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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Electro-Voice T35B Driver

 

 Super Sonax Very-High-Frequency Driver

The human ear delights in the variety of sounds resulting from the widest range reproduction. This wide range response delivers also the subjective illusion of reality. Extended high-frequency response in the last audible octaves is made necessary still more in the accomplishment of musical balance with the augmented bass range of present speaker systems of the folded corner horn and phase loaded type. Here fundamentals of the first audible octave require flat response in the high range to the limit of audibility, or aesthetic appreciation of the source material suffers from unconscious listener fatigue caused by the imbalance.

These needs have resulted in intensive research by Electro-Voice physicists and engineers to the end that new principles and new techniques have evolved a superior series of VHF drivers which have overcome range and sensitivity limitations.

 

The improved T35B, and T35 Super-Sonax, very-high frequency drivers are designed to complement all Electro-Voice speaker systems, and systems of alternative manufacture, when smooth, efficient, extended response is desired past 3500 cps. These drivers have specialized integral horns of the diffraction type which afford wide dispersion. This dispersion characteristic is especially valuable in stereo or binaural reproduction, where even distribution of sound energy throughout the listening area is a requisite to preserve the proper aural horopter.

 

The Hoodwin Diffraction Horn

All Electro-Voice drivers employ diffraction horns as the recommended method of achieving the best dispersion. In stereo work especially, a 3 dB concentration of sound in one portion  of the room is sufficient to cause apparent displacement of the subject, with resultant distortion of the "solid" or stereo effect.. This changes the aural perspective so necessary to the preservation of the illusion of reality, and smooth dispersion insures duplication of the original sound source depth and width. The spatial relationship of the original sound source to the axis of the two ears is termed the aural horopter, and an even sound distribution, coupled with balancing the levels of both right and left speakers is insured through the diffraction principle.

 

Voice Coil Assembly

By using a diaphragm assembly of practically indestructible phenolic-impregnated linen, radial splitting, buzzing and modular breakup are eliminated. Because reproduction of the extreme high frequencies is mass-controlled, the self-supporting voice coil has no heavy coil form and is therefore practically weightless, providing extended high-frequency response.

 

Specifications

Frequency Response:  3,500 - 19,000 Hz ±2 dB

Recommended Crossover:  3500  Hz

RETMA Sensitivity Rating:  57 dB

Polar Pattern:  180 ° dispersion

Power Handling Capacity

Program :  50 watts

Peak :  100 watts

Nominal Impedance:  16 Ω

Voice Coil Diameter:  1 inch

Magnet Weight: 7 oz

Gauss:  13,500

Size

Horn :  5-1/4" long x 2" wide

Pot Diameter :  2-1/4" max.

Depth :  3-1/4" overall

Baffle Opening:  1-3/4" x 4-1/4"

Weight (Shipping):  3,5 lbs

 

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