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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





B&W 203i

Bowers & Wilkins serie200
Floor-standing loudspeaker system

Product Summary
The 200 series was deemed as the rarity in the mass consumer hi-fi market – a reasonably priced loudspeaker that provided high sensitivity, extended linear frequency response and pinpoint stereo imaging.
The 203i is a fourth order low-pass vented loudspeaker system. The speaker comprises of a 3/4-in high frequency with a polyamide dome and one 7in low frequency polypropylene cone.
The B&W wall bracket accessory permits easy, multi-directional positioning on walls.

Technical highlights
The Design incorporates a cabinet profile and wedge shaped grilles on acoustically transparent frames.
The magnetic fluid-cooled voice coils are a B&W hallmark, wound on glass reinforced Kapton® formers, enabling the drivers to take the heat when reproducing modern digital recordings.
In common with all B&W tweeters, the lightweight units incorporate low viscosity magnetic fluids to offer excellent power handling and linearity


Specifications
Drive Units:
1 x 19 mm (3/4") high-frequency with polyester dome
2 x 180 mm (7") low frequency with polypropylene cone
Frequency Range:  40 Hz -22 kHz (-6 dB points)
Bass Loading:  Fourth-order vented alignment
Dispersion:  20 Hz -20 kHz
Vertical :  ±2 dB over 10° arc
Horizontal :  ±2 dB over 40° arc
Distortion (for 90 dB at 1 m):
Second Harmonic :  less than 1% (20 Hz to 300 Hz)
Third Harmonic  :  less than 1,5% (20 Hz to 300 Hz);  less than 1% (300 Hz to 20 kHz)
Crossover:  Third-order low-pass; Second-order high-pass
Frequency Response:  47 Hz – 20 kHz ±3 dB on reference axis
Sensitivity:  90 dB spl(2.83V 1m)
Nominal Impedance:  4 Ω 
Power Handling:  95W DIN suitable for amplifiers up to 180W RMS
Dimensions (W x H x D): 720 x 225 x 257mm
Weight:  9 kg (20 lbs)
Finish:  Simulated veneers of black ash
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