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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





Aiwa SA-P50 power amp

DC Stereo Power Amplifier

A high-efficiency power amplifier capable of unmistakably "full-sized" performance, the SA-P50 puts out a muscular 50 Watts per channel into 8 ohms, form 20 to 20,000 Hz, both channels driven, with no more than 0,03% Total Harmonic Distortion .

Coupling capacitors, a cause of phase distortion in the amplifier's negative feedback loop, have been eliminated. An FET in the first output stage and dual transistors in the second stage combine to form a 2-stage differential configuration having low distortion and superb temperature stability characteristics. Super linear transistors (SLPT) with an ultra high-speed frequency cut-off and ring emitter transistors in the final stage make up a pure complementary SEPP OCL circuit with exciting, low distortion reproduction at any output level. For stable power regulation essential for reproduction of dynamic musical passages, power supply is composed of a high-efficiency toroidal power transformer and two large capacity 15,00 µF electrolytic capacitors. A newly developed IC and relay function to suppress "pop" noises during On/Off switching; the self-resetting protection circuit also protects the power transistors from shorts in the output and speakers are isolated if potentially damaging DC is detected at speaker output terminals.


 

Features:

LED Power On indicator

9-point logarithmic peak power LED indicator (0,1 - 100 Watts)

A/B speaker system selector

Stereo headphone jack

One-touch speaker connection terminals

 


Specifications

Power Output:  50 watts per channel, Min. RMS at 8 Ω , from 20 Hz - 20 kHz, with no more than 0,03% T.H.D.

Total Harmonic Distortion :  0,01% ( 50 W, 8 Ω , 1 kHz)

Intermodulation Distortion:  0,01% (50 W, * Ω , 1 kHz)

Power Bandwidth:  10 Hz - 50 kHz (T.H.D. 0,05%)

Damping Factor:  40 at 1 kHz

Frequency Response:  10 Hz - 100 kHz (-3 dB)

Signal-to-Noise Ratio:  112 dB

Input Sensitivity/Impedance:  800 mV/ 47 k Ω

Output Terminals:

Speaker :  A/B (8 - 16 Ω ); A + B (16 Ω )

Headphone :  1 mW/1W, 8 Ω

Dimensions (W x H x D):  250 x 71 x 247,5 mm (9-7/8" x 2-13/16" x 9-3/4")

Weight:  5,4 kg (11,9 lbs)


 

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