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





Rotel RA-920AX amplifier


Integrated Stereo Amplifier

Specifications
Continuous Power Output:  20 watts per channel, min. RMS both channels driven into 8 Ω  from 20 -20,000 Hz with no more than 0,03% Total Harmonic Distortion
DIN Output:  35 watts per channel (1 kHz, 4 Ω , 1% T.H.D.)
Music Power :  75 watts
Total Harmonic Distortion(20 to 20,000 Hz from AUX):
Continuous Rated Power Output :  no more than 0,03%
Continuous 1/2 Rated Power Output :  no more than 0,03%
1 Watt per Channel Power Output, 8 Ω  :  no more than 0,03%
Intermodulation Distortion (60 Hz :7 kHz = 4:1)
Continuous Rated Power Output :  no more than 0,03%
Continuous 1/2 Rated Power Output :  no more than 0,03%
1 Watt per Channel Power Output, 8 Ω  :  no more than 0,03%
Output Impedance
Speaker :  4 Ω  minimum
Headphone :  8 - 2,000 Ω 
Damping Factor:  180 ( 20 - 20,000 Hz 8 Ω  )
Input Sensitivity/Impedance:
Phono :  2,5 mV/47 kohm
CD, Tuner, Tape Aux :  150 mV/20  k Ω
Overload Level (T.H.D. 0,5%, 1 kHz)
Phono :  180 mV
CD, Tuner, Tape, Aux :  5 V
Frequency Response:
Phono :  20 to 15,000 Hz ±0,3 dB (RIAA standard)
Cd, Tuner, Tape, Aux :  10 to 40,000 ±1,0 dB
Tone Control
Bass :  ±6 dB at 100 Hz
Treble :  ±6 dB at 10 kHz
Signal-to-Noise Ratio (IHF, A network)
Phono :  78 dB
CD, Tuner, Tape, Aux :  98 dB
Power
Requirement:  120, 220, 240 V 50/60 Hz
Consumption:  120 watts
Dimensions (W x H x D):  440 x 92 x 304 mm (17-3/8" x 3-5/8" x 12")
Weight:  5,1 kg (11,2 lbs)

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