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





Acoustic Research AR303a


AR 303a
More than fourty years of research and design have led to the production of this extraordinary musical component. The natural evolution of the classic 1967 AR 3aand the critically acclaimed 1994 AR 303, the new AR 303a is the pinnacle of the Acoustic Research loudspeaker line, combining reference quality sonic performance and furniture grade appearance.

The AR 303a Loudspeaker System is finished in a genuine rosewood veneer, accented by a unique gold logo and serial number plate. It features a redesigned creossover network, heavy duty 14 AWG internak wiring and bi-wire/bi-amp capability with improved gold plated 5-way binding posts.

True Acoustic Suspension technology
The AR 303a is based on Tre Acoustic Suspension design, a technology invebted by AR in 1954. a true Acoustic Suspension design uses the air inside of sealed enclosure to precisely control the excursion (back and forth movement) of the woofer cone.
The woofer cone is made of rigid felted paper, and when combined with a high compliance surround it moves like a piston. The long-throw voice coil is designed to undergo large disolscement while maintaining linearity. The compression annd expansion of air in the enclosure provides the linear restoring force to the cone. A True Acoustic Suspension design results in tight, controlled bass, excellent power handling capability and low distortion even at high output levels.


Specifications:
System Type:  3-way Acoustic Suspension
Special features: 
Filtered Soft Dome Technology ;
Vertical Symmetry Array
Frequency Response:  12 Hz - 20 kHz, ±3 dB
Driver Usage: 
For Low Frequency:  12" long-throw woofer
For Mid Frequency:  1-1/2" exposed dome midrange
For High Frequency:  3/4" exposed dome tweeter
Sensitivity:  85 dB (92,83V/M)
Impedance (nom/min): 6 Ω / 4 Ω
Power Rating: 
Minimum :  50 W/ch
Maximum :  250 W/ch
Crossover: 
650 Hz ( 12 dB/oct low and high pass)
5500 Hz (6 dB/oct - low pass; 18 dB/oct - high pass)
Dimensions (W x H x D):  14,75 x 25 x 11,19 inch
Weight:  54 lbs
Finish:  Rosewood Vener

Arcam Two Plus

 Arcam Two - Audio Monitor Loudspeakers
The Arcam series of loudspeakers from A&R Cambridge are well engineered moving coil loudspeakers which provide excellent sound quality at affordable prices. They qre the result of several years of intensive research by A&R's designers into ways of achieving outstanding musical fidelity from compact sensibly priced speaker system
Design and Construction
All three loudspeakers are classic UK two way designs, using selected tweeters and A&R designed plastic coned bass drivers. These are otimally matched to rear ported (reflex) loaded cabinets, solidly constructed from high density 18 mm board with ultra rigid 19 mm "Medite" front baffles. The larger cabinets are heavily cross braced and damped,, to minimise cabinet resonances.
The Arcam Two+ are finished in quality real wood veneers (with black as a no-cost option) the compact.  All models have attractive removable black reticulated foam grilles of high acoustic transparency.

Each speaker uses an eight element close tolerance crossover network which has been designed handle high power levels without saturation or overheating. The crossovers make use of audiophile quality components wherever appropriate, including very generously sized,, low loss inductors,, plastic film capacitors and metal oxide resistors. The printed circuit (pcb) layout of each crossover network closely approximates to that of the classic "hard wired" design.

In the case of the Arcam Two+ models,, the pcb has also been designed to permit bi-wiring, with the treble and bass section brought out to separate pairs of terminals on the speakers back  panels.
Specifications
Arcam Two+
System Design:  2-way reflex loudspeaker
Cabinet:  braced and optimally damped, constructed from 18 mm board with 19 mm Medite front baffle
Internal Volume:  14 liters
Drive Units:
One 180 mm cobex coned bass/midrange
One 20 mm soft dome tweeter
Crossover:  8 element, crossover frequency 3,0 kHz, 12 dB/octave
Connections:  Bi-wirable, 4 mm socket on back panel
Frequency Range:  42 Hz - 20 kHz
Impedance Modulus:  8 Ω nominal ( 6,5 Ω minimum)
Sensitivity:  88 dB/watt nominal, measured at 1 metre
Amplifier Compatibility:  15 - 70 W under normal operating conditions
Finish:  Walnut veneer or black  with black reticulated foam grille.
Dimensions (W x H x D):  223 x 378 x 280 mm (8,8 " x 14,9" x 11,0")
Weight:  8,2 kg (18") each

