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





Hitachi HA-2500 amplifier

Features:
Low-distortion power amplifier
Connection facilities for two pairs of speakers
New ICs in the Equalizer
Subsonic filter that cuts out rumble and wow in the ultra-low frequencies without impairing the sound quality
LED program source indicators

Specifications
Power Output (Both channels driven):
20 W/ch + 20 W/ch ( into 8 Ω , 40 - 20,000 Hz ,T.H.D. 0,07%)
23 W/ch + 23 W/ch (into 8 Ω , 1 kHz, T.H.D. 0,07%)
25 W/ch + 25 W/ch (into 4 Ω , 1 kHz, T.H.D. 0,07%)
Power Bandwidth:  20 Hz - 20 kHz
Frequency Characteristics:
Tuner, Tape :  20 Hz - 40,000 Hz  (+1, -1,5 dB)
Phono :  RIAA ±0,7 dB
Total Harmonic Distortion ( at 8 Ω )
At rated output :  less than 0,07%
At 1/2 rated output :  less than 0,05%
Intermodulation Distortion
At 1/2 Rated Output:  less than 0,05%
Input Sensitivty/impedance:
Phono :  2,5 mv /47 k Ω
Tuner :  150 mV/40 k Ω
Tape :  150 mV/40 k Ω
Output Level
Tape Output:  150 mV (phono, Tuner)
Phono Overload Level :  140 mV ( at 1 kHz, T.H.D.0,05%)
Signal-to-Noise Ratio (IHF a Network):
Phono :  70 dB
Tuner, Tape :  90 dB
Damping Factor:  30 (1 kHz, 8 Ω )
Bass Control:  ±8 dB at 100 Hz
Treble Control :  ±8 dB at 10 kHz
Loudness Contour:  =9 dB (at 100 Hz)
Subsonic Filter:  20 Hz (-6 dB/oct)
Semiconductors:  2 ICs,  25 Transitors, 13 Diodes, 2 LEDs
Power Supply:  120 V, 220 V, 240 V, 50/60 Hz
Power Consumption:  170 W (at rated output)
Dimeensions (W x H x D):  435 x 110 x 275 mm
Weight:  5,4 kg

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