Audio Database

The pictorial image of Grand Integra M-510

ONKYO Grand Integra M-510 850,000yen(1984 release)
900,000yen(around the 1991 time)

Stereo power amplifier which supplied technologies, such as a double transformer drive scheme, and was developed in order to enable an ultimate music play.

With common amplifier, the electric current from which the phase shifted according to the property of the speaker comes back to the amplification part of amplifier through flux, a grounding, or a B supply. The signal with which this phase shifted wears to an input signal, and what the phase was mixed and existed works as an input signal. For this reason, the right phase information includeded in the music intelligence from the first will be confused, and the feeling of sound field which is taking out the delicate phase difference will also be disturbed.
In M-510, in order to keep that from which the phase shifted from returning to an amplification part, a transformer called an in phase transformer is carried in the path of an electric current. By this in phase transformer, if the wave-like electric current in the positive side flows, the same wave-like electric current will flow into the negative side exactly by it at an opposite phase. Thereby, the positive and negative side controls, is mutually and only the excessive component which rode and came back to the power-source electric current is canceled. Braking of the bass was improved by this and the outstanding bass play is realized.
Moreover, by the in phase transformer, the fogging of the flux generated from a power-source part is stopped, and the play capacity of Loule Bell is also improving.

A power transformer on either side is made to become independent, and it has three power transformer composition by using another transformer for power sources other than a signal system. Furthermore, since the in phase transformer is carried in the power circuit on either side, it has composition by five transformers in total.

Four capacitors of the capacitor of 33000 micro F/100V are used for a power-source part, and the original vibration proof structure is adopted as a fixture.
According to the location and the quality of the material of the belt which fixes a capacitor, this is what noted that sound changed, and it is using the original mounting arrangement which suppresses the oscillation by sound pressure, newly developing it.

14 片 channels are using the high power transistor for an output stage.

The printed circuit board of a glass epoxy resin is adopted as the substrate of the circuitry for the Lords.

The power meter of a right-and-left independency is carried in the front panel.
The meter can perform a change and ON/OFF of a range, and also can also switch an illumination by a two-step.

Two input terminals, a variable input with a volume and a fixed input, are carried.

37 copper wire 0.26mm in diameter was twisted on AC cable, and leakage flux was canceled on it, and also the large-current capacity low-impedance cable which suppressed the vibration by the double sleeve is adopted as it.

The weighting indicator is carried and the status of the warmup at the time of the power source ON can be checked.
The preheating organization by increasing an idling electric current temporarily works, and the warmup time is shortened in about 10 minutes.

Internal Five
Output The
The The
The reactive loading imitating the phase response of the speaker is in the direction on a photograph. The trial production and the experiment of an in phase transformer piled up using this.
The transformers reflected to a photograph are some transformers made as an experiment.

Rating of a mode
Form Stereo power amplifier
<Amplifier part>
Output power
(20Hz - 20kHz, both channel drive)
500W+500W (4ohm)
370W+370W (6ohm)
300W+300W (8ohm)
THD (20Hz - 20kHz) 0.005% (at the time of an Output power)
Cross modulation distortion (70Hz:7kHz=4:1) 0.003% (at the time of an Output power)
Power bandwidth (IHF-3dB, THD 0.2%) 5Hz - 100kHz
Gain 33.8dB
Frequency characteristic 1Hz-100kHz+0 -1.5 dB
Input sensitivity 1V (at the time of an Output power)
0.058V (at the time of 1W output)
Input impedance 20kohm
SN ratio (A correction, input short-circuit) 120dB (at the time of an Output power)
Load impedance 1ohm-16ohm (music)
4ohm-16ohm (Electrical Appliance and Material Control Law specification succession)
Dumping factor 300 (8 ohm, 50Hz)
Input terminal Variable: One line
Direct: One line
Output-terminal Speaker: Two lines
<Meter part>
Range switching x1 (0dB=300W)
x0.1 (0dB=30W)
Indicating range x1 range: 0.01W-800W
x0.1 range: 1W-80W
- 40-+4dB
Indication precision 0±1dB
- 10±2dB
- 20±3dB
Speed of response 100microsec (-infinity->0dB)
Carriage-return velocity 1sec (-0dB->-20dB)
Power source AC100V, 50Hz/60Hz
Power consumption 720W (Electrical Appliance and Material Control Law specification)
160W (at the time of a non-signal)
Dimensions Width 507x height 264x depth of 512mm
Weight 63kg