Arcam Three plus


Arcam Three - Ultra compact audio monitor loudspeakers

The Arcam series of loudspeakers from A&R Cambridge are well engineered moving coil loudspeakers which provide excellent sound quality at affordable prices. They qre the result of several years of intensive research by A&R's designers into ways of achieving outstanding musical fidelity from compact sensibly priced speaker system

All three loudspeakers are classic UK two way designs, using selected tweeters and A&R designed plastic coned bass drivers. These are otimally matched to rear ported (reflex) loaded cabinets, solidly constructed from high density 18 mm board with ultra rigid 19 mm "Medite" front baffles. The larger cabinets are heavily cross braced and damped,, to minimise cabinet resonances.
The Arcam Three+ is offered with a well finished walnut or black ash type vinyl wrap. All models have attractive removable black reticulated foam grilles of high acoustic transparency.

Specifications
Arcam Three+
System Design:  2-way reflex loudspeaker
Cabinet:  solidly constructed from 18 mm board with 19 mm Medite front baffle
Internal Volume:  8 liters
Drive Units:
One 135 mm polypropylene coned bass/midrange
One 14 mm dome/cone tweeter
Crossover:  8 element, crossover frequency 3,5 kHz, 12 dB/octave
Frequency Range:  47 Hz - 20 kHz
Impedance Modulus:  8 Ω nominal ( 5 Ω minimum)
Sensitivity:  88 dB/watt nominal, measured at 1 metre
Amplifier Compatibility:  15 - 50 W under nrmal operating conditions
Connections:  4 mm socket on back panel
Finish:  Walnut or black ash vinyl with black reticulated foam grille.
Dimensions (W x H x D):  181 x 341 x 236 mm (7,1 " x 13,4" x 9,3")
Weight:  4,8 kg (10,6") each

Musical Fidelity A2 CD

 Musical Fidelity A2CD
Features:
Selectedmechanism and printed circuit boards
Sophisticated low jitter reclocking circuit
High quality Class A low impedance output stage
Remote control
Bitstream converter system
Standard 440 mm width
Random play function
Edit function
32track programming
Optical and coaxial digital outputs

Benefits:
Top level sonic performance and consistency
Greatly improved sound quality, imaging and tonality
High quality consistent sound with great presence and authority
Convenient operation from the listening position
Increased sound quality with smoother response and lower distortion
Matches the majority of alternative components
Plays back all tracks on the disc in arandom order
Allows easy taping of different tracks to best fit tape length
You can listen to the tracks you want in the order you prefer
Enables connection of external
Digital-to-Analogue converters or digital amplifiers
Specifications:
Frequency Response:  20 Hz - 20 kHz ±1dB
Signal-to-Noise Ratio:  better than -105 dB
Dynamic Range:  better than 95 dB (1 kHz)
Harmonic Distortion:  0,009% (1 kHz)
Wow and Flutter:  not measurable (Quartz accuracy)
Channel Separation:  better than 92 dB (1 kHz)
Output Analog:  2,0 V RMS
Output Digital:  0,5 Vp-p / 75 Ω  (coaxial)
D/A Converter:  8-times oversampling
Analog Filter:  4 pole CHV filter
Pick-up Type:  2D parallel objective lens drive, 3 beam laser pick-up
Laser Type:  GaAlAs semiconductor laser
Wavelength:  760-805 nm
Power Consumption:  10 watts
Dimensions (W x H x D):  440 x 95 x 340 mm
Weight:  5,1 kg
Standard Accessories:  Remote control handset