DENON PMA-890DG (1989) | Real time audio technology

An integrated amplifier equipped with real 20bit SLC D/A converter and optical Class A circuit. The D/A converter is a real 20bit super linear converter with independent left and right channels. It receives a 20bit 8x oversampling signal made by a digital filter and performs excellent D/A conversion. In addition, the difference in sampling frequency such as CD, DAT, and satellite broadcasting is automatically identified by the digital multi-interface circuit. Furthermore, the internal clock required for demodulation is made into a powerful 2PLL configuration to eliminate the influence of jitter (temporal fluctuation of digital signals). The PBS (Penta Block Separated) chassis structure, which separates the inside of the amplifier into 5 blocks for each basic circuit, is adopted, preventing the magnetic flux of the power block, the digital block, and the digital noise of the display block from jumping into other circuits. The power amplifier section is newly equipped with an optical Class A circuit. This circuit is a Class A circuit using optical elements to transmit the control signal sent from the bias control circuit to the bias circuit, eliminating mutual interference between the main signal system and the bias control circuit. The voltage amplification stage, which is important for driving the power amplification stage, is a three-stage differential amplifier, and the first stage adopts an extremely low-noise FET to achieve low noise and DC amplification, and the final stage of the power amplifier uses a high-speed, large-capacity transistor of Pc80W in parallel push-pull. The power supply section has improved instantaneous response capability. The power transformer adopts a 6.3kg heavy-weight large-scale shielded power transformer, and is equipped with a high-class, large-scale rectifier and electrolytic capacitor, as well as a 2-2 pure dynamic circuit that blocks power noise. It is equipped with a wide-range MC/MM equalizer amplifier that adopts a DC servo system and a source direct switch that can directly connect all input sources to the power amplifier, wideband real-time tone control, speaker terminal switching of a protection relay system, and a reset type high-speed protection circuit. It was available in black (PMA-890D) and gold finish (PMA-890DG).

Rated output: 110W+110W (20Hz-20kHz, 8ohm)

Total harmonic distortion: 0.004%

Frequency response: 4Hz-150kHz

D/A section

Total harmonic distortion: 0.0025%

Signal to noise ratio: 105 dB

Dynamic range: 100 dB

Dimensions: 470x181x420mm (WxHxD)

Weight: 19.4kg

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