Omni-Directional Loudspeakers:





The facts:

Mango Electronics has developed a range of high quality, cylindrical loudspeakers that are omni-directional in operation and exhibit very low sound colouration even at high acoustic levels. The virtues inherent in their design result in a considerable increase in the perception and enjoyment of live and recorded music.

Several models are available, each suited to a different purpose or environment - Hi-fi in the pool house or outside on the patio, musical instrument reproduction, discotheques, public address or even acoustical research.

Ranging from compact units designed for use in small rooms such as saunas, to monsters using 24" diameter drivers rated at 2,000 watts aimed at the modern music venue. All models exhibit amazing electro-acoustic efficiencies of up to 101dB/W and even the domestic versions are capable of "disco level" should anyone require it!

The common feature of all the designs is the operational principle (the subject of a patent application) combined with some of the finest drivers currently available.

These are the first loudspeakers in the world which are omni-directional and really WORK!

By very careful design, the stuctural-mode resonances of the cabinet and the air-mode resonances inside the cabinet are both suppressed, preventing the the colouration of the reproduced sound that is inevitable with all conventional "box" loudspeakers - even those using advanced aero-space type materials in their construction aimed at preventing cabinet resonance.

The enclosure provides optimum loading for th edrivers and enables exceptionaly fast attack and decay therby enhancing all types of reproduced music. It is this feature that accounts for the uncanny "disapearance" of the loudspeakers from the acoustic sound field during operation the total lack of listener fatigue.

The design simulates a point source over a wide frequency range covering a full 360 degree about the vertical axis and +/-120 degrees about the horizontal plane through the simulated source. This eliminates the "armchair effect" that conventional loudspeakers exhibit, where only one listener is able to experience good stereo at the mid-point between the loudspeakers. A stereo sound field exists over a very wide area and some truly amazing stereo imaging in free space results from the use of four units running in "crossed stereo" mode.

Conventional compact loudspeakers generally rely an tuned ports to augment the acoustic output of the bass driverby providing an oscillating "slug" of air. This is very carefully arranged to have a neutral oscillation frequency just below that of the driver, thus, as the output energy from the bass driver is falling, the output energy from the port is rising. Some recent so called "sub-bass" designs use several "chambers" and adjustable tube ports to provide additional resonant sections in an attempt to extend the response down even further in frequency and flatten out the acoustic energy. The point about these techniques is that, whilst they unboubghtably increase bass energy output, they do so at the expense of detail. In no way can any of these units be discribed as Hi-Fi wiith regard to reproduction of bass frequencies.

A simple analogy that can be used to illustrate this effect, is that of air oscilating in a bottle. As most people know, by blowing across the open end of a bottle a resonant note is generated, this tends to take a short while to actualy "build up" and it continues sounding for quite some time even after the energy input, (i.e. the blowing) has ceased.

In a working loudspeaker this reasults in lost detail, since the initial transients present in a bass "event", such as a drum beat, are largely lost whilst the resonance is growing aand then furthe obscured because the system carries on chucking out bass energy long after the electrical input to the driver has ceased for the event in question.

*****************RESULT SIMILAR TO TURBO LAG******************

We have gone on about the above at some length in order to emphises our belief that both domestic and proffesional loudspeaker design has gone down a blind alley of late, reasulting in designs that, whilst being compact, are "woolly" sounding at the bottom end and tiresome to listen to for any length of time.