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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





Akai AA920

 AA-920 Stereo Tuner Amplifier
The AA_920 top quality FM/AM MPX stereo tuner amplifier features multiple connections and controls and three separate speaker systems which can be utilized individually or two systems simultaneously. Step type volume control with prest facility, bass and treble controls for even and precise adjustment. Efficient design includes signal strength tuning meter, mode indicator lamps and ideally positioned controls for easy operation.

Specifcations
FM Tuning Range:  86,8 to 109,2 MHz
Dial Tracking Error:  ±250 khz
Sensitivity (IHF):  3,2 µV
Sensitivity Deviation:  withinh 3 dB
Image Rejection Ratio:  better than 75 dB
IF Rejection Ratio:  better than 85 dB
Capture Ratio (IHF):  less than 2,5 dB
Liliting Sensitivity:  less than 8 dB
Muting Sensitivity:  23 dB ±3
Selectivity:  better than 70 dB
AM Suppression Ratio:  better than 45 dB
Signal-to-Noise Ratio:  70 dB
Distortion Factor [stereo/mono]:  less than 1,5% / 0,7%
Frequency Response:  -11 dB at 10 kHz (±1 dB)
Stereo Sensitivity:  less than 14 µV
Stereo Separation:  better than 33 dB
Rejection Ratio:  better than 50 dB
L-R Deviation:  within 3 dB
Recording Output:
Pin :  350 mV (-7±3 dB)
DIN :  70 mV (-21 ±3 dB)
AM Tuner Section
Frequency Range:  525 to 1650 kHz
Dial Tracking Error:  within 2%
Sensitivity (IHF):  250 µV
Sensitivity Deviation:  within 6 dB
Image Rejection Ratio:  better than 55 dB at 1 MHz
IF Rejection Ratio:  better than 55 dB at 1 MHz
Selectivity:  better than 30 dB ±10 kHz
S/N Ratio:  better than 40 dB
Distortion Factor:  less than 1,5%
Frequency Response:  -15 dB at 3 kHz
Recording Output:
Pin :  140 mV (-15 ±2 dB)
DIN :  27 mV (-29 ±2 dB)
Audio Section
Power Output:  
45 W per channel at 4 Ω
30 W per channel into 8 Ω
Frequency Response:
Phono :  RIAA standard  ±1,5 dB
Aux :  20 Hz to 50,000 Hz
Power Bandwidth:  10 to 50,000 Hz (distortion 0,5%)
Input Sensitivity
Phono :  2,5 mV (-50 ±1,5 dB)
Mic :  2,5 mV (-50 ±1,5 dB)
Aux :  140 mV (-15 ±1,5 dB)
Tape :  140 mV (-15 ±1,5 dB)
Signal-to Noise Ratio:
Phono :  better than -35 dB
Mic :  better than -35 dB
Aux :  better than -45 dB
Tape :  better than -45 dB
Residual Noise:  less than 1,4 mV (less than -55 dBm)
Tone Control
Bass :  ±10 at 100 Hz ±10 dB
Treble :  ±10 at 10 kHz ±10 dB
Loudness Control:  9 dB  at 100 Hz ±1,5 dB; 6 dB  at 10 kHz ±1,5 dB
Filter
Low Cut Filter :  -8 dB  at 50 Hz ±1,5 dB
High Cut Filter :  -9 dB at 10 kHz ±1,5 dB
Crosstalk:  better than 50 dB
L-R Deviation:  within 2,5 dB Phono
Recording Output
Pin :  140 mV (-15 ±2 dB)
DIN :  25 mV (-30 ±2 dB)
General
Semiconductors:  38 Transistors; 3 FET; 5 ICs; 20 Diodes; 1 Zener Diodes; 2 Varistors
Power Source:  100 to 240 V , 50/60 Hz
Power Consumption:  Max 180 W
Dimensions (W x H x D):  454 x 155 x 330 mm (17,9" x 6,1" x 13")
Weight:  15 kg  (33 lbs)
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