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 RX-404

 AM/FM Stereo Receiver RX-404 Features:
Direct-coupled Darlington OCL complementary power amplifier
Plus-minus split power supply
Class A operation direct coupled NF tone control amplifier
FM MOS FET front-end for high sensitivity.
FM PLL MPX section
FM LF section with IC, ceramic filters and quadrature detector
Two direct-reading peak power meters
Dual-function tuning meter
Tape monitor
FM muting switch
Stepped volume and bass / treble controls
Loudness switch and subsonic filter (12 dB/oct)
Specifications:
Power Amp Section
Power Output: 
30 watts per channel min. RMS both channels driven into 8 Ω from 20-20,000 Hz with no more than 0,06% THD
34 watts per channel min. RMS both channels driven into 4 Ω from 20-20,000 Hz with no more than 0,06% THD
Intermodulation Distortion (50 Hz : 7,000 Hz = 4:1): 
No more than 0,1% (Continuous rated power )
No more than 0,05% (15 watts per channel power output, 8 Ω)
No more than 0,05% (1 watt per channel power output, 8 Ω)
Total Harmonic Distortion: 
No more than 0,1% (Continuous rated power )
No more than 0,05% (15 watts per channel power output, 8 Ω)
No more than 0,05% (1 watt per channel power output, 8 Ω)
Damping Factor:  40 (20-20,000 Hz 8 Ω)
Pre Amp Section
Input Sensitivity/Impedance: 
Phono :  2,5 mV/47 k Ω
Aux, Tape In :  150 mV/33 k Ω
Overload Level (max. Input level, THD 0,5%, 1 kHz):
Phono :  160 mV
Aux :  not less than 5 V
Output Level/Impedance:
Tape Out :  300 mv/600 Ω
Tape Out (DIN) :  100 mv/90 k Ω
Frequency Response:
Phono :  30 Hz - 15,000 Hz ±0,4 dB (RIAA)
Aux, Tape In :  8 Hz - 45,000 Hz +0,3 -2,0 dB
Hum and Noise (IHF, A-network rated power):
Phono :  75 dB
Aux, Tape In :  85 dB
Tone Cotrol
Bass :  ±10 dB at 50 Hz
Treble :  ±10 dB at 20 kHz
Low Filter (Subssonic):  16 Hz (12 dB/oct)
Loudness Contour:  +10 dB at 100 Hz/ +4 dB at 10 kHz
FM Tuner Section
Usable Sensitivity:
Mono :  10,8 dBf (1,9 µV/300 Ω)
Stereo :  18,8 dBf (4,8 µV)
50db Quieting Sensitivity:
Mono :  16,8 dBf (3,8 µV)
Stereo :  38,2 dBf (44 µV)
Signal-to-Noise Ratio: 
Mono :  70 dB (at 65 dBf)
Stereo :  65 dB
Distortion (65 dBf):
At 100 Hz [mono/stsreo];  0,15%/0,25%
At 1 kHz [mono/stsreo] :  0,15%/0,25%
At 6 kHz [mono/stereo] :  0,25%/0,35%
Frequency Response:  30 Hz to 15,000 Hz +1 -3 dB
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  60 dB
Spuriouss Response Ratio:  70 dB
Image Response Ratio:  50 dB
IF Resposne Ratio:  65 dB
AM Supression Ratio:  55 dB
Stereo Separation:  40 dB (at 1 kHz); 30 dB (from 50-15,000 Hz)
Subcareier Product Ratio:  55 dB
SCA Rejection Ratio:  60 dB
Antenna Input:  300 Ω (balanced); 75 Ω (unbalanced)
AM  Tuner Section
Sensitivity: 
AM :  250 µV/m
LV :  550 µV/m
Selectivity:  23 dB
Signal-to-Noise Ratio:  45 dB
Image Response Ratio:  38 dB
IF Response Ratio:  40 dB
Antenna:  Built-in ferrite loopstic antenna
Miscellaneous:
Power Supply:  110-120 V, 220-130 V AC, 50/60 Hz
Power Consumption:  220 watts (max)
Dimensions (W x H x D):  430 x 145 x 316 mm (16-15/16" x 5-11/16" x 12-7/16")
Weight:  8,0 kg (17 lbs)

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