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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-730


Non - NFB Direct - A High Output Integrated Amplifier
Superior non-NFB type amplifier, 60 W output per channel
Non-NFB circuit eliminates the primary causes of dynamic distortion such as time delay.
A heavy-duty power supply maximizes non-NFB circuitry performance.


Specifications:
Rated Power Output:  60 + 60 W at 8 Ω both channel drive 20 - 20,000 Hz
Total Harmonic Distortion:  0,05% 920 - 20,000 Hz at rated output 8 Ω load)
Intermodulation Disstortion (7 kHz /60 Hz : 1/4):  0,002% (at amplitude output equivalent to rated output)
Output band Width:  5 Hz - 80 kHz (IHF THD 0,1%)
Transmission Characteristics:  4 Hz - 150 kHz +0 dB -3 dB at 1 W output
Input Sensitivity/Impedance:  150 mV/47 k Ω
Output Impedance:  0,01 Ω
Output Trminals: 
Speaker :  A or B (4 - 16 Ω); A + B (8 - 16 Ω)
Headphones :  230 mW/ 8 Ω
Equalizer Amplifier Output:
Maximum Output :  10 V at 47 k Ω
Rated Output :  150 mV
THD :  below 0,002% at 1 kHz , 8 V output
Input Sensitivity/Impedance:
Phono MM :  2,5 mV/47 kohm
Phono MC :  200 µV/100 Ω
Tuner :  150 mV/47 k Ω
Aux, Tape :  150 mV/47 k Ω
RIAA Deviation:  Phono within ±0,3 dB (20 Hz - 100 kHz)
Signal-to-Noise Rtaio:
Phono MM :  86 dB (input terminals short-circuited for 2,5 mV input)
Phono MC :  70 dB (input terminals shirt-circuited for 250 µV input)
Tuner, Tape, Aux :  106 dB
Tone Control:
Bass :  100 Hz +_8 dB
Treble :  10 kHz ±8 dB
Loudness Characteristics :
Low Frequency :  100 Hz +7 dB
High Frequency :  10 kHz +6 dB
Power Source:  120 V, 200 V, 220 V, 240 V, 50/60 Hz
Power Consumption:  150 W (USA), 220 W (other)
AC Outlet :  2 x 100 W switched; 1 x 250 W unswitched
Dimensions (W x H x D):  434 x 112 x 390 mm
Weight:  9 kg