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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





Rotel RA-311

 Here is the best example of Rotel's cost-performance outperformer. RA-311 is a new and very versatile stereo pre-main amplifier that let you handle all kinds of program sources. Besides record player, note two tape recorders you can operate and with dubbing, too. And yet another input for an additional component, not counting one for tuner. All can be simply and smoothly controlled by this amplifier's amplr 20W + 20W RMS continuous power both channels driven at wide frequency response and negligible distortion, along with other efficient controls and switches.
 Special Features:
Geared to let you enjoy genuine high fidelity sound
All advanced solid state electronics design
All low-noise silicon output transistors
Handsomely trimmed aluminum extrusion panel
Control layout designed with optimum human engineering
Rotary - Speakers, Bass, Treble, Balance Volume and Function selector
Pushbuttons - High Filter, Loudness, Mode, Tape Monitor 1 and Tape Monitor 2
Convenient headphone jack and power beacon
Facilities for magnetic and ceramic phones, tuner, two tape recorders and auxiliary component
Tape dubbing from tape 1 to tape 2
Speaker 4-channel matrix for simulated 4-channel surround effect
Wood cabinet included
Specifications:
Total Music Power (IHF):  100 W at 4 Ω
Continuous Power (RMS):
30 W + 30 W each channel driven at 4 ohms
24 W + 24 W each channel driven at 8 ohms
25 W + 25 W both channel driven at 4 ohms
20 W + 20 W both channel driven at 8 ohms
(all less than 1% total harmonic distortion at 1 kHz)
Harmonic Distortion:  0,1% at 18W + 18W RMS, 8 Ω
IM Distortion:  0,3% at 18W + 18W RMS, 8 Ω
Frequemcy Response:  15 to 70,000 Hz, -3 dB at 8 Ω
Power Bandwidth (IHF):  20 to 50,000 Hz at 8 Ω
Input Sensitivity/Impedance:
Phono Mag :  2,5 mV/ 40 k Ω
Phono Ceramic :  140 mV/ 94 k Ω
Tuner, Aux :  170 mV/ 46 k Ω
Tape Monitor In 1, 2 :  150 mV/ 46 k Ω
Tape DIN :  330 mV/ 100 k Ω
Signal-to-Noise Ratio: 
Phono:  65 dB
Tuner, Aux :  73 dB
Tape IN :  73 dB
Residual Noise:  1,5 mV
Damping Factor:  50 at 8 Ω
Loudness Control:  +9 dB at 50 Hz; +4 dB at 10 kHz
Bass Control:  ±10 dB at 50 Hz
Treble Control:  ±10 dB at 10 kHz
High Filter:  _9 dB at 50 Hz
Phono Overload:  100 mV
Phono Equalizer:  RIAA ±0,5 dB
Crosstalk"  -45 dB at 10 kHz
Power Voltage:  100, 117, 220, 240 V AC, 50/60 Hz
Dimensions (W x H x D):  14" x 7,5" x 4,5"

Weight:  5,5 kg (12 lbs)
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