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





Yamaha R-9


Uncommon sounds. Sounds that make exceptional demands on your audio system. Because from the crescendo of a massed chorale to the detonation of proton torpedos, the sounds of modern entertainment reward audio high-performance as never before. And nothing performs like Yamaha.
Yamaha's sophisticated new R-9 receiver is designed to make the most of today's home entertainment possibilities. With seven audio and three video hookups, the R-9 can serve as the control panel for your entire home audio/video system. And because it has a separates-quality 125 watt per channel amplifier with Auto Class A Power amplification, it provides tha high power and wide dynamic range that add a whole new dimension to your home entertainment experience.

Now you can hear digital recordings and compact disc reproduced with the full clarity and resonance demanded by serious audiophiles. Experience the high-decibel impact of the sound effects that make your favorite films special. And do it through a receiver so advanced it uses discrete circuitry like that found in Yamaha's finest separate components.

The R-9's AM/FM stereo tuner features digital tuning with a unique 5-digit capability that allows you to fine-tune in increments of 0,01 MHz (FM).
This is particularly helpful in obtaining maxinum signal quality when tuning relatively weak stations interfered with by stronger adjacent stations.
Combined with our new Computer Servo Lock Tuning System, it gives you the best of both digital and analog tuning capabilities.
The Yamaha R-9 includes a multi-function infrared remote control. And it is just one in a complete line of advanced Yamaha receivers. Now that's entertainment.


Specifications
Audio Section
Continuous Power Per Channel:
125 W (20 Hz - 20 kHz 0,15% THD; 8 Ω)
145 W (20 Hz - 20 kHz 0,03% THD; 6 Ω)
145 W (1 kHz 0,01% THD; 8 Ω)
Dynamic headroom: 1,58 dB (8 Ω)
Dynamic Power:
180 W at  8 Ω (1 kHz/channel)
220 W at  6 Ω (1 kHz/channel)
280 W at  4 Ω (1 kHz/channel)
360 W at 2 Ω (1 kHz/channel)
Power Bandwidth:  62,5 W, 8 Ω, 0,08% THD, 10 Hz - 50 kHz
Damping Factor:  60 (1 kHz, 8 Ω)
Input Sensitivity/Impedance
Phono MC :  160 µV/220 Ω
Phono MM :  2,5 mV/47 k Ω
CD, Tape, Video :  150 mV/47 k Ω
Receiver (Accessory):  150 mV/47 k Ω
Input Sensitivity (new IHF):
Phono MC :  14 µV
Phono MM :  0,22 mV
CD,Tape,Video :  13,4 mV
Maximum Input Signal (1 kHz)
Phono MC :  8 mV (0,01% THD)
Phono MM :  110 mV (0,1% THD)
Output level/Impedance:
Rec Out :  150 mV/470 Ω
Headphone Jack Rated Output/Impedance:  0,91 V/270 Ω (0,015% THD)
Frequency Response:  20 Hz - 20 kHz +0 -0,3 dB (CD,Tape Video)
RIAA Equalization Deviation
Phono MC RIAA :  ±0,5 dB (30 Hz - 20 kHz)
Phono MM RIAA :  ±0,3 dB (20 Hz - 20 kHz)
Total Harmonic Distortion (20 Hz - 20 kHz):
Phono MC to Rec Out (3 V) :  0,005%
Phono MM to Rec Out (3 V) :  0,003%
cD, Tape to SP Out (62,5 W/8 Ω) :  0,015%
Video to SP Out (62,5 W/8 Ω) :  0,02%
Intermodulation Distortion:
CD,Tape, Video  :  0,01% (Rated Output /8 Ω)
Signal-to-Noise Ratio
Phono MC :  75 dB (500 µV, Input Shorted)
Phono MM :  92 dB (5 mV, Input Sshorted)
CD, Tape :  103 dB (Input Shorted)
Video :  91 dB (Input Shorted)
Signal-to-Noise Ratio (new IHF):
Phono MC :  74,5 dB
Phono MM :  75 dB
CD, Tape :  80 dB
Residual Noise (IHF A-network):  120 µV
Channel Separation
Phono MM :  60 dB (1 kHz, Input Shorted, Vol. -20 dB)
CD, tape Video :  60 dB (1khz, 5,1 k Ω)
Tone Control Charecteristics
Bass  Control
Boost/Cut :  ±10 dB at 50 Hz
Turnover Frequency :  350 Hz
Treble Control
Boost/Cut :  ±10 dB at 20 kHz
Turnover Frequency :  3,5 kHz
MID
 Control Range :  ±12 dB at 1 kHz
Center Frequency :  1 kHz
Flter Characteristics
Low (Subsonic, Builtin):  10 Hz, -12 dB/oct
Continuous Loudness Control (Level-related equalization)
Attenuation :  -40 dB at 1 kHz
Audio Muting :  -20 dB
FM Section
Tuning Range:  87,5 MHz - 108 MHz
50 dB Quieting Sesitivity (IHF)
Mono [75 Ω] :  1,5 µV (14,8 dBf)
Stereo [75 Ω]:  20 µV (37,3 dBf)
Usable Sensitivity (IHF Mono) :  30 dB S/NQuieting, 75 Ω:  0,75 µV (8,8 dBf)
Image Response Ratio:  40 dB
IF Response Ratio:  90 dB
Spurious Response Ratio:  70 dB
AM Suppression Ratio:  55 dB
Capture Ratio
Local :  1,2 dB
DX :  2,5 dB
Alternate Channel Selectivity
DX :  85 dB
Signal-to-Noise Ratio
Mono :  85 dB
Stereo :  81 dB
Total Harmonic Distortion [MONO]
100 Hz :  0,05%
1 kHz :  0,05%
6 kHz :  0,1%
Total Harmonic Distortion {STEREO}
100 Hz :  0,07%
1 kHz :  0,07%
6 kHz :  0,15%
Stereo Separation (Local)
50 Hz :  45 dB
1 kHz :  50 dB
10 kHz :  45 dB
Frequency Response;  30 Hz - 13 kHz  ±0,5 dB
Output Level/Impedance (Rec Out):  500 mV/2,8 k Ω (FM 100% mod. 1 kHz)
AM Section
Tuning Range:  510 kHz - 1620 kHz
Usable Sensitivity:  250 µV/m
Selectivity:  24 dB
Signal-to-Noise Ratio:  50 dB
Image Response Ratio:  40 dB
Spurious Response ratio:  50 dB
Total Harmonic Distortion (400 Hz):  0,3%
Output Level/Impedance (Rec Out):  150 mv/2,8 k Ω (AM 30% Mod, 400 Hz) 
General
Power Supply:  110, 120, 220, 240 V AC, 50/60 Hz
Power Consumption:  400W
AC Outlet [{U}{C}{R} only]
Switched x 2 :  100 W {R}, 60 W {U}{C}
Unswitched x 1 :  200 W max.
Dimensions (W x H x D):  435 x 151 x 423 mm (17-1/8" x 5-15/16" x 15-5/8")
Weight:  12 kg (26 lb 7 oz)


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