Audio Database

The pictorial image of Integra M-588

ONKYO Integra M-588
300,000yen(around the 1992 time)

Description
 
Stereo power amplifier which adopted the super balance circuit.

The original double differential-amplification circuitry of Onkyo and the super balance circuit completed combining the double super servo are carried. This corresponds without using a conversion circuit for neither a balance input or an imbalanced input nor a balance load intensity and an imbalanced load intensity.
Moreover, even if the criteria potential of an output signal is shifted and either of the outputs is grounded by the double super servo technology, fixed gain and maximum output are always obtained.

Not only a power amplifier part but the twin mono-construction which carried out full independence to the input switching, the level control, and the meter circuitry is adopted.
From each L/R and the center of a chassis, the full separation of the component-partses layout was carried out, it is arranged right and left, and, also in the property top, such as using the substrate which achieved the L/R independency, the power amplifier part and the power-source part are attaining symmetrical-ization.
Moreover, in order to shortest-ize the signal path inside a chassis and to keep it ideal, while arranging a power-source part to the chassis front part and shortest-izing the path from an input terminal to an output-terminal, the noise of the power-source part is stopping the ill effect which it has on a small level signal part to the minimum.
Furthermore, an input level control was not prepared in a balance input terminal, but it was made to make a direct interconnection with a preamplifier etc., and the failure of the tone quality is prevented.

In the power-source part, in order to aim at the improvement in a power-source speed of response property, the multi-chemicon scheme (20,800 micro F per piece channel) which carried out 4 parallel connection of the low-impedance electrolytic capacitor which carried out the splitting volume of the low scaling-factor foil is adopted, and powering capacity is raised.
Moreover, mass (15A) bridge rectifier diode about 2.5 times the ratio of this is conventionally adopted as diode, a loss is reduced in operating an element with a margin, and source impedance is kept low.
Furthermore, to a transformer, a large-sized LASER transformer is symmetrically separated from a signal system, and is arranged to it, and the interference of leakage flux (magnetic induction) is suppressed.
This LASER transformer is equipping with the iron cases which in addition to the deformation EI core which made the perimeter part broad and reduced magnetic reluctance used silicon copperplate shielding material for the perimeter of the core, and shielded severely, and also served also as the shielding, and is reducing leakage flux or less to 1/30.

The peek special-NetWare-program meter which the riser controlled early so that return became somewhat late is adopted as the deflection of the pointer of a power meter. The Direct reading of the power at the time of an 8-ohm load intensity can be carried out with the tick mark of a power window, and also the Dej Bell window is possible.
Furthermore, the automatic range adjuster is adopted, the dynamic range of a music signal is judged automatically, and the pointer of a power meter is set to a range which is the easiest to read.
If it becomes the output that the output of an 8-ohm load intensity exceeds 40W (it is +3dB with x0.1 range) on the basis of x0.1 range (0dB=20W), it will change to x1 range (0dB=200W) in an instant. If 40W is not exceeded in several seconds after that, it returns from x1 range to x0.1 range.
Moreover, also when the Dainyuu power enters suddenly, it changes to x1 range, and the scaleover of meter is prevented, and it becomes x0.1 range at the time of the Koide power.

In order to realize a L/R full separation, the meter circuitry consists of L/R dedicated communication circuits including a power circuit.
Moreover, only the control circuit to be synchronized, such as a range switching, carried out L/R in common, and L/R is electrically separated by carrying out the optical transmission of the control signal.
Moreover, in the protector circuitry, the L/R independency of the sensor which detects the leakage of an overload or DC component is achieved, the optical transmission of between common protector circuitries is carried out, and the cross interferencee between channels is suppressed.

The parts selected carefully are adopted and it is a super-low-distortion carbon resistor of conventional ratio-40dB,The custom-made Detent volume which put into practice measures against a tone quality, such as a gilding slide child, a non-magnetic-material interstage shielding, and the Takauchi part loss brass shaft,The film capacitor supplied from Germany, the large-sized carbon resistor, 70 micrometers of Copper-foil thickness substrate, the gilding shaving appearance pin jack, the very-thick cabtire AC code, etc. are adopted.

Rear
Internal Power
Using

Rating of a mode
Form Super balance circuit loading power amplifier
Effective output (20Hz - 20kHz) 300W+300W (4ohm)
245W+245W (6ohm)
200W+200W (8ohm)
Dynamic power (1kHz) 750W+750W (2ohm)
505W+505W (4ohm)
290W+290W (8ohm)
THD (at the time of an Output power 20Hz - 20kHz, 8ohm) 0.005%
Cross modulation distortion
(at the time of an Output power 70Hz : 7kHz = 4:1 or 8ohms)
0.005%
Power Band Width (IHF-3dB, THD 0.2%) 5Hz - 100kHz
A gain/phase 32dB / inphase
Frequency characteristic 1Hz-100kHz+0 -1.5 dB
Input sensitivity/impedance Balanced: 1V / 45kohm (Hot-Cold)
Unbalanced:1V/20kHz(Hot-Cold)
SN ratio (A-weighted and an input -- short) 124dB
Load impedance 4ohms or more
Dumping factor (8 ohm, 1kHz) 180
Meter range changeover (automatic) x1 (0dB=200W)
x0.01W-50W (0dB=20W)
Indicating range x1 range: 0.01W-500W
x0.1 range: 0.001W-50W
Indication precision 0±1dB-10±2dB-20±3dB
Supply voltage AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 550W
Dimensions Width 475x height 190x depth of 426mm
Weight 31.0kg