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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 12 TRXB

 Integrated 3-way speaker Features:
Massive die-cast frame
Viscous damped cloth suspension
Ceramic magnet
Integral Sonophase VHF driver

Incorporating  all the design advantages of the famous Electro-Voice Radex Caaxial principle, the Electro-Voice Model 12 TRXB integrated 3-way loudspeaker includes, also, the latest developments in the reproduction of the highest audible frequencies through the use of an integral Super Sonax VHF driver.
The  12 TRXB emplous the Model T35B VHF driver base response is excellent, affording pleasing musical balance without the masking effects previously experienced from extended high frequency reproduction.
 The 12 TRXB loudspeaker is designed to meet optimum listening requirements; latest developments incorporated insure even, smooth coverage of the entire listening area. The engineered features of the Electro-Voice integrated 3-way speaker system include true oncentric mounting of all reproducing elements; augmented balanced bass response in conjunction with smooth, extended high frequency reproduction, carefully tailored mid-range characteristic to provide realism and a considerable degree of "presence" at usual sound levels. The 12 TRXB incorporates in the high frequency section the Sonophase throat design.
The importance of the Sonophase throat design is paramount above 12 kc, where sound must b taken from the center of the diaphragm and the outer periphery simultaneously.
At lower frequencies, where the diaphragm is a piston, and no phase shift is required in the path configuration, the longer central path length does not appreciably change the phase due to the longer wave lengths involved. Further benefits are affored in the high frequency section of the Electro-Voice integrated 3-way speaker systems by the incorporation of Electro-Voice developed diffraction horns as the method of achieving the best dispersion. In stereophonic use especially, a 3 dB concentration of sound in one portionof the subject, with the resultant distortion of the solid or stereo effect. An adjustable "brilliance" control is incorporated to allow matching of response to room acoustic, compensating for high frequency absorptive efects of heavy drapery and soft frnishhings; crossover network with full 12 dB per octave slope minimizes distortion; edgewise-wound aluminum voice coil design affords 18% more efficiency and consequent damping of transient distortion.
Specifications:
Frequency Response:  35 to 18,000 Hz
Electrical Crossover:  Integral 3500 Hz
EIA (RETMA)  Sensitivity Rating:  52 dB
Power Handling Capacity:
Program Material :  20 watts
Peak :  40 watts
Nominal Impedance:  16 Ω
Voice Coil Diameter:
Woofer :  2 ½ inch
Tweeter :  1 inch
Magnet Weight:  1 lb 9,16 oz
Gauss: 
Woofer :  12,000 G
Tweeter :  9,000 G
Dimensions  (diam.  x  deep):  12 ¼ inch x 7 inch
Mounting:  four 9/32 holes on an 11-1/2in circle
Baffle Opening:  10 ½ inch
Net Weight:  11 lbs

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