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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





Denon PMA-550 amplifier

Denon Integrated Amplifier model PMA-550 is rated at 100 watts per channel, with both channels driven into 8 Ω, and a total harmonic and intermodulation distortion below 0,005 percent. The unit may be direct-coupled from input to output by means of a front-panel switch, and it incorporates electronic switching for input sources, a separate record-out selector that permits the user to listen to one source while recording another, a subsonic filter, defeatable tone controls, and switching for two sets of speakers. Phono overload levels are 160 millivolts for the moving-magnet, and 8 millivolts for the moving-coil phono sections. Phono Signal-to-Noise ratios are 89 dB for MM and 73 dB for MC.
Specifications
Rated Output (both channels driven): 
100 W + 100 W (20 Hz - 20 kHz, 8 Ω, T.H.D. 0,005%)
140 W + 140 W (1 kHz, 4 Ω, )
Total Harmonic Distortion:  less than 0,005%
Intermodulation Distortion:  less than 7 kHz/60 Hz :1/4, 0,008% (at amplitude output) equivalent to rated output)
Power Bandwidth:  5 Hz - 100 kHz (IHF T.H.D. 0,035%)
Transmission Characteristics:  1 Hz - 400 kHz +0 -3 dB ( at 1 W output)
Input Sensitivity:  150 mV
Input Impedance:  40 k Ω
Output Impedance:  0,1 Ω ( 1 kHz)
Signal-to-Noise Ratio (IHF A Network):  108 dB ( Input terminals short circuited)
Output Terminals:  
Speaker :  A & B load 4 - 16 Ω,  A + B load 8 - 16 Ω
Equalizer Amplifier Output (Rec Out Terminal):
Maximum Output :  10 V (at 50 k Ω load)
Rated Output :  150 mV
Total Harmonic Distortion :  bellow 0,001% ( at 1 kHz, 8 V output)
Input Sensitivity/Impedance:
Phono 1 (MM) :  2,5 mV/ 50 k Ω
Phono 2 (MC) :  125 µV/100 Ω
Tuner :  150 mV/40 k Ω
Aux, Tape :  150 mV/40 k Ω
RIAA Deviation:
Phono 1 (MM) :  within ±0,2 dB ( 20 Hz - 100 kHz)
Phono 2 (MC) :  within ±0,2 dB ( 20 Hz - 100 kHz)
Signal-to-Noise Ratio (IHF A Network):
Phono 1 (MM) :  90 dB ( input terminals short-circuited at 2,5 mV inpit)
Phono 2 (MC) :  73 dB (input terminals short-circuited at 250 µV input)
Tuner, Tape, Aux :  108 dB ( input terminals short-circuited)
Tone Control
Bass :  100 Hz ±8 dB
Treble :  10 kHz ±8 dB
Equalizer Subsonic:  18 Hz , 6 dB/oct
Loudness Characteristics:
Low Frequency :  100 Hz +7 dB
High Frequency :  10 kHz +6 dB
Power Source:  AC 120 V, 60 Hz ; 220 - 240 V 50/60 Hz
Power Consumption: 740 W at maximum output (IEC)
Dimensions (W x H x D):  434 x 132 x 407 mm
Weight:  13,5 kg
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