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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





Nikko Alpha 130 power-amp


Nikko Power Amplifier 130
Specifications:
Continuous Power Output per Channel:
More than 100 watts  - 20 -20,000 Hz at 8 Ω
More than 100 watts - 20 - 20,000 Hz at 4 Ω
More than 120 watts - 1000 Hz at 8 Ω
More than 130 watts - 1000 Hz at 4 Ω
Total Harmonic Distortion :
Continuous Power Output  at 8 Ω :   no more than 0,01%
Continuous Power Output  at 4 Ω :  no more than 0,03%
1 Watt power Output (8 ohms):  no more than 0,01%
Intermodulation Distortion :
Continuous Power Output  at 8 Ω :  no more than 0,01%
1 Watt Power Output :  no more than 0,03%
IHF Power Bandwidth (8 ohms):  10 - 50,000 Hz
Damping Factor at 1000 Hz (8 ohms):  more than 50
Frequency Response (Normal Input 8 Ω)
At 1 Watt Power Output :  10 - 50,000 Hz  ±0,2 dB
Input Sensitivity for 120 watts Power Output
Main In :  1 V ±2 dB
Signal-to-Noise Ratio (IHF A network):
Main (Normal, Direct) :  better than 110 dB
Signal-to-Noise Ratio (DIN Filter):
Main IN (Normal, Direct) :  better than 90 dB
Channel Balance:  no more than 1 dB
Residual Hum and Noise, 8 Ω:  no more than 0,5 mV
Idling Current:  20 - 60 mA
Midpoint Voltage:  0 ±20 mV
Muting Delay Time:  3 - 7 seconds
Power Requirements:
W-type :  AC 120 V, 60 Hz
E-type :  AC 220 V, 50 Hz
B-type :  AC 240 V, 50 Hz
Power Consumption:  310 W (420 VA)
Dimensions (W x H x D):  482 x 138 x 344 mm (19" x 5-1/3" x 13-1/2")
Weight:  12 kg (26,5 lbs)

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