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





Yamaha HP-3 headphones

Yamaha invites you to enjoy a private word of musical enjoyment. Light, and with the gentlest of ear-pad pressures, the HP-3 headphones are a transparent window on the world of music.
Wide frequency response and low distortion combine to give a clear and uncolored reproduction superior to the finest loudspeakers. And you can enjoy the full, shattering sound levels of hard rock, or grand opera, without disturbing those around you. They also assure faithful and delicate reproduction of a whispered vocal, or a solo violin. Orthodynamic design is the secret.
With the HP-3 you may well forget that you are wearimg headphones. But you will never forget the thrilling realism that they bring to your private musical enjoyment.

Specifications;
Type:  Orthodynamic Type
Impedance:  150 Ω
Diaphragm Diameter:  46 mm
Sensitivity:  93 dB/mW, 101 dB/V
Max. Continuous Input:  1 W
Max. Input: 3 W
Weight: 210 g (with cord)


Tannoy Mercury F4



Features:
F4 utilises a 1-inch  (25 mm) Nitro-urethane layer-damped woven polyester dome tweeter and a powerful neodymium magnet assembly.
Two 6,5-inch (165 mm) Bass drivers utilise extremely lightweight multi-fibre coated pulped paper cone offering exceptional rigidity.
Finish is available in apple wood or dark oak vinyl veneer
Recommended amplifier power from 10 to 140 Watts RMS

Specifications
Enclosure Type:  Front reflex braced encloseure
Drivers
High Frequency :  25mm (1.00") soft dome tweeter
Low Frequency:  Two x 165mm (6.50") bass driver
Frequency Response (at 3dB):  35 Hz to 20 kHz
Amplifier Power Range:  10 to 140 watts / channel
Crossover Frequency:  2.7 kHz
Maximum Power Handling:  200 watts / cannel
Sensitivity:  91 dB
Impedance:  8 Ω
Effective Volume:  40.0 Litres
Weight:  13.5 Kg
Finish:  Apple Wood or Dark Oak



Pioneer SX-990 Receiver


AM/FM Multiplex Stereo Receiver
 Never has any receiver combined such exceptional high performance with so many audiorefinemental a full 100W at 8 ohms over a frequency response from 10 to a fantastic 100,000 Hz Advanced solid state circuitry with Field Effect Transistor and Integrated Circuits and a 4-gang variable capacitor - for significantly superior sensitivity and limiting. Two tuning meters, an unusually wide range of inputs and outputs, precise tone controls and a host of important innovations. Meticulously engineered. Stunningly styled. Truly one of the finest audio components ever created.
Features
High-performance FM Tuner
An FET (Field-Effect Transistor) is used in the radio-frequency amplifier to attain a high sensitivity and selectivity. Further, four ICs (Integrated Circuits) are used for the intermediate frequency amplifier to eliminate interference and noise.

 Built-In Excellent FM MPX Circuit
This switching circuit having excellent separation and frequency response is built in for reproduction of reality music.

 Built-In Highly-Sensitive Ferrite Antenna for AM Radio Reception
The ferrite antenna provides high-sensitivity reception of AM broadcast programs.

Special Curcuitry for Versatility
The high output given by strictly selected transistors, two sets of loudspeaker terminals and phono terminals, and the provision for using a microphone make Model SX-990 suitable for the professional use as well as the family use.

A variety of Accessories
Accessories include the program lamps that indicate the program being played, the tuning meters vertically arranged for facilitating selection of an FM broadcast program, the loudspeaker selector switch, tape monitor switch, etc, all for enjoyable use of Model SX-990.


