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 AA930

The Stereo Tuner Amplifier AA-930 , like all of the AA-900 Series, features uncluttered front panel control design for efficient operation. Powerful 200 W solid state tuner amplifier employing top quality parts and space-age circuitry for quality stereo performance.

Sophisticate your old system with Akai's new AA-930 stereo receiver.  Delivers all the power and performance your system could ever need. Separate signal and tuning indicators are provided, plus sound monitoring, high/low filters and FM muting. The AA-930 comes in a distinctive rosewood cabinet, … a unit that looks as good as it sounds.
Specifcations
FM Tuning Range:  86 to 108 MHz
Dial Tracking Error:  ±250 khz
Sensitivity (IHF):  2,8 µV
Sensitivity Deviation:  withinh 3 dB
Image Rejection Ratio:  better than 85 dB
IF Rejection Ratio:  better than 100 dB
Capture Ratio (IHF):  less than 1,5 dB
Liliting Sensitivity:  less than 8 dB
Muting Sensitivity:  20 dB ±3
Selectivity:  better than 80 dB
AM Suppression Ratio:  better than 45 dB
Signal-to-Noise Ratio:  70 dB
Distortion Factor [stereo/mono]:  less than 1,5% / 0,5%
Frequency Response:  -11 dB at 10 kHz (±1 dB)
Stereo Sensitivity:  less than 20 µV (less than 26 dB)
Stereo Separation:  better than 35 dB
Rejection Ratio:  better than 50 dB
L-R Deviation:  within 3 dB
Recording Output:
Pin :  390 mV (-6±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 60 dB at 1 MHz
IF Rejection Ratio:  better than 60 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:  
50 W per channel at 4 Ω
45 W per channel into 8
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 :  2,2 mV (-51 ±1,5 dB)
Mic :  1,5 mV (-54 ±1,5 dB)
Aux :  110 mV (-17 ±1,5 dB)
Tape :  110 mV (-17 ±1,5 dB)
Signal-to Noise Ratio:
Phono :  better than -33 dB
Mic :  better than -33 dB
Aux :  better than -43 dB
Tape :  better than -43 dB
Residual Noise:  less than 2,5 mV (less than -50 dBm)
Tone Control
Bass :  ±10 at 100 Hz ±10 dB
Treble :  ±10 at 10 kHz ±10 dB
Loudness Control:  7 at 100 Hz ±1,5 dB; 6 at 10 kHz ±1,5 dB
Filter
Low Cut Filter :  -9 at 50 Hz ±1,5 dB
High Cut Filter :  -9 at 10 kHz ±1,5 dB
Audio Mute:  -20 at 1 kHz ±1,5 dB
Crosstalk:  better than 50 dB
L-R Deviation:  within 2 dB Phono
Recording Output
Pin :  125 mV (-16 ±2 dB)
DIN :  23 mV (-30 ±2 dB)
General
Semiconductors:  53 Transistors; 1 FET; 5 ICs; 30 Diodes; 5 Zener Diodes; 2 Varistors
Power Source:  100 to 240 V , 50/60 Hz
Power Consumption:  Max 260 W/320 VA (4 Ω)
Dimensions (W x H x D):  483 x 168 x 398 mm (19" x 6,6" x 15,7")
Weight:  15 kg  (33 lbs)

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