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





Tannoy SRM 12X - monitor


One of the Super Red Monitor from Tannoy, the real Thing,, SRM 12X
The SRM 12X Monitor from Tannoy is definitely no impostor, but a fully fledged Studio Monitor whose size makes it equally suitable for domestic use. The Tannoy Dual Concentric  "2 Speaker in One" integrated drive system - similar to our formidable Super Red Monitor - handles 100W of continuous power, and will take peaks of 300W.
The legendary Tannoy efficiency means that power is used to fill your room with more music than conventional speakers, and all at a price that won't bankrupt you.
The SRM 12X, and any other model in the new Tannoy SRM Series of Monitors, will transform your listening pleasure. Why settle for inferior speakers, when the advantage of the World's Finest Monitoring Systems is now available to you at home.

Some speakers carry the title of "Monitor" without actually posessing the professional standards of performance implied by the term. At Tannoy we know a thing or two about monitoring - we/ve supplied Monitor Loudspeakers to the World's leading recording and broadcast studios for 30 years. In the tough profrssional sound world you only last that long if your product is the best, so you canbe sure that any Tannoy Monitor is certainly the Real Thing

Specifications
Rec. Amp. Power:  10 -200 W
Peak Power Handling:  350 W
Max SPL (in room conditions  equidistant from each speaker):  120 dB (126 dB/pair)
Sensitivity (1 W at 1 m anechoic):  92 dB
Drive Units :  305 mm (12") Dual Concentric
Dimensions (H x W x D):  846 x 446 x 272 mm (33: x 17,5 " x 11")
Weight:  30 kg (66 lbs)


Hitachi FT-440 tuner

 Hitachi model FT-440 AM/FM Stereo Tuner
Specifications:
Circuitry:  AM/FM 2-band stereo tuner
Semiconductors:  12 Transisors; 1 FED; 2 ICs; 23 Diodes; 2 LED
FM Section
Frequency Range:  88 - 108 MHz
Usable Sensitivity:  1,7 µV (IHF)
Image Rejection:  75 dB
IF Rejection:  100 dB
Distortion:
Monaural :  0,1% (400 Hz)
Stereo :  0,25% (400 Hz)
Signal-to-Noise ratio:  76 dB
Selectivity:  80 dB (±400 Hz)
Stereo Separation:  50 dB (1 kHz)
Capture Ratio:  1,0 dB
Antenna Input Impedance:  300 Ω balanced type; 75 Ω unbalanced type
AM Section
Frequency Range:  530 - 1,605 kHz
Usable Sensitivity:  12 µV (IHF), 250 µV/m (bar antenne)
Image Rejection:  45 dB (1000 kHz)
IF Rejection:  388 dB
Selectivity:  34 dB (±10 kHz)
Signal-to-Noise Ratio:  45 dB
Output Voltage:
AM :  0 -165 mV (variable) [400 Hz, 30% modulation]
FM :  0 - 550 mV (variable [400 Hz, 100% modulation]
Power Requirements:  AC 120 V 60 Hz or 110 V, 120 V, 220 V, 240 V 50/60 Hz
Power Consumption:  12 W
Dimensions (W x H x D):  435 x 166 x 377 mm
Weight:  7 kg (15,4 lbs)


Sanyo FMT-611K tuner

 Sanyo Stereo Tuner FM/AM Band, model FMT-611K
Specifications:
Usable Sensitivity:
Mono :  1,9 µV/10,77 dBf
Stereo :  4,8 µV/18,82 dBf
50 dB Quieting Sensitivity
Mono :  2,8 µV/14,14 dBf
Stereo :  38 µF/36,79 dBf
Signal-to-Noise Ratio at 1 mV
Mono :  70 dB
Stereo :  66 dB
Capture Ratio:  1,2 dB
Alternate Channel Selectivity :  65 dB (±400 kHz)
Image Response Ratio:  58 dB
Spurious Response Ratio:  85 dB
IF Response Ratio:  75 dB
AM Suppression Ratio:  60 dB
Total Harmonic Distortion:
Mono :  0,15%
Stereo :  0,2%
Stereo Separation (100 Hz/ 1 kHz/ 10 kHz):  35 dB/ 40 dB/ 35 dB
Sub-Carrier Product Rejection (19 kHz/38 kHz):  70 dB/ 70 dB
Audio Frequency Response:  20 Hz -15 kHz ±2 dB
AM Section
Usable Sensitivity:  300 µV/m
Sellectivity at ±10 kHz:  40 dB
Spurious Rejection:  45 dB
Image Response Ratio:  50 dB
IF Response Ratio:  40 dB
Signal-to-Noise at 100mV/Input:  65 dB
Total Harmonic Distortion at 10 mV/m Atenna Input:
30% mod. :  0,3%
80% mod. :  0,9%
General Section
Power Requirements:  120 V AC
Power Consumption:  18 W
Dimensions (W x H x D):  16-1/2 x13-3/4 x 5-7/8 inch
Weight:  14,3 lbs


Sansui AU-20000 amplifier


High-output , low-distortion circuitry
The AU-20000 is the most powerful integrated amplifier in Sansui's distinguished AU Series. Its constant and reliable power output is a continuous 170 watts, min.RMS, per channel, both channels driven into 8 ohms, over a 20 Hz to 20 kHz bandwidth with no more than 0,05% Total Harmonic Distortion.
Powerful Triple Push-Pull output circuit design
No less than six hand-selected power transistors are used in each output channel. The triple push-pull circuitry here is guaranteed to deliver its rated output at the lowest possible distortion power to spare, always.

