hole so as to expand on both sides toward the opposite side, and arranged below the upper plate via the both side plates, and in cooperation with the upper plate and both side plates in the front-rear direction A lower plate that forms a resonance cavity that penetrates the front and expands to both sides toward the front, and vibration that is disposed on the lower surface of the lower plate and stably installs the lower plate on the floor surface together with the members on the lower plate It consists of an absorbent leg.

  A cloth material may be provided on the lower surface of the upper plate so as to cover the through hole entirely or partially. In addition, a reinforcing member may be bridged between the upper plate and the lower plate at a position outside the resonance cavity.

  There are no particular limitations on the materials of the upper plate, the side plate, the lower plate, and the reinforcing member, and for example, metal, wood, pulp compression-molded, etc. can be suitably used. The side plate usually has a flat surface, but may have a curved surface or a composite surface of the flat surface as necessary. Furthermore, a known mechanism using, for example, a spring material, a vibration absorbing property, a vibration damping property, a resonance preventing material, or the like can be adopted for the vibration absorbing leg portion.

  According to the amplifier base according to the present invention, it is only possible to acoustically insulate between the amplifier and the floor surface by a vibration control mechanism such as a spring member so that sound wave vibration from the speaker body of the amplifier is not directly transmitted to the floor. In addition, the acoustic characteristics of the amplifier can be enhanced by effectively and positively utilizing the acoustic vibrations downward from the speaker body of the amplifier and propagating it forward through the through-hole through the resonance cavity.

  In addition, when the cloth is disposed on the lower surface of the upper plate so as to cover the through hole entirely or partially, acoustic characteristics corresponding to the covering mode of the through hole, the sound absorption characteristic of the cloth, and the like can be obtained. .

  Furthermore, when the reinforcing member is bridged between the upper plate and the lower plate at a position outside the resonance cavity, more stable support of the amplifier can be obtained.

Hereinafter, the present invention will be specifically described based on examples.
1 is a perspective view of an amplifier base according to the present invention, FIG. 2A is a plan view of the amplifier base shown in FIG. 1, FIG. 2B is a front view of the amplifier base shown in FIG. 1, and FIG. FIG. 2 is a bottom view of the amplifier base shown in FIG. 1. FIG. 3 is a chart showing an example of a frequency spectrum showing the transmission frequency characteristic obtained by placing the guitar amplifier on the amplifier stand shown in FIGS. The same chart as FIG. 3 about the case where the amplifier base in which cloth material is not arrange | positioned by the lower surface of an upper board is used in the amplifier base shown in FIG. 2, FIG. 5 has mounted the guitar amplifier directly on the floor surface. It is a chart similar to FIG.

[Configuration of amplifier stand]
1 and 2, an amplifier base 1 is mainly composed of an upper plate 2, a pair of side plates 3, a lower plate 4, and a vibration-absorbing leg 5, and as a whole, the width is 630mm, the length is 340mm, and the height is 110mm (the leg 5). )).

  The upper plate 2 is made of a wooden plate material having a plate thickness of 15 mm, has an amplifier mounting area 21 on the upper surface, and has a through hole 22 with a diameter of 120 mm on the lower surface in the amplifier mounting area 21. The pair of side plates 3 is made of a wooden plate material having a plate thickness of 25 mm, and a through hole 22 is sandwiched between the lower surface of the upper plate 2 so as to leave a gap 31 having a width of 20 mm at the rear end and expand forward on both sides. Is arranged in. The lower plate 4 is made of a wooden plate having a thickness of 25 mm. The lower plate 4 is disposed below the upper plate 2 via the both side plates 3 and cooperates with the upper plate 2 and both side plates 3 in the front-rear direction. A resonance cavity 6 that penetrates and expands to both sides toward the front is formed. Further, the vibration-absorbing leg portion 5 is disposed on the lower surface of the lower plate 4 so that the height can be finely adjusted at each vertex position of a triangle substantially corresponding to each end portion of each side plate 3, and in the width direction. The anti-resonance mechanism using a spring material is provided at two locations, and the anti-resonance mechanism using a rubber material is provided at the remaining one location, and the lower plate 4 is stably installed on the floor surface 7 together with the upper member. I am letting.

