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 2450 (1977)



POWER AMPLIFIER SECTION
RATED OUTPUT POWER (2 CHANNELS DRIVEN):
45 watts per channel,minimum RMS,a t 8 ohms from 20 to 20,000 Hz with no more than 0,1% (THD)
POWER BANDWIDTH: 6 Hz to 60 kHz/8 ohms (Total Harmonic Distortion: 0.1%)
SIGNAL TO NOISE RATIO (IHF) ;
PHONO: Better than 75 dB
AUX: Better than 95 dB
RESIDUAL NOISE: Less than 0.5 mV at 8 ohms
CHANNEL SEPARATION (lHF) PHONO: Better than 55 dB at 1,000 Hz
DAMPING FACTOR: More than 30 (1 kHz, 8 ohms)
OUTPUT SPEAKERS: A, B (4 to 16 ohms)/A + B (8 to 16 ohms)
OUTPUT HEADPHONE: 4 to 1.6 ohms

PREAMPLIFIER SECTION
INPUT SENSITIVITY/IMPEDANCE;
PHONO: 3 mV/47 kohms
AUX: 150 mV/l00 kohms
TUNER: 150 mV/100 kohms
TAPE MONITOR: PIN: 150 mV/100 khoms, DIN: 150 mV/l00 kohms
OUTPUT LEVEL/IMPEDANCE (TAPE REC): PIN: 150 mV/l kohms, DIN: 30 mVi 80 kohms
FREQUENCY RESPONSE
PHONO (RIAA EQUALIZATION): 30 Hz to 15 kHz +1 dB, -1 dB
TUNER, AUX, TAPE MONITOR: 10 Hz to 60 kHz +1 dB, -1 dB
TONE CONTROL;
BASS: ±9 dB at 100 Hz
TREBLE: ±9 dB at 10 kHz
LOUDNESSC ONTROL: +10 dB at 100 Hz, +5 dB at l0 kHz (Volume control set at -30 dB position)

MISCELLANEOUS
SEMICONDUCTORS: Transistors - 27. Diodes - 17, IC's - 4
POWER REQUIREMENTS: 110/220/240V , 50/60 Hz
DIMENSIONS: 440 (W) x 144 (H) x 345 (D) mm, (17,3 x 5,7 x 13,6 inches)
WEIGHT: 9.9 kg, (21.8 lbs)

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