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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





Sony SSU-4000

 The SSU-4000 
Both these speakers are 3-way bass reflex systems that encompass vurtually every technological advance currently available to speaker design. While their design is very conventional, the devotion to detail is immediately apparent in the flawless way in which they effortlessly handle the entire frequency range.

Carbocon
The woofer and mid-range speaker cones are made of "Carbocon" - a carbon fiber material that is the product of the combination of hightensil carbon fiber with a particular North European cone pulp. This blend exibitis stiffness and low mass - which is required as the parameters of an ideal piston -action sound transducer. You can hear thewell controlled tight lows and the unpercedented natural presence in mid-range reproduction.

Balanced Drive Mechanism
Mid-range response is heightened by both the Balanced Drive Mechanism and the Diffuser/Equalizer The Balanced Drive Mechanism, provides for the oversized voice coil to be mounted at the cone's  center of gravity. By placing  the coil at the point where the driving masses of the outer and inner side of the cone are balanced, the cone paper's bending motion or "doubling" is greatly reduced. The results is the faithful conversion of electrical input to audio output in a wider range of frequencies.
The mid-range and tweeter "Diffuser/Equalizer" provides for a mid to high frequency response that is highly transparent and smooth. This acoustic equalizer eliminated peaks and dips better than anything yet developed.
 Advanced Woofer Design
High quality bass response is assured by Sony's advance woofer design. The woofer design concept calls for a high elastically in suspension, so that the necessary damping of the cone's movement can be achieved. A newly developed spider made  of high quality glass epoxy is used to keep linear movement in line and prevent any unwanted vibration in other modes. You end up with clean, non-fuzzy reproduction of low frequencies. Adequate damping of the woofer cone movement is further achieved with the extra powerful magnet and T-shaped pole-piece which focuses the magnetic field on the most effective area.

Advanced Tweeter Design
The SSU-4000 feature a TitanumDome Tweeter.
This tweeter has applied to its surface a 20 micron thickness of titanium foil. Titanium was selected because it's not only strong, but light enough to move fast, which is required at high frequencies.
They are also equipped with a precision cast aluminium frame, continually adjustable level control for the mid-range and tweeter, and an intricate dual-slope L/C network to smooth blend the output of the mid-range and tweeter.
Only the highest quality materials are used throughout including aluminium, cooper, high density flakeboard, double-knit grille cloth fabric, and fine, hand-rubbed hardwood veneers.
The Sony SSU-4000 (and SSU-3000) are for those who refuse to pay for gimmickry and, more importantly, demand quality and perfection.
Sony SSU-4000 Features
3-way bass reflex system with 10" cone woofer, 14" rectangular bass radiator and 3 ¼" balanced drive cone midrange
"Carbocon"  carbon fiber cone material is stiff and of low mass for  outstanding frequency and transient response.
"Balanced Drive" mid-range with oversize voice coil eliminates cone "doubling"
Buffer Board between woofer and passive bass radiator prevents internal reaction caused by standing wave effects.
Intricate Dual-Slope L/C Network blends woofer, mid-range and tweeter to reduce sharp peaks and dips.
Mid-range and tweeter "Diffuser/Equalizer" smooths peaks and dips in the mid to high freqiency range.
Newly-developed spider of glass epoxy reduces unwanted vibration in the low frequency mode, while maintaining long, linear voice coil excursion.
20 micron Titanium Dome Tweeter for transparent highs.
Precision cast Aluminum Frame keeps cone and voice coil locked in position, and reduces transfer of unwanted vibrations to cabinet.
Cabinet finished in fine, hand-rubbed multiple lacquer coatings and hardwood veneer.

Specifications
Nominal Impedance:  8 ohms
Frequency Response:  30 Hz - 20 kHz
Crossover Frequencies:  500 Hz (12 dB/oct);  5,5 kHz (6 dB /oct)
Power Handling Capability:  100 W (DIN 45500)
Recommended Amplifier Power:
Minimum :  20 watts
Maximum :  150 watts
Speaker Complements:
1 x 10" (254 mm) cone woofer
1 x 9" (230 mm ) passive Radiator
1 x 3 ¼" (80 mm) midrange driver
1 x 1" (25 mm ) dome tweeter
Midrange and Tweeter Controls:
+3 dB to -3 dB
+4 dB to -40 dB
Dimensions (H x W x D):  1192 x 343 x 361 mm (46-15/16" x 13-1/2" x 14-3/16")
Weight:  32 kg (70 lb 9 oz)

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