  A cloth material 8 is detachably disposed on the lower surface of the upper plate 2 so as to cover the through hole 22 in its entirety, and each of the upper plate 2 and the lower plate 4 is provided on the outer side of the resonance cavity 6. The reinforcing member 9 is bridged at each corner on the side where the side plate 3 is not interposed.

[Comparison test of acoustic characteristics]
A guitar amplifier with built-in speakers (Fender Twin Reverb, US Fender, 100 W output) is installed in the studio, and a microphone is placed 50 cm in front of it, and a Marantz audio computer “AX1000” is connected to them. The sound absorption panels are arranged on both sides of these measuring devices, the acoustic characteristics in each case are measured, and the frequency indicating the transmission frequency characteristics with the sound pressure level (dB) as the vertical axis and the frequency (Hz) as the horizontal axis of the logarithmic scale. A spectrum was obtained. 3 shows a case where the guitar amplifier is placed on the amplifier base 1 shown in FIGS. 1 and 2, and FIG. 4 shows an amplifier in which the cloth material 8 is not disposed on the lower surface of the upper plate 2 in the amplifier base 1 shown in FIGS. FIG. 5 shows the frequency spectrum when the guitar 1 is placed directly on the floor surface 7 without using the amplifier table 1.

  When comparing the frequency spectrum shown in FIGS. 3 to 4 when the amplifier base 1 according to the present invention is used with the frequency spectrum shown in FIG. 5 when the amplifier base 1 is not used, the frequency spectrum of 8 Hz or less and A large change is observed between the two in a frequency range of 250 Hz or higher, particularly 1 KHz or higher. Moreover, the frequency spectrum shown in FIG. 3 when the cloth material 8 according to the present invention is disposed on the lower surface of the upper plate 2 is used, and the frequency material shown in FIG. Comparing with the frequency spectrum shown in FIG. 4 in the case of using the amplifier base 1 that is not disposed on the lower surface, a clear change is generally recognized between both in a frequency range of 2 KHz or higher.

FIG. 1 is a perspective view of an amplifier base according to the present invention. 2A is a plan view of the amplifier base shown in FIG. 1, FIG. 2B is a front view of the amplifier base shown in FIG. 1, and FIG. 2C is a bottom view of the amplifier base shown in FIG. FIG. 3 is a chart showing an example of a frequency spectrum showing the transmission frequency characteristic obtained by placing the guitar amplifier on the amplifier stand 1 shown in FIGS. 4 is a chart similar to FIG. 3 in the case where an amplifier base in which the cloth material is not disposed on the lower surface of the upper plate is used in the amplifier base shown in FIGS. FIG. 5 is a chart similar to FIG. 3 when the guitar amplifier is directly placed on the floor surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Amplifier stand 2 Upper plate 3 Side plate 4 Lower plate 5 Leg 6 Resonance cavity 7 Floor 21 Amplifier mounting area 22 Through-hole 31 Gap

Claims (3)

An amplifier mounting area on the upper surface, an upper plate having a through-hole to the lower surface in the amplifier mounting area, and a clearance on the lower surface of the upper plate, leaving a rear end and expanding to both sides toward the front A pair of side plates arranged with a through hole in between, and the both side plates arranged below the upper plate through the front and rear plates in cooperation with the upper plate and the both side plates and toward the front An amplifier comprising: a lower plate that forms a resonance cavity that expands on both sides; and a vibration-absorbing leg that is disposed on the lower surface of the lower plate and that stably installs the lower plate on the floor surface together with members on the lower plate Stand. The amplifier base according to claim 1, wherein a cloth material is disposed on the lower surface of the upper plate so as to cover the through hole entirely or partially. The amplifier base according to claim 1, wherein a reinforcing member is bridged between the upper plate and the lower plate at a position outside the resonance cavity.

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