ONKYO Integra A-DS939

Commentary

This AV amplifier is a prestige model developed for the highest grade.

The Dolby Digital Decoder uses a 24-bit DSP developed by Motorola Inc. of the United States.
In the Dolby Digital System, all processing is done digitally, and the operation itself of the decoding processing DSP greatly affects sound quality. However, the Motorola DSP (56009) performs internal operation with accuracy of 24 bits or more and repeats complicated calculation with an operation capacity of 440 full bloom per second, ensuring sufficient accuracy as a Dolby Digital Decoder.
In addition, its low power consumption, low thermal fluctuation and low noise generation reduce the influence on analog circuits and ensure excellent dynamic range.

The Home THX Cinema position was created to make the most of the performance of Dolby Digital and to enjoy the sound field of the film mixing studio by the assumption, and the sound recorded in Dolby Digital can be reproduced on THX.
In order to achieve more realistic surround sound at home, it is equipped with DSP processing such as a cinema-re-equalizer that adjusts the high-frequency range to an appropriate level, timber-matching that adjusts sound from the front and sound from the rear to be heard smoothly, and dynamic decorrelation that creates the lowest surround sound field.

The power amplifier is equipped with a non-feedback circuit (NonNFB) that is not easily affected by the back electromotive force from the speaker.
Furthermore, based on the design philosophy of Integra, we carefully select key parts for circuit design, from transistors, capacitors, power transformers to resistors, and further develop and incorporate custom parts to improve sound quality.

The main settings of the AV amplifier (system setup, surround set, input selector set, etc.) are displayed on the screen and can be operated with a remote control.

Equipped with an Auto Room Acoustic Analizer (ARAA) function, the attached measuring microphone measures the Speaker Distance (the distance from the listening position to each speaker) and Level Calibration (the volume of each speaker) in approximately 1 minute and 30 seconds, and automatically sets the delay time of the signal from the speakers and the sound pressure of each speaker.
As a result, sound fields can be reproduced uniformly and the phase characteristics of each channel are improved, so that the sense of orientation and depth can be reproduced in the best condition.

It uses an IPM (Intelligent Power Management) system and automatically turns the power of the amplifier on and off when the power of the TV is turned on and off.
In addition, when it is turned ON, the surround mode set up in advance is called up (when another device is selected as the source, the power ON/OFF is not linked).

The Y/C MIX function is installed so that the Y/C separated video signal input to the amplifier at the S jack can be sent as a Y/C mixed signal called composite from the output of the RCA pin jack.

It has a built-in AC-3RF demodulator and reconverts the Dolby digital signal recorded by the conversion signal exclusively for LD into digital signal.

There are two types of speaker output, A and B, both of which can output five channels.

Model Rating

Type	Digital AV center
Amplifier Unit
Rated Output (THD 0.05% or less)	2-ch Drive : 160W + 160W (6 Ω, 20 Hz to 20 kHz) Surround Mode : 160Wx5 (6 Ω, 1 khz)
Maximum Practical Output (EIAJ, 6 Ω)	Front : 200W + 200W Center : 200W Surround : 200W + 200W
Dynamic Power	Front : 150W + 150W (8 Ω)
Total harmonic distortion factor	0.05% (at rated output)
Cross modulation distortion factor	0.05% (at rated output)
Input Sensitivity / Impedance	Phono MM : 2.5mV/50k Ω Line : 200mV/50k Ω Amp in : 1.0V/50k Ω
Output Level / Impedance	Rec out, Tape1, 2/Video1-3, 7 : 200mV/2.2k Ω Pre out : 1V/470 Ω
Frequency characteristic	Line : 20 Hz to 30 kHz ± 0.5 dB
S/N ratio (IHF-A)	Phono:80dB Line:100dB
Tone Control Maximum Change	Bass : ± 10 dB (50 Hz) Mid : ± 10 dB (300 Hz) Treble : ± 10 dB (10 kHz)
<Video Part>
Input / output sensitivity / impedance of standard image terminal	1Vp-p/75 Ω
I/O sensitivity / impedance of S video terminal	Y Signal : 1Vp-p/75 Ω C Signal : 0.28Vp-p/75 Ω
Tuner Section
Practical sensitivity of FM	Mono : 1.0 μ V/11.2 dBf Stereo : 2.0 μ V/17.2 dBf
SN ratio (FM)	mono:76dB stereo:70dB
Harmonic distortion factor (FM)	mono:0.1% stereo:0.2%
<General>
Power consumption (Electrical Appliance and Material Control Law)	530W
External dimensions	Width 435x Height 195x Depth 456 mm
Weight	21kg
Attachment	Wireless Remote Control Analyzer microphone