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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-720 AE


The PMA-720AE is equipped with an Advanced HC (High-Current) Single Push-Pull Circuit that enforces Denon’s design concept for pure audio amplification. This design ensures that you hear delicate musical details, reliably supported by plenty of power. Playback faithful to the original sound is also made possible by a circuit board layout that can handle the greater power from the amplifier section and appropriately respond to the output level and unique character of the signal. In addition, the internal construction of the PMA-720AE has been carefully designed to prevent unwanted vibration from adversely affecting the audio signal.

Features:
Advanced High Current (AHC) Single-Push-Pull Circuit for musical detail and power
High-speed, high-capacity power supply circuit for AHC Single-Push-Pull
Wide dynamic range, supporting high-grade audio sources
Main transformer with separate power supplies for audio and control circuits
New higher quality speaker terminals – two pairs
The Micro-processor
Newly-designed remote unit

Specifications:
Rated output :
50 W + 50 W at (8 Ω , 20 Hz - 20 kHz, THD 0.07 %)
85 W + 85 W at (4 Ω , 1 kHz, THD 0.7%)
Total Harmonic Distortion;  0.01% (8 Ω , 1 kHz)
Preamplifi er Section
Input Sensitivity/Impedance:  120 mV / 47 kohms
Frequency Response: 10 Hz - 100 kHz — +1, –3 dB (DIRECT mode)
Signal-to-Noise  Ratio:  107 dB (IHF-A weighted, DIRECT mode)
Line ;  107 dB
Phono :  86 dB
Power Supply:  AC 230 V, 50 Hz
Power Consumption:  200 W (Standby 0.3 W, CEC standby 3 W)
Dimensions (W x H x D): 434 x 121 x 308 mm
Weight:  7.1 kg