ONKYO Integra A-927

Commentary

Pre-main amplifier that uses a non-feedback power amplifier that does not apply NFB.

In general amplifiers, NFB (negative feedback) is used to improve the distortion factor, expand the frequency band, and reduce the output impedance. The Integra A-927 eliminates NFB from the power amplification stage of the power amplifier section, and realizes low distortion factor over the entire band without relying on NFB.
In addition, the thermal stability has been improved by reviewing the temperature compensation circuit, and there is no need for a small resistor inserted in series on the output side of the normal amplifier, and the output impedance of the power amplifier has been reduced.

The power supply is equipped with a double-core laser transformer which is an evolution of the well-established laser transformer.
In this transformer, magnetic leakage is further reduced by combining two coil cores that are continuous in the rolling direction with the least magnetic resistance. In addition, by cutting off part of the core, the coil can be made into a cylindrical shape, making it possible to wind extremely thick copper wires without difficulty. This improves the power supply capability and realizes a power supply section that is resistant to instantaneous changes and continuous large current.
Blue capacitors are also used as block capacitors.

For tone control, Midbass Presence has been added in addition to the conventional Bass/Treble.
Midbass Presence can adjust mid-to-low frequencies from 200 Hz to 300 Hz that cannot be compensated by traditional tone controls, so you can complement the sense of fullness in your room and the reality of your vocals.
You can also make effective adjustments when you boost the bus control and it is difficult to hear because it is also boosted to the middle and low frequencies.
In addition, the Treble control is a double-axis type that can be adjusted independently on the left and right.

It is equipped with a direct selector that bypasses the tone circuit. In addition to the tone position and direct position, it is also equipped with a power amplifier direct position that can be input directly to the power amplifier from the dedicated terminal via the volume only.

The volume uses a 4-series detent volume that can be configured with dedicated circuits for tone position and direct position respectively.
Assuming that this volume is actually used at home, the rise of the attenuation curve has been made gradual and the input sensitivity has been revised to obtain the lowest operational feeling.

WIMA film capacitors and high-precision carbon resistors are used in the main parts related to sound quality.
The copper foil used for printed circuit boards, which make up major circuits, is 70 microns thick, twice as thick as ordinary copper foil, in an effort to improve quality.

The internal structure is designed to minimize the signal path from input to output and to construct a reasonable power supply line.
Each block has a rigid box-shaped structure and is connected to each other to increase the strength of the chassis as a whole. In addition, with an emphasis on vibration analysis, irregular ribs are provided everywhere to ensure strength and disperse resonance.

The MM/MC phono equalizer is also available for analog players.

Equipped with a step-type balance control, Rec selector and subsonic filter.

MDF is used for the hood to protect the sides and top.

Model Rating

Type	Pre-main amplifier
Rated output	160W + 160W (4 Ω, 20 Hz to 20 kHz) 100W + 100W (8 Ω)
Dynamic Power	335W + 335W (2 Ω) 225W + 225W (4 Ω) 170W + 170W (6 ohm, 1 khz)
Total harmonic distortion factor	0.04% (at rated output, 8 Ω, 20 Hz to 20 kHz)
Cross modulation distortion factor (70Hz:7kHz=4:1)	0.04% (8 Ω at rated output)
Damping factor	150 (8 Ω, 20 Hz to 20 kHz)
Signal-to-noise ratio	Phono MM:87dB Phono MC:70dB CD, Tuner, Line, Tape : 105 dB Direct, Power Amp Direct : 117 dB
Input Sensitivity / Impedance	Phono MM : 3.0mV/47k Ω Phono MC : 300 μ V/100 Ω CD, Tuner, Line, Tape : 300mV/25k Ω Direct, Power Amp Direct : 500mV/25k Ω
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law)	230W
External dimensions	Width 445x Height 165x Depth 434 mm
Weight	18.0kg