Audio Database

The

ONKYO Integra A-927
95,000yen(1997 release)

Description
 
The Integrated Amplifier which adopted the unreturned power amplifier to which NFB is not applied.

Although NFB (negative feedback) is used for common amplifier for the modification of a distortion, the expansion of a frequency band, and the reduction of an Output load impedance,In Integra A-927, NFB was eliminated from the power amplification stage of the power amplifier part, and low-distortion-ization is realized over all the bands, without depending on NFB.
Moreover, the heat stability is also improved by the review of the temperature-compensation circuitry, the necessity also of the small resistor usually inserted in the output side of amplifier in series was lost, and the reduction of the Output load impedance of power amplifier is also attained.

The double core laser transformer to which the acknowledged laser transformer was further evolved from the former is carried in the power-source part.
By this transformer, magnetic leakage is further reduced by combining two cores of the shape of a coil which continued in the fewest rolling orientation of magnetic reluctance. Moreover, by having cut a part of core, form of a coil can be used as a cylinder type and it is possible to also coil very-thick copper wire reasonable. Powering capacity improved by this and the power-source part strong also against a continuous large current is realized also to the momentary transition.
Moreover, the blue capacitor is adopted as a block capacitor.

Midbass Presence other than conventional Bass/Treble is added to the tone control.
In Midbass Presence, while being unable to rectify by the conventional tone control, a low-pass (200Hz - 300Hz) coordination is possible. It is filled with the room by this, and a complement of admiration or a feeling of actual existence of vocal is possible.
Furthermore, an effective coordination is possible when it is simultaneously boosted to inside low-pass when birth control is boosted, and it is hard to hear it.
Moreover, the right-and-left independency was achieved and the Treble control has adopted the double axis type which can be adjusted.

The direct selector which bypasses a tone circuitry is carried and the power amplifier direct position which can be direct inputted into power amplifier only through a volume from an exclusive termination in addition to a tone position and a direct position is also carried.

The 4-unit Detent volume which can constitute a dedicated communication circuit into a tone position and each direct position is adopted as a volume.
Supposing the real busy condition in a house, this volume makes the riser of a damping curve loose, and is also performing the review of Input sensitivity so that a minimum feeling of an operation may be obtained.

The WIMA film capacitor and the high precision carbon resistor are supplied to the main parts in connection with a tone quality.
Moreover, thickness of 70 microns which becomes twice usual is used for the Copper foil of the printed circuit board which constitutes main circuitries, and it is attaining quality improvement.

Consideration is carried out so that the internal structure can constitute a rational powering line with shortest-ization of the signal path from an input to an output.
Each block considers it as a structure with firm TAP-box form, and the intensity of the whole chassis is raised by making it combine with each other. Furthermore, with emphasis also on vibration analysis, an infinite form rib is prepared everywhere and strong reservation and a variance of the vibration are aimed at.

In order to correspond also to an analog player, the man month/MC phone equalizer is carried.

The step type balance control, the Rec selector, and the Subsonic Filter are carried.

MDF is used for the bonnet which protects the side and the upper surface.

Rear
Internal Double
Blue

Rating of a mode
Form Integrated Amplifier
Output power 160W+160W (4 ohm, 20Hz - 20kHz)
100W+100W (8ohm)
Dynamic power 335W+335W (2ohm)
225W+225W (4ohm)
170W+170W (6 ohm, 1kHz)
THD 0.04% (at the time of an Output power 8 ohm, 20Hz - 20kHz)
Cross modulation distortion
(70Hz:7kHz=4:1)
0.04% (at the time of an Output power 8ohm)
Dumping factor 150 (8 ohm, 20Hz - 20kHz)
SN ratio Phono MM:87dB
Phono MC:70dB
compact disk, Tuner, Line, Tape: 105dB
Direct, Power Amp Direct: 117dB
Input sensitivity/impedance Phono man month: 3.0mV / 47kohm
Phono MC: 300 microvolts/100 ohm
compact disk, Tuner, Line, Tape:300mV /, 25kohm
Direct and Power Amp Direct:500mV /, 25kohm
Supply voltage AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 230W
Dimensions Width 445x height 165x depth of 434mm
Weight 18.0kg