Jet-Bass in a Nutshell

A Horn without Mouth ?

In 1959 Amar Bose showed us how to radiate bass down to a nominal limit of 51Hz from 22 cheap 4"-speakers which are arranged on a 1/8th-sphere within a corner. To extend the limit to 26Hz, four times the area is needed with 88 speakers, but the good characteristics appear like presents of Santa Claus to audiophiles:

lack of cut-off frequency, low attenuation from 90% to 10% within one decade (!) around the nominal limit, high efficiency, small excursions, fast transient response and equal dispersion, inherently infinite, no mouth, no reflections, no resonances, low harmonic distortion, low intermodulation, no delay.

Combining Horns

To get rid of the 88 speakers, we follow Harry Olson, who found that horns can be combined and thereby a preceding horn can herit characteristics of the following one.

Don't build a Horn within a Corner

Therefor the 1/8th-sphere with the bunch of speakers can be removed and a horn can substitute it with the mouth exactly at that place touching the walls. Unfortunately, such a preceding horn doesn't fit within the available space, which ever frequency limit is chosen. All corner horns that are built within the corner, therefor end up with compomise and a horn mouth. To avoid a mouth, the horn must not be built within a corner.

Disdained Value of the Corner Cube

The corner space behind the 1/8th-sphere towards the vertex can not only serve as a closed back chamber. It is of much higher value when employed as a retro-reflective corner cube to bend the last portion of the preceding horn therein by two or three consecutive mirrorings, similar to a cat's eye. The waves then pass some space repeatedly and this virtually provides some of the missing space for a proper horn. All trajectories then are of equal effective path-length until the joint and therefor arrive as perfect 1/8th-spheric wave fronts without distortion.

Only the Horn-Tail needs an Enclosure

The small first portion of the preceding horn emits near plain waves from a small outlet before the vertex and only this portion needs to be housed together with the speaker. Placing the outlet at a certain distance from the vertex and with a displacement from the room-diagonal, firing in parallel to the latter towards one of the walls separates the wave paths and same time avoids that waves enter back into the horn.

Invisible to the Utmost Portion

This is what essentially does the trick to generate deep bass waves with high efficiency, that popagate via the corner cube back into your room with controlled expansion and equal dispersion. Your room this way is transformed out of the corner-cube to an ideal huge, infinite invisible horn and used to deliver the deep bass you always wanted at home. No baffle is needed, no fixed mounting, it is lightweight and easy to move. Click the photo to see a more technical description.

No Resonances - Lowest Excursions - Perfect ?

The missing impedance peaks are proof of evidence that the horn is more than somewhat prolonged, but rather infinite because the described physical effects work optimally together and achieve in sum much more than each effect alone.

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Amar Bose in 1959

Harry Olson in 1940

Speakers removed

Horn loaded corner

Corner Reflections

Functional Enclosure

Jet-Bass 7", 40 Watt

In my ebook "Design of Small Sub-Bass Corner Horns" you find what you need to design and calculate horns and enclosures with tips for proper folding and proposals of realized prototypes. Media & Contact
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