Acoustics – Diaphragm – Mounting or suspension means
Patent
1982-09-28
1984-04-03
Fuller, Benjamin R.
Acoustics
Diaphragm
Mounting or suspension means
181156, 1791155ES, H05K 560
Patent
active
044402600
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a bass-reflex loudspeakersystem comprising a cabinet having a front plate which is provided with a substantially circular aperture or hole for the mounting of a bass loudspeaker or woofer and with a bass-reflex port in the shape of an annular slot around said speaker, said bass-reflex port being formed of the intermediate space between a first tubular member fixedly mounted to the front place and a second tubular member mounted inside of and coaxially with said first member.
BACKGROUND ART
For many years there has been made efforts to develop loudspeaker enclosures or cabinets which were in acoustical sense totally dead, also in replaying pieces of music at very high sound levels. After all, the purpose is to achieve a neutral reproduction of the electrical signals conducted to the loudspeaker system without colouring the sound picture due to cabinet resonances or other interfering noise sources. This problem has hitherto been solved in many different ways.
Thus, it is known to manufacture enclosures or cabinets of heavy or thick blockboards and further to brace them by means of strong bars. This is a fairly good but costly method, because wood of this quality is expensive. It is also a known method to manufacture the enclosure or cabinet as a double-walled box of e.g. chip board and then fill out the space between the outer and inner box with sand so that the cabinet obtains a considerable weight. In acoustical sense this is an excellent solution because the cabinet by this measure can be kept absolutely in rest. For such goods, however, which have to be transported over long distances, maybe in more than one stage, and which, moreover, have to be stored in large numbers of specimens, this weight is of a prohibitive nature. The same applies to those constructions of concrete or marble which have been disclosed recently in the litterature.
DISCLOSURE OF INVENTION
According to the present invention a bass-reflex loudspeaker system has bee provided in which the bass loudspeaker or woofer is fixedly secured to said second tubular member in an end directed towards the open and in which said second tubular member in said end is mounted to said front plate by means of vibration absorbing, machanical mounting means for the provision of a substantially vibrationless front board or baffle.
Based on commonly known technique in the art the above mentioned combination of measures now permit the manufacture of loudspeaker systems in cabinets or enclosures which are far more acoustically dead than hitherto and yet retain the thickness of the boards traditionally used for the side walls of the cabinet. Further, that kind of distorsion in the medium frequency and high frequency ranges which is due to the Doppler effect from the low frequency loudspeaker or woofer is also avoided. A thickness reduction of the plates or boards would on the contrary not be permissible as the pressure conditions in the air inside the speaker cabinet do not change by the new mounting of the woofer.
BRIEF DESCRIPTION OF DRAWINGS
For the purpose of illustration of this invention, there is shown in the accompanying drawings, a preferred embodiment thereof. It is to be understood that these drawings are for the purpose of example only and that the invention is not limited thereto. In the drawings:
FIG. 1 is a vertical section of the loudspeaker system of the invention which section contains the speaker axis of the woofer and those details which concern the mounting of the speaker indirectly on the front board or plate of the cabinet;
FIG. 2 is a front view of the same as in FIG. 1;
FIG. 3 is a sectional view taken on the line A--A of FIG. 2.
MODES FOR CARRYING OUT THE INVENTION
The front plate or board of the loudspeaker enclosure or cabinet is designated by the reference number 10. In the drawings only those details are shown which are related to the special manner in which the woofer is mounted according to the invention because the design of the remaining part of the enclosure is irr
REFERENCES:
patent: 1742016 (1929-12-01), Staunton
patent: 3757890 (1973-09-01), Dunning
patent: 4298087 (1981-11-01), Launay
Fuller Benjamin R.
Jamo Hi-Fi A/S
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