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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





Technics SA-8500X

The concept is simple. The execution is precise. The performance is outstanding - the name is Technics.
The SA-8500X - first 4-channel receiver with automatic CD-4 separation.

Until now you had to depend upon your hands, your eyes and your ears to bring you 4-channel sepaation CD-4 records. When they missed, so did you.
With the Technics SA-8500X. Instead of trial and error, the SA-8500X brings you automatic and continuous  CD-4 separation.
The SA-8500X has just about everything else you might want for command of 4-channel. Automatic carrier level controls. A CD-4 dmodulator with LSI IC's for discrete 4-channel records. A decoder for both types of matrix. And an MPX output ready for discrete FM broadcasts.

There's also plenty of power; 26 watts per channel minimum RMS, at 8 ohms from 20 Hz to 20 kHz, at 8 ohms from 20 - 20 kHz with no more than0,5% THD.
But equally important, all this power is under your control. With 4 VU meters  for visual conrtol of 4-channel balance. 3 tape monitors.  Clik-stop tone controls.  High and low filter switches. And a 20 dB audio muting switch for reducing sound oudput without changing the volume setting.
We've also put a 4-pole dual-gate MOS and 3 ceramic  IF filters into the FM section. So you get a sensitivity of 1,9 µV (IHF).
For stereo, a simple flick of a switch on the front panel straps the amplifiers together.  Producing 80 watts per channel, minimum RMS. At 8 ohms from 20 Hz - 20 kHz with no more  than 0,5% THD.

The SA-8500X - it's the way to hear everything in 4-channel the way it should be heard. Because it's the first 4-channel receiver with both automatic carrier level controls and automatic CD-4 separation.
Specifications
Amplifier section
Music Power (IHF):
4-Ch Operation :  260 W at 4 Ω; 180 W at 8 Ω;
2-Ch Operation :  250 W at 8 Ω
Continuous Power (1 kHz RMS):
4-Ch Operation (all channel driven) : 
40 W/40 W/40 W/40 W at 4 Ω
34 W/34 W/ 34 W/34 W at 8 Ω
2-Ch Balanced Transformerless Operation
Both Channels Driven :  85 W/85 W at 8 Ω
Continuous Power (20-20,000 Hz RMS):
4-Ch Operation:
All Channels Driven : 
28 W + 28 W + 28 W + 28 W at 4 Ω
26 W + 26 W + 26 W + 26 W at 8 Ω
2-Ch Balanced Transformerless Operation
Both Channels Driven :  80 W + 80 W at 8 Ω
Total Harmonic Distortion:  0,5%
Intermodulation Distortion (60 Hz : 7 kHz = 4:1, SMPTE) :  0,7%
Power Bandwidth (all ch. driven at 8 Ω):  5 Hz  - 40 kHz -3 dB
Frequency Response:
Phono : RIAA standard curve ±1 dB
Aux :  7 Hz - 70 kHz +0 -3 dB
Residual Hum and Noise: 1,5 mV
Input Sensitivity/Impedance: 
Phono :  2 mV/50 k Ω
Aux :  180 mV/30 k Ω
Playback :  180 mV/30k Ω
Signal-to-Noise Ratio (IHF-A): 
Phono :  70 dB
Aux :  90 dB
Tone Controls:
Bass :  50 Hz ±11 dB
Treble:  10 kHz +10 dB - 10
 Loudness control (Volume at -30 dB):  50 Hz +10 dB
Filters:
Low :  200 Hz, -6 dB
High :  7 kHz,   -6 dB/oct
Audio Muting:  -20 dB
Rec Out:  180 mV
Damping Factor:  10 at 4 Ω ; 20 at 8 Ω
Load Impedance:
Main or Remote :  4 - 16 Ω
Main + Remote : 8 - 16 Ω
FM Tuner Section
Frequency Range:  88 - 108 MHz
FM Sensitivity (IHF):  1,9 µV
Alternate Channel Selectivity:  66 dB
Harmonic Distortion [mono/stereo]:  0,3%/0,4%
Signal-to-Noise ratio:  65 dB
Frequency Response:  20 Hz - 13 kHz ±1 dB
Image Rejection (at 98 MHz):  55 dB
IF Rejection (at 98 MHz):  60 dB
Spurious Resposne Rejection (at 98 MHz):  60 dB
Capture Ratio:  1,5 dB
Am Suppression :  50 dB
Stereo Separation (at 1 kHz):  40 dB
Leak Carrier (19 kHz, 38 kHz)
Am Tuner Section:  frequency Range :  520 - 1610 kHz
Sensitivity:  20 µV
Selectivity:  25 dB
Image Rejection ( at 1000 kHz) :  40 dB
IF Rejection (at 10000 KHz) :  40 dB
General:
Power Supply:  110 - 120 V, 220-240 V AC, 50/60 Hz
Power Consumption:  360 W
Dimensions (W x H x D):  21-11/32" x 6-3/32" x 15-9/16"
Weight:  37,3 lb

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