A low-frequency loudspeaker is provided consisting of an enclosure with an entrance, a back and the sidewall. An opening is made at the front of the enclosure to accommodate an audio speaker. The speaker is equipped with an diaphragm that produces front sound waves which are transmitted outwardly through the diaphragm, and back sound waves which are transmitted to the enclosure through the diaphragm. The enclosure has an encasement that is a spiral. The spiral waveguide is fitted with a first end proximal to the diaphragm of the speaker to assist in receiving the back sound waves, and then extends outwards in a spiral pattern to a second end that creates a low-frequency an exit port in the sidewall.

Field of the Invention

The present invention pertains to the reproduction of sound in the low frequency region. In particular, it is it is a smaller method of constructing what is commonly known as a loudspeaker with transmission line.

Description of the Related Art

Wireless technologies such as Bluetooth have seen a significant rise in the number of wireless portable speakers. However, the sound quality of a majority of these systems, particularly in the low frequency range, leaves much to be wanted. Subwoofers specifically designed for low-frequency sound require large-coned, heavy boxes and large speakers. In order to produce high-quality low-frequency sounds, a large and heavy speaker system is typically required.

In this regard it is necessary for a compact, light weight portable system of speakers that does not sacrifice sound quality in the low-frequency range.

It is , therefore, an aim of this invention to provide a light-weight and compact speaker system that produces good sound quality while minimizing the negative effect of group delay.

These objects are met with the invention of today, which provides an extremely low-frequency spiral guide inside the portable system of speakers. The new technique has the same high-quality sound as traditional transmission line speakers but offers additional benefits. It makes a novel type of loudspeaker enclosure which is small and features improved sonic characteristics.

The spiral waveguide permits constant redirection of sound waves without sudden shifts in direction. This is unlike 90 degree or 180 degree folded lines which can create turbulent conditions. Because the spiral waves provide an effective and longer acoustic line and minimal pressure attenuation, it is more efficient. The result is a compact enclosure for a low-frequency transducer that provides greater efficiency as compared to a sealed box design while retaining its superior time domaincharacteristics and by a reduction in back EMF (an undesirable by-product present in all moving coil transducers.)

The cabinet’s size can be reduced by its compact design and the large taper ratio of the spiral waveguide. It’s comparable in size with many enclosures for loudspeakers. The bracing action of the inner spiral allows for smaller material to be used to create bigger sides. This eliminates unwanted resonances that result from enclosure excitation pressures. This design is able to achieve the same low frequency rolloff rate similar to a sealed-box design however, it does not cause excessive delay in the group. This design is similar to port speakers in that it achieves greater efficiency and a longer low-frequency output. However, the flow-resistive nature spiral unlike a straight port tube, helps to reduce the negative consequences of infrasonic conductivity.

One preferred embodiment of the invention includes a low-frequency speaker that includes an enclosure that has an entrance, back and sidewall. A gap is cut in the enclosure’s front to allow for the installation of an audio speaker. A speaker for audio is fitted with a diaphragm, which generates front sound waves, which are transmitted outwardly through the diaphragm, and back sound waves which are transmitted to the enclosure by the diaphragm. A spiral waveguide is located inside the enclosure. The spiral waveguide is constructed with one end that is proximal to the speaker diaphragm for receiving the back sound waves. It extends upwards from that point in a spiral pattern to a second end which forms a low-frequency out port that is located in the sidewall.

The low-frequency loudspeaker could also include at least one (a plurality) speakers mounted in a corresponding one or more openings in a front-facing section of said sidewall. The exit port for the low-frequency terminus port can be found within the sidewall that faces upwards. It can be flared to facilitate an easy transition between high pressure sound waves as well as a listening area with the acoustic’s impedance of a different.

To control unwanted large panel resonances due to excitation pressure inside, the spiral waveguide may extend beyond the enclosure, and then be tied together at the back. Damping material can be affixed to the outer surface of the spiralwaveguide. In addition, fibrous damping materials may be located in the enclosure to create an acoustic viscosity that helps to control infrasonic cone motion and also improves the effectiveness of the guide.

The space at the front edge of the spiral waveguide could be adjusted to match the area of the diaphragm of the speaker at low frequencies. The ideal is that the internal space between the enclosure’s back and front is equal to +/-20% of a low frequency speaker piston.

Preferably, the spiral waveguide starts with a wide area between the first winding and next winding. This area narrows as winding progresses, to the point where the exit port is smaller areas.

Another alternative allows two speakers to be mounted behind each other in open spaces. This embodiment also includes the spiral waveguide, which consists of a primaryspiral waveguide with a length of 3.5 meters and a shorter secondary waveguide that is inserted between the windings in the primary spiral waveguide.

According to a further version of the invention one or more additional speakers can be placed in one or more openings in the rear of the speaker. The spiral waveguide in this embodiment may also acts as the sidewall ofthe enclosure. This embodiment of the enclosure may be egg-shaped. An egg-shaped enclosure can be placed in an upright position. This results in a longer waveguide, which reduces the tuning frequency and increases the performance of speakers. The egg-shaped enclosure should ideally be offset by 45 degrees.

The above and other items, features and advantages of the present invention will be evident from reading the drawings that follow and the an in-depth description of the most preferred embodiments of the invention.

Click here to view the patent on USPTO website.


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