|ONKYO Integra M-588
|300,000yen(around the 1992 time)
Stereo power amplifier which adopted the super
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
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.
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.
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.
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
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.
||Super balance circuit loading power
|Effective output (20Hz - 20kHz)
|Dynamic power (1kHz)
|THD (at the time of an Output power 20Hz - 20kHz, 8ohm)
|Cross modulation distortion
(at the time of an Output power 70Hz : 7kHz = 4:1 or 8ohms)
|Power Band Width (IHF-3dB, THD 0.2%)
||5Hz - 100kHz
||32dB / inphase
||1Hz-100kHz+0 -1.5 dB
||Balanced: 1V / 45kohm (Hot-Cold)
|SN ratio (A-weighted and an input -- short)
||4ohms or more
|Dumping factor (8 ohm, 1kHz)
|Meter range changeover (automatic)
||x1 range: 0.01W-500W
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 475x height 190x depth of 426mm