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-611

 Here is RA-611, a truly sophiscated pre-main amplifier created for excellent stereo listening, at surprisingly reasonable cost. Not only it hasinherited all the outstanding performances of the predecessor RA-610,but also it is incorporated with much more improved electronics.  And convenient features. The amplifier then offers greter versatility and simplicity of usage not found in those at comparable price.
Think of its modest power of 30 W x 2 continuous RMS both channels driven. The distortion that is way below 0,1% at normal listening. The phono overload that is amazing at 100 mV. And the power bandwidth that is really wide from 5 to 50,000 Hz. Look at the controlsand the connections; you can play two tape recorders and dub each other with a flick of switch, two record players, and two auxiliary components. To suit your listening taste, thers are many controls for simple operation.
Powerful 140 watts (IHF) to generate amazingly transparent sound
Split electric power supply system
Direct coupled circuitry
Versatility in controls and simplicity in operations
Handsomely trimmed aluminum extrusion panel
Controls layout designed with optimum human engineering
Rotary - Speakers, Monitor, Selector and Volume
Slide - left and right Bass, left and right Treble, and Balance
Pushbuttons - Power, Low Filter, High Filter, Tone Defeat, Mode, Loudness and Audio Muting
Convenient headphone jack and power beacon
Facilities for two magnetic phonos, tuner, two tape recorders and two auxiliary components
Professional tape dubbing feature - from tape 1 to tape 2 or reverse
Three convenient AC outlets
Wood cabinet included
Total Music Power (IHF):  140 W at 4 Ω
Continuous Power RMS (all at less than 0,5% THD and 1 kHz ):
42 W + 42 W each channel driven at 4 Ω
35 W + 35 W each channel driven at 8 Ω
37 W + 37 W both channel driven at 4 Ω
30 W + 30 W both channel driven at 8 Ω
Harmonic Distortion:  less than 0,1% at 27 W + 27 W into 8 Ω
IM Distortion:  0,15% before clipping at 8 Ω
Frequency Response:  5 to 100,000 Hz, -3 dB at 8 Ω
Power Bandwidth:  5 to 55,000 Hz, IHF at 8 Ω
Input Sensitivity/Impedance:
Phono ! :  2,5 mV/47 k Ω
Phono 2 :  2,5 mV/47 k Ω
Tuner :  150 mV'40 Ω
Aux 1, Aux 2 :  150 mV 40 k Ω
Tape Monitor IN :  230 mV/47 k Ω
Main Amp In :  800 mV/33 k Ω
Tape DIN :  330 mV / 100 k Ω
Signal-to-Noise Ratio:
Phono :  65 dB
Aux :  70 dB
Tuner, Tape In "  70 dB
Residual Noise: 1 mV
Damping Factor:  35 at 8 Ω
Loudness Control:  +10 dB at 50 Hz; +4 dB at 10 kHz
Bass Control :  ±10 dB at 10 kHz
Treble Control :  ±10 dB at 10 kHz
High Filter :  -10 dB at 10 kHz
Low Filter : -10 dB at 50 Hz
Muting Level:  -20 dB
Phono Overload:  over 100 mV
Phono Equalizer:
=17 dB at 50 Hz
-13,5 dB at 10 kHz
Crosstalk :  -40 dB at 10 kHz
Power Voltage "  AC 100, 117, 220, 240 volts
Dimensions (W x H x D):  16-1/2" x 5" x 9-1/2")
Weight:  12 lbs

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