Specifications
Audio Section
Circuitry:  Single ended push pull
Semiconductors:  25 Transistors; 5 Diodes
Music Power Output (IHF Rating):
100 watts total at 8 Ω
130 watts total at 4 Ω
Continous Power Output
Each channel driven:  35 W / 35 W at 8 Ω
Both channel driven :  28 W + 28 W at 8 Ω  (30 W + 30 W at 4 Ω )
Total Harmonic Distortion:  less than 0,5% (at 1 kHz rated output)
Frequency Response:  10 Hz tp 100 kHz ±3 dB ( Overall)
Power Bandwidth:  15 Hz to 40 kHz (AUX)
Hum and Noise:
Mag :  better than 80 dB
Aux :  better than 100 dB
Input Sensitivity/Impedance:
Magnetic Phono :  3,3 mV / 50 k Ω
Ceramic Phono :  24 mV / 100 k Ω 
Microphone :  5 mV / 100 k Ω
Tape Monitor :  200 mV / 100 k Ω
Aux :  200 mV / 100 k Ω
Main In :  530 mV / 100 k Ω
Output Terminals Impedance:
Speakers :  4 to 16 Ω
Equalization Curves:  Phono RIAA
Tone Controls
Bass :  boost 11 dB/oct, cut 16,5 dB at 50 Hz
Treble :  boost 10 dB , cut 9,5 dB at 10 kHz
Filters
Low :  cut 8 dB at 50 Hz
High :  cut 7,5 dB at 10 kHz
Loudness Contour:  boost 12 dB at 50 Hz, boost 9 dB at 10 kHz (switchable to On-Off ( vol. Control at  -40 dB)
FM Section
Circuitry:  Front end using FET end 4 gang variable capacitor, IF amplifier 4 IC
Semiconductors:  1 FET, 5 ICs, 11 Transistors, 12 Diodes
Frequency Range:  87,5 to 98 MHz
IHF Usable Sensitivity:  1,7 µV
Image Rejection:  87 dB (at 98 MHz)
Signal-to-Noise Ratio :  62 dB (IHF rating)
Antenna Input:  300 ohms (balanced)
Multiplex Section
Circuitry:  Time-switching type de-modulator FM Mono Stereo Automatic selection
Channel Separation:  42 dB (At 1 kHz)
AM Section
Circuitry:  Superheterodyne
Frequency Range:  525 to 1605 kHz
IHF Usable Sensitivity:  18 µV
Image Rejection:  77 dB (at 1000 kHz)
Antenna Input:  Built-in Ferrite Loopstick Antenna
General Section
Line Requirements:  110, 117, 130, 220 and 240 V; 50 - 60 Hz;  210 VA 190 watts (max)
Dimensions (W x H x D):  459 x 145 x 369 mm (18-1/16" x 5-11/16" x 14-1/2")
Weight: 11,4 kg (26 lb 2 oz) net


Acoustic Research AR 302T


The AR 302T is new 3-way Tower Loudspeakers are engineered  to deliver maximum sonic performance at a tremendous value. Utilizing AR's True Acoustic Suspension Technology and Exposed Dome Driver Technology, these floorstanding models reproduce the wide dynamic swings of music and video with the tonal accuracy and flat frequency response you've come to expect from Acoustic Research, AR 302 Towers minimal footprints require less floor space for increased placement flexibility, and their Matched Timbre Design ensures harmonious integration with AR bookshell models for seamless, rtunning home theater sound. Their elegant cherry cabinetry on all four sides presents a striking, contemporary appearance.


Specifications:
System Type:  10" 3-way Acoustic Suspension Tower Speaker
Driver Usage: 
10" long-throw woofer
1-1/2" exposed dome midrange
3/4" exposed dome tweeter
Frequency Response:  32 - 20,000 Hz (±3 dB)
Sensitivity:  85 dB (2,83 V/m)
Impedance:  6 Ω / 4 Ω (nom/min)
Power Rating:  35 W - 250 W (min/max)
Crossover: 
650 Hz (12 dB/oct low-pass; 12 dB/oct high-pass)
5,500 Hz (6 dB/oct low-pass; 18 dB/oct high-pass)
Dimensions (W x H x D):  11 x 36 x 13 inch
Weight:  47 lbs
Finish:  Cherry vinyl