Claims
- 1. In a loudspeaker system an improvement for use in combination with a loudspeaker system which includes:
- a. a vibratable cone having an open apex; and
- b. a speaker enclosure having a top, a bottom, a back, a pair of sides and a front, the front having a speaker opening wherein the vibratable cone is mechanically coupled so that it may vibrate in response to an electrical signal, said improvement is a device for effectively enlarging the volume of the speaker enclosure in order to increase the compliance that the vibratable cone sees with said device comprising:
- a. a gas having a gamma value less than 1.4 and the product of its density and the square of speed of sound therein less than the same product for air; and
- b. a bag formed from a soft, pliable material for enclosing said gas within the speaker enclosure and adapted to seal said gas therein and to seal atmospheric gases and water thereout;
- c. an acoustically transparent and porous cocoon disposed about said bag so that it surrounds completely said bag; and
- d. an acoustical padding disposed adjacent to the top, the bottom, the back, the sides and the front of the enclosure and adapted to enclose said acoustically transparent and porous cocoon.
- 2. In a loudspeaker system an improvement for use in combination with a loudspeaker system according to claim 1 wherein said gas is produced by heating a fluid in its liquid phase and said device also comprises means for heating said fluid.
- 3. In a loudspeaker system an improvement for use in combination with a loudspeaker system according to claim 2 wherein said means for heating said fluid is a fibrous, sound absorbent material disposed within said bag and adapted to heat said fluid by excitation created by sound pressure changes.
- 4. In a loudspeaker system an improvement for use in combination with a loudspeaker system according to claim 2 wherein said means for heating said fluid is a resistive electric element which is disposed within said bag and which utilizes externally supplied electrical energy.
- 5. An improvement for use with a loudspeaker system according to claim 2 wherein said means for heating said fluid is a resistive electric element which is disposed without said bag and which utilizes externally supplied electrical energy.
- 6. In a loudspeaker system an improvement for use in combination with a loudspeaker system which includes:
- a. a vibratable cone having an open apex; and
- b. a speaker enclosure having a top, a bottom, a back, the back having a venting opening to provide a direct air path to the rear of the vibratable cone, a pair of sides and a front, the front having a speaker opening wherein the vibratable cone is mechanically coupled so that it may vibrate in response to an electrical signal, said improvement is a device for effectively enlarging the volume of the speaker enclosure in order to increase the compliance that the vibratable cone sees with said device comprising:
- a. a gas having a gamma value less than 1.4 and the product of its density and the square of speed of sound therein less than the same product for air; and
- b. a bag formed from a soft, pliable material for enclosing said gas within the speaker enclosure and adapted to seal said gas therein and to seal atmospheric gases and water thereout;
- c. an acoustically transparent and porous cocoon disposed about said bag so that it surrounds completely said bag; and
- d. an acoustical padding disposed adjacent to the top, the bottom, the back, the sides and the front of the enclosure and adapted to enclose said acoustically transparent and porous cocoon so that said bag, said cocoon and said padding does neither interfere nor close off the direct air path to the venting opening from the rear of the vibratable cone.
Parent Case Info
This patent application is a continuation-in-part application of a U.S. Pat. application filed by the inventor on Mar. 17, 1977, having Ser. No. 778,429 and entitled A Device For Increasing the Compliance of a Speaker Enclosure, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
2718931 |
Boudouris |
Sep 1955 |
|
3385929 |
Magyar et al. |
May 1968 |
|
4044855 |
Kobayashi |
Aug 1977 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
778429 |
Mar 1977 |
|