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

Pioneer SX-450

 Medium-Power Stereo receiver with FET FM Front End, PLL MPX, Precision Equalizer and High S/N Differential OCL Power Amplifier.
 Can your musical needs truly be met by a stereo receiver with as little RMS power output as 15 watts per channel? They can if you put your trust in the Pioneer SX-450. if your listening room is of average size, if your budget is modest, and if clean, low-distortion musical reproduction is your goal, the SX-450 is the medum-powered stereo receiver for you. Its solid stereo FM/AM section includes a PLL multiplex IC for wide and stable stereo FM separation. There's a low-noise FET coupled with a frequency-linear 3-gang variable capacitor to increase FM sensitivity, a 5-stage limiter to eliminate AM noise, and a special integrated circuit to improve AM tonal Quality. The phono equalizer features a big low 0,1% distortion, and the tone control section is of the CR type to permit super-quiet handling of all tonal adjustments.
Continuous power output of 15 watts min. RMS, at 8 ohms, 20 to 20,000 Hz  with no more than 0,5% total harmonic distortion. All things considered, this is an unusually good buy in stereo - the SX-450 from Pioneer.
Power Amplifier Section
Continuous Power Output (both channel driven, 20-20,000Hz): 15 watts per channel at 8 Ω
Total Harmonic Distortion (20 Hz to 20 kHz, from Aux)
Continuous Rated Power Output:  no more than 0,5%
1 watt per channel output, 8 Ω:  no more than 0,1%
Intermodulation Distortion (50 Hz : 7 kHz = 4:1 from Aux)
Continuous Rated Power Output:  no more than 0,5%
1 watt per channel output, 8 Ω:  no more than 0,1%
Damping Factor (20 Hz-20 kHz):  25
Input Sensitivity/Impedance
Phono : 2,5 mV/50 k Ω
Mic : 7,5 mV/50 k Ω
Aux : 150 mV/50 k Ω
Tape Play : 150 mV/50 k Ω
Tape Play (DIN) : 150 mV/50 k Ω
Phono Overload level (THD 0,1%):  150 mV (1 kHz)
Output Level/Impedance
Tape Rec : 150 mV
Tape Rec (DIN) : 30 mV/80 k Ω
Speaker : A, B, A+B
Headphone : Low Impedance
Frequency Response:
Phone (RIAA equalization) : 30 Hz to 15,000 Hz +0,5 -1 dB
Aux, Tape Play : 20 Hz to 60,000 Hz ±1 dB
Tone Control
Bass : +10 dB, -9 dB (at 100 Hz)
Treble : +9 dB, -10 dB (at 10 kHz)
Loudness Contur (Volume Control at -40 dB):  +6 dB (100 Hz); +3 dB (10 kHz)
Hum and Noise (IHF, short-circuited, A network, rated power)
Phono : 70 dB
Aux, Tape Play : 90 dB
FM Section
Usable Sensitivity [Mono/Stereo]:  11,2 dBf (2,0 µV) / 20,0 dBf (5,5 µV)
50 dB Quieting Sensitivity [Mono/Stereo]:  18,3 dBf/(4,5 µV) / 39,2 dBf (50 µV)
Signal-to-Noise Ratio at 65 dBf [Mono/Stereo]:  70 dB/ 65 dB
Distortion at 65 dBf
100 Hz [Mono/Stereo] : 0,15% / 0,3%
1 kHz [Mono/Stereo] : 0,15% / 0,3%
6 kHz [Mono/Stereo] : 0,4% / 0,4%
Frequency Response:  30 Hz to 15,000 Hz  +0,2 -2,0 dB
Capture Ratio:  1,0 dB
Alternate Channel Selectivity:  60 dB
Spurious response Ratio:  75 dB
Image response Ratio:  65 dB
IF Response ratio:  85 dB
AM Suppression ratio:  50 dB
Muting Threshold:  14 dBf (2,8 µV)
Stereo Separation:  40 dB (1 kHz), 30 dB (30 Hz - 15 kHz)
Subcarrier Product ratio:  40 dB
SCA Rejection Ratio:  40 dB
Antenna Input:  300 ohms balanced / 75 ohms unbalanced
AM Section
Sensitivity IHF [ferrite /external antenna]:  300 µV/m  / 15 µV
Selectivity:  35 dB
Signal-to-Noise Ratio:  50 dB
Image Rejection:  40 dB
IF rejection:  65 dB
Antenna:  Built-in Ferite Loopstick Antenna
Semiconductors:  1 FET; 3 ICs; 28 Transistors; 15 Diodes
Power Requirements:  110 -120 V, 220-240 V,  50/60 Hz
Power Consumption:  UL; 70 W, 130 W (max); CSA; 120 VA
Dimensions (W x H x D):  448 x 141 x 307 mm (17-4/8 x 5-9/16 x 12-1/16 inches)

Weight:  8,6 kg (19 lb) net

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