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





Akai AM-2250



Specifications
Power Amplifier Section
Rated Output Power  (2-channels driven): 
28 watts per channel at 4 Ω (minimum RMS)  from 20 to 20,000 Hz with no more than 0,3% (THD)
25 watts per channel at 8 Ω (minimum RMS)  from 20 to 20,000 Hz with no more than 0,2% (THD)
2 x 30 watts into 4 Ω at 1 kHz, with no more than 0,3% THD
2 x 30 watts into 8 Ω at 1 kHz, with no more than 0,2% THD
Power Bandwidth (IHF):  10 Hz to 40 kHz/8 Ω  (Total Harmonic Distortion: 0.2%)
Signal-to-Noise Ratio (IHF) ;
Phono:  Better than 75 dB
Aux:  Better than 95 dB
Residual Noise:  Less than 0.7 mV at 8 Ω
Channel Ssparation (lHF) Phono:  Better than 45 dB at 1,000 Hz
Damping Factor:  More than 50 (1 kHz, 8 Ω)
Output Speakers:  A, B (4 to 16 Ω)/A + B (8 to 16 ohms)
Output Headphone:  4 to 16 Ω

Preamplifier Section
Input Sensitivity/Impedance;
Phono:  3 mV/47 k Ω
Aux:  150 mV/l00 k Ω
Tuner:  150 mV/100 k Ω 
Tape  Monitor (PIN/DIN): 150 mV at 100 k Ω /  30 mV at 80 k Ω
Tape Rec Output Level/Impedance (PIN/DIN):  150 mV at 100 k Ω / 30 mV at 80 k Ω
Frequency Response
Phono (RIAA Standard):  30 Hz to 15 kHz  +1 dB, -1 dB
Tuner, Aux, Tape Monitor:  10 Hz to  40 kHz  +0 dB, -1 dB
Tone Control;
Bass:  ±8 dB at 100 Hz
Treble:  ±6 dB at 10 kHz
Loudness Control:  +9 dB at 100 Hz, +4 dB at 10 kHz (Volume control set at -30 dB position)

Miscellaneous
Semiconductors:  Transistors - 3,  Diodes - 4,  IC's - 2 
Power Requirements:  110/220/240V , 50/60 Hz
Dimensions (W x H x D):  380 x 130 x 220 mm,  (15 x  5,1 x 8,7 inches)

Weight:  6.2 kg,  (13.6 lbs)

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