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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





Coral CX-77 loudspeakers

12-inch 3-way 3-speaker system

Symmetric Paired Cabinet Systems - Enclosure

The higher the performance of the speakers, the more important the quality of their enclosure becomes. The CX-77 system uses a bass-reflex enclosure, which features a highly condensed multi-layer particle board, eliminating unwanted vibration. The side, baffle and back boards are strongly reinforced. Ester wool, Tetoron wool and soft felt, all with excellent sound properties, are used as acoustic material. The speakers are symmetrically mounted to achieve optimum directivity. Beautifully finished with UVD coating, the CX-77 system enclosure symbolizes the perfection of the system.

 


Woofer

The light, tough cone paper ensures optimal linearity.

Proper balance among tweeter, squawker, and woofer is crucial when assembling a good speaker system. Cone paper, the heart of the woofer, must possess high Young's modulus and be fully flexible. The woofer in the CX-77 speaker system features Coral's own specially developed micro-crystal cone paper, the surface of which is coated with fine hollow crystal grains 0,1 mm in diameter and with a specific gravity of 0,3. thus partial vibration has been greatly enhanced, refining the transient characteristics of the lower and bass ranges. The rest of it, too - the free edge with full linearity, diecasting frame absolutely without resonance, powerful magnetic circuit help - all contribute to some of the richest, most listenable low frequency sounds available.

 

Squawker

Titanium dome ideally shaped to overcome molding difficulties.

Coral, having developed its own exclusive method for loading highly rigid titanium speaker domes, is now able to provide the audiophile with the most superb mid-range speakers ever. The voice coil in these speakers features CCAW winding and flawlessly maintains optimum balance of mass, extending the high range limit ans largely improving transient characteristics. The aluminum bobbin boasts large input resistivity, and a spacious back cavity easily expands the Frequency Response of the lower range to efficiently cover everything from 700 Hz to 7,000 Hz. Clear, faithful sound.

 

Tweeter

A super-tweeter with a super-high limit - 40,000 Hz

The ultimate limit of high-frequency sound reproduction, plus the elimination of distortion and the optimum in transient characteristics. The attainment of these goals is what audio engineers are continually stribing toward - to build a tweeter which will flawlessly reproduce the delicate high-range sound properties of every musical instrument. Coral's is a hard dome-type super-tweeter that uses a diaphragm of 18-micron-thick ultra-thin Super Duralmin having a crossover frequency of 7,000 Hz. The expanded high-range frequency response of 40,000 Hz easily reproduces everything within the normal audible frequency of 20,000 Hz with outstanding directivity. The sound quality is amazing.

 

Level Controller

An attenuator that enables continuous variation of the mid- and high-frequency ranges independently. The levels may be easily regulated simply by removing the front Saran cloth net.

 

Dividing Network

Low-loss design employing a Mylar film capacitor and a coil featuring a high permeability reluctance ferrite core, which refuses to cause linear distortion even under large input. The design brings out the maximum transient characteristics of each speaker, the result being thoroughly well-balanced sounds.

 


Specifications

Enclosure:  Bass-reflex type

Speakers

1 x 300 mm Woofer

1 x 50 mm titanium dome squawker

1 x 20 mm hard dome tweeter

Frequency Response:  30 - 40,000 Hz

Crossover Frequency:  700 Hz ; 7,000 Hz

Output Sound Pressure Level:  94 dB

Program Source Input:  80 W

Impedance:  8

Dimensions (W x H x D):  390 x 650 x 320 mm

Weight:  22 kg


 

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