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-610
The  RA-610 is equipped with every conceivable control and feature any demanding audiophile ever hopes of having on his unit. The RA-610 was designed for both the versatility and ease of operation. It will add professional studio flexibility to your present music center.
The performance of RA-610 is exceptional it will allow you to experience true high fidelity as never before. its full and natural stereo phonic reproduction offers you musical entertainment  rivaling that of live performances.

Special Features:
Direct Coupling Output Circuit eliminates the need for an output capacitor, thereby, permitting better frequency response at lower IM distortion.
Differential  Amplifier provides higher stability and lover distortion
Split Power Supplies for left and right channels decrease frequency damping factor and overall distortion.
Tone Defeat switch offers absolute flat response
-20 dB Muting switch provides instataneous quietness
Tape Monitor switch for tape playback and recording
Dual slide tone controls for Bass and Treble offer easy and accurate tone adjustment.
High and Low Filter switches, -9 dB cutoff, for eliminating rumble and scratch noises.
Loudness switch for boosting extreme low frequencies during low volume operation
Two pairs ofm agnetic input jacks for two sets of record players with different input impedances.
Pre-amplifier Outputs for use with separate power amplifier or multi-channel system
Main-amplifier Inputs for use with separate control amplifier or tape recorder.
Front Panel Stereo headphone Jack for easy use
Two speaker Selector switches for individual or simultaneous operation of two speaker systems
Handsame Wood Cabinet.

specifications
Power Output:
Total Music Power (IHF):  120 watts at 4 ohms;  90 watts at 8 ohms
Continuous Power (RMS):  32 watts/channel, 8 ohms at each channel driven
Distortion :
Harmonic :  less than 0,1% at rated output
Intermodulation :  less than 0,1% at rated output  (70 Hz : 7,000 Hz = 4 : 1)
Frequency Response:
Main Amp. ONly :  3 Hz to 1000,000 Hz +0 db to -3 dB
Auxiliary Inputs :  5 Hz to 90,000 Hz +0 dB to -3 dB
Power Bandwidth (IHF):  3 Hz to 55,000 Hz
Input Sensitivity (at rated output)/ Impedamce:
Phono 1 :  2,5 mV/50 k Ω
Phono 2 :  2,5 mV/100 k Ω
Tuner :  120 mV/25 k Ω
AUX 1, 2 :  120 mV/25 k Ω
Tape In :  120 mV/25 k Ω
Main Amp. Input :  650 mV/35 k Ω
Signal-to-Noise Ratio :
Phono 1 :  65 dB
Phono 2 :  65 dB
Tuner:  80 dB
Aux 1 , 2, Tape In :  80 dB 
Residual :  1 mV
Square Wave Rise Time:  2,2 microseconds
Damping Factor:  35 at 8 ohm;  70 at 16 ohm
Output Impedance:
Speaker terminals :  4, 8, 16 ohms at full rating
Pre-amp Output :  50 ohms
Loudness Switch :  +10 dB at 50 Hz
High Filter : -96 dB at 10 kHz
Low Filter :  -9 dB at 50 Hz
Muting:  -20 dB at 1 kHz
Bass Control:  +15 dB to -13 dB at 50 Hz
Treble Control:  +14 dB to -16 dB at 10,000 Hz
Phono Overload:  over 100 mV
Phono Equalizer:  +17 dB at 50 Hz
Cross-Talk:  60 dB at 1 kHz
Dimensions (W x H x D):  16-1/4 x 8-3/4 x 4-7/8 inch
Weight:  13,2 lbs


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