Denon PMA-720AE Integrated Amplifier
Denon PMA-720AE Integrated Amplifiers delivers a superior sound quality incorporating advanced circuitry that greatly enhances the reproduction of sound to achieve original quality. The PMA-720AE is built with advanced and smart technology in its beautiful design and Denon's Direct Mechanical Ground Construction.
Denon PMA-720AE Integrated Amplifiers 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.
The amplifier circuitry employs an HC transistor with 3 times greater current capacity compared with conventional transistors, a significant new advance. A strictly-selected Dual FET is used in the input stage of the power amp to achieve greater stability in operation. And a new Schottky-barrier diode, with 1.5 times the current capacity of conventional models and superior capability to supply current instantaneously, has been incorporated in the power circuit to ensure a consistently stable, beautiful sound.
The PMA-720AE’s power circuit uses a block capacitor that Denon engineers have jointly developed with a parts manufacturer and a Schottky-barrier diode that features low internal resistance for low loss, short recovery time, and negligible rectifying noise. This highly stable electrical current supply further brings out the expressive power of sound produced by the Advanced HC Single-Push-Pull Circuit.
The power transformer alone produces considerable vibration. A new 1.6 mm thick copper plate has therefore been added between the chassis bottom and the power transformer to suppress vibration from the power transformer and also prevent external vibrations from affecting the transformer. The positioning of the power transformer to a location near the insulating feet directs vibration as quickly as possible away from the chassis bottom to the feet, minimising its effects on other electrical circuits nearby and the heat sink.
The coiled wire of the power transformer for the audio signal and control circuits has been separated to eliminate mutual interference and adverse influences on sound quality. The PMA-720AE also has a prepared transformer to minimise power consumption during remote power-off standby and improve environmentally friendly performance.
The PMA-720AE employs Denon’s Signal Level Divided Construction (SLDC) in which the circuits for small and large signals, the microprocessor, and other circuits are separated in an ideal manner to minimise mutual interference.
The Microprocessor Stop Mode automatically stops all operations of the microprocessor when it is not needed during playback. By stopping the oscillation of the microprocessor’s clock during normal listening, the audio signal is protected from noise and the quality of sound is improved.
The screw-type transparent terminals hold cables securely to minimise signal degradation. Switching between A and B speaker systems is also possible.
The PMA-720AE’s tone circuit, power amplifier circuit and other areas have been fine-adjusted to secure a frequency response of up to 100 kHz during actual use. Also, improvements in the volume circuit suppress noise in the amplifier to achieve high sonic resolution. These features and others give the PMA-720AE plenty of latitude to handle the wide dynamic range of high-grade audio sources such as Super Audio CD and DVD-Audio.
The PMA-720AE includes a Source Direct function that allows the audio signal to bypass the Bass, Treble, Loudness, and Balance control circuits and maintain its purity for optimum sound transparency during playback. This Source Direct function works for all input sources.
The relay switch used for CD and Phono input contains an inert gas to prevent the occurrence of noise that can negatively affect the signal. In addition, highly reliable parts strictly selected for their contribution to sound quality, such as the large-capacity block capacitor for the power supply circuit, high-quality sound carbon resistors, and high-quality sound capacitors, are also used. Each individual part employed in configuring the circuits reflects this emphasis on high sound quality.
The PMA-720AE’s system remote handset controls the main volume, function switching, muting, and remote power on/off (linked with an AC outlet). The system remote also controls Denon CD players and network players.
When no signals or operations are detected for a certain period of time, the PMA-720AE automatically switches to standby mode where power consumption is at its lowest level. Auto-standby ensures that electricity is not wasted.
|Power Amplifier Speaker Channels||4 Channel|
|Frequency Response||20 Hz - 20 kHz|
|Watts RMS per Channel (Continuous)||50 Watts|
|Watts RMS per Channel (4 Ω)||85 Watts|
|Watts RMS per Channel (8 Ω)||50 Watts|
|Minimum Impedance||4 Ω|
|Total Harmonic Distortion (THD)||0.07 %|
|Number of Inputs||5|
|Warranty||Australian Manufacture Warranty|
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