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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





Onkyo TX-850


Important Features:
Discrete Output Stage:
Instead of IC power amp circuitry, the TX-850 both employ a discrete output stage for effortless drive into low impedance loads. Low distortion linear switching and the high quality parts used throughout are proof of Onkyo's dedication to audio excellence not merely in its high end amps but across the board.
"CD Direct" Switch:
This switch lets the user bypass the tone and balance controls in the amplifier when listening to CD (or other digital audio sources).since noise levels in digital audio are extremely low, sending and switching the audio signal through tone and balance circuitry is often unnecessary and may even adversely alter the high quality digital signal.
APR (Automatic Precision Reception) System:
Onkyo's exclusive APR precision reception system lets every FM broadcast sound its best. Intelligent circuitry monitors the signal and selects the optimum settings for three reception modes: stereo/mono, hi-blend on/off and local/DX mode, the system controls the noise reduction on/off mode as well.  The APR system settings are shown by indicators on the front panel.
Other Features:
20-station FM/AM Random memory with Battery Free Backup
Full Logic Selector Keys for Seven Input Sources Including Video Input and Dubbing Capabilities
Dynamic Bass Expander and Stereo Image Expander
Selective Tone Control
Sleep Timer (max. 90 minutes, also operable via remote control)
Simulated Stereo
Remote Controlled Motor Driven Volume Control
System Remote Control Possible with Onkyo Components

Specifications:
Amplifier Section
Power Output:  68 watts per channel, min. RMS, at 8 Ω both channels driven, from 20 Hz to 20 kHz with no more than 0,04% T.H.D.
Total Harmonic Distortion:  0,04% at rated power
IM Distortion:  0,04% at rated power
Damping Factor:  40 at 8 Ω
Frequency Response:  20 - 30,000 Hz ±1 dB
RIAA Deviation:  20 - 20,000 Hz ±0,8 dB
Sensitivity and Impedance:
Phono :  2,5 mV/ 50 k Ω
CD/Tape Play :  150 mV/50 k Ω
Tape Rec :  150 mV/ 3,5 k Ω
Phono Overload:   120 mV RMS at 1 kHz, 0,04% T.H.D.
Signal-to-Noise Ratio:
Phono :  85 dB (at 10 mV input, A weighted);  75 dB (IHF-A 202)
CD/tape :  85 dB (A weighted);  80 dB (IHF-A  202)
Tone Controls:
Bass :  ±10 dB at 100 Hz
Treble :  +_10 dB at 10 kHz
FM Tuner Section:
Tuning Range:  87,9 - 107,0 MHz (200 kHz steps) and/or 87,5 - 108,0 MHz (50 kHz steps)
Usable Sensitivity
Mono :  10,8 dBf (1,9 µV)
Stereo :  17,2 dBf (4,0 µV)
50 dB Quieting Sensitivity
Mono :  17,2 dBf (4,0 µV)
Stereo :  37,2 dBf (40 µV)
Capture Ratio:  1,5 dB
Image rejection ratio:  40 dB
IF Rejection ratio:  90 dB
Signal-to-Noise Ratio: 
Mono :  73 dB
Stereo :  67 dB
Alternate Channel Attenuation:  55 dB
AM Suppression Ratio:  50 dB
Harmoni Distortion:
Mono :  0,15%
Stereo :  0,25%
Frequency Response:  30 - 15,000 Hz ±1,5 dB
Stereo  Separation:  45 dB at 1 kHz; 30 dB at 100 - 10,000 Hz
Muting Level"  17,2 dBf (4 µV)
AM Tuner Section
Tuning Range:  530 - 1620 kHz (10 kHz steps) and/or 522 - 1611 kHz (9 kHz steps)
Usable Sensitivity:  30 µV
Image rejection ratio:  40 dB
IF Rejection ratio:  40 dB
Signal-to-Noise Ratio: 40 dB
Harmonic Distortion:  0,7%
General Section
Power Supply:  AC 120V, 60 Hz and/or 120V and 220 V switchable, 50/60 Hz
Dimensions (W x H x D):  435 x 130 x 351 mm (17-1/8" x 5-1/8" x 13-13/16")
Weight:  8,8 kg 919,4 lbs)

Remote Control (RC-118S)
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