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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





Denon POA-1001

 Solid State Stereo Power Amplifier POA-1001 (1978)
Usually for large output power amplifiers, a large number of power transistors are used in parallel, making it difficult to bring out its characyeristics. POA-1001, for the first time, was able to realize 100 W + 100 W by a single push-pull, proving that good sound reproduction is an absolute condition.
To the last stage transistor, which constitutes a decisive factor in the performance of a power amplifier, a newly developed bipolar power transistor with a collector loss of 150 W used after making every possible improvement in the switching characteristics. Balance drive system by 2-stage differential amplifier current mirror circuit.
Independent left and right power transformers, rectified circuitry, completely monaural constitution.
Oversized capacitor 88,000 µF and oversized heat sink.

Specifications:
Type:  Silicon transistor, DC power Amplifier
Rated Output (both channel driven):
125 W (RMS at each channel) at 4 Ω 20 Hz - 20 kHz
100 W (RMS at each channel) at 8 Ω 20 Hz - 20 kHz
Total Harmonic Distortion (at rated ouput):  0,05% (20 Hz - 20 kHz)
Intermodulation Distortion (60 Hz/7 kHz:4/1):  0,05%
Power Bandwidth:  3 Hz - 70 kHz
Frequency Response:  3 Hz - 100 kHz
Input Sensitivity/Impedance:  1 V (RMS)/ 50 k Ω
Output Impedance:  0,08 Ω
Damping Factor:  100 (at 8 Ω)
Signal-to-Noise Ratio:  110 dB
Low Filter:  10 Hz (18 dB/oct)
Power
Supply :  AC 120 V 60 Hz; AC 220/240 V 50/60 Hz
Consumption :  250 W
Dimensions (W x H x D):  410 x 200 x 280 mm
Weight:  22 kg
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