Dependable power Supply
Particularly close attention is paid to the power supply design to ensure dependability and stability. The circuit is the plus-minus symmetrical voltage type, coupling a low magnetic leakage toroidal transformer with extra large capacitors.
Dual-Amplifier Phono equalizer with low-noise transistors
Dynamic response is improved by the 8-transitor equalizer with differential amplifiers at its initial stages. Distortion is totally minimized, and the dual amplifier design - a CR type for highs and a NF type for lows achieves very accurate RIAA equilization.

Triple Tone Control
The AU-20000  features Sansui's exxlusive Triple Tone Control design, controlled by a CR type circuit. A wide dynamic range and excellent transient response are assured by the use of a plus minus voltage supply
Complete Triple Protection Circuits
Damage and breakdowns are avoided entirely with the use of a temperature sensing circuit, a DC voltage detection circuit and an ASO (Area of Safety Operation) detection circuit. Shorts in speaker terminals or leads, or power temperature emergencies instantly activate these circuits for complete protection.
Selectable phono sensitivity and Impedance
The phono input circuitry in the AU-20000 incorporates two special selectors, each with three positions, to allow the selection of the correct sensitivity and impedance to obtain optimum results with any cartridge in use.

Versatile tape monitor circuit
The AU-20000 accepts up to the stereo tape deck and provides individual monitoring and deck-to-deck dubbing for each. It also permits source monitoring during the dubbing process.
Other user-oriented features
Provided are:  Tone Defeat Switch; 3-Step Audio Muting Switch; 2-Step Low/High Filters; Mode Switch; Meter Sensitivity Switch, and large, Self-Illuminated level Meters.

Specifications
Power Output: 
170 watts per channel into 4 and 8 Ω
85 watts per channel into 16 ohms
Load Impedance:  4, 8 and 16 Ω
Power bandwidth:  20 to 20,000 Hz at or below rated min. RMS power output and Total Harmonic Distortion
Total Harmonic Distortion: :  less than 0,05% at or below rated min.RMS power output and Total Harmonic Distortion
Intermodulation Distortion (70 Hz : 7 kHz = 4 : 1 SMPTE Method):
Overal (from AUX) less than 0,05% at rated RMS power output
RIAA Curve Deviation (Phono):  +0,2 dB, -2 dB (30 to 15,000 Hz)
Channel Separation (at rated output  1,000 Hz):
Phono 1 :  better than 55 dB
Phono 2 :  better than 55 dB
Tuner :  better than 60 dB
Aux :  better than 60 dB
Power Amplifier :  better than 100 dB
Tape Monitor :  better than 60 dB
Hum and Noise (IHF):
Phono 1 :  better than 70 dB
Phono 2 :  better than 70 dB
Tuner :  better than 80 dB
Aux :  better than 80 dB
Power Amplifier :  better than 100 dB
Tape Monitor :  better than 80 dB
Input Sensitivity and Impedance (1 kHz, for rated output):
Phono 1 ;  1,5 mV, 3 mV, 6 mV / 30 k, 50 k, 100 k Ω
Phono 2 :  1,5 mV, 3 mV, 6 mV / 50 k Ω
Max. Input Capability:  more than 350 mV RMS at 0,05% distortion
Tuner :  130 mV / 50 k Ω
Aux :  130 mV/ 50 k Ω
Tape Playback 1 :  130 mV (PIN)
Tape Playback 2 : 130 mV (PIN); 130  mV (DIN)
Tape Playback 3 :  130 mV (PIN)
Recording Output
Tape 1 :  130 mV (PIN)
Tape 2 :  130 mV (PIN), 30 mV (DIN)
Tape 3 :  130 mV (PIN)
Controls:
Bass :  +10 dB  -10 dB at 30 Hz
Midrange :  +5 dB -5 dB at 1,500 Hz
Treble :  +10 dB  -10 dB at 20,000 Hz
Filters:
Low :  -3 dB at 20 Hz (12 dB/oct);  -3 dB at 40 Hz (12 dB/oct)
High :  -3 dB at 7 kHz (6 dB/oct);  -3 at 12 kHz (12 dB/oct)
Muting:  0 dB, -10 dB, -30 dB
Power Requirements:  100, 120, 220, 240 V 50/60 Hz
Dimensions (W x H x D):  460 x 178 x 400 mm (18-1/8" x 7" x 15-3/4")
Weight:  22,6 kg (49,8 lbs) net