|330,000 yen(March, 2000 release)
Pure Class-A stereo power amplifier which inherited a design philosophy and
circuit technology, such as a constant-voltage drive of Accuphase, and reduction
in impedance, and adopted Power MOS FET as the output element.
to heat has adopted the power MOS FET of the negative characteristic as an
output magnification stage.
Three pairs are carrying out the parallel push
pull drive of this power MOS FET per channel, and the linear power which was
stabilized even as for super-low impedance load is guaranteed.
There is a
merit of being able to distribute the heat which the parallel connection can
make low the peculiar Output load impedance which an element has, and internal
noise, and is generated from an element. Furthermore, the small electric power
domain which was excellent in the linearity of MOS FET could be used
efficiently, and it has contributed to the engine performance and the
improvement in sound quality.
Moreover, in order to save the music signal of
the momentary pulse which sometimes appears from clipping, the maximum clipping
level is set as 50W at 8 ohms.
The actual measurement of clipping power is
the design which had 156W (it limits to a music signal) by 1 ohm of loads and
for which it had 126W and as sufficient by 85W and 8ohm at 4 ohms margin as 50W
The current feedback magnification circuit (current feedback
type magnification circuit) which returns an output signal in the form of
current is adopted.
A principle lowers the impedance of the input terminal
by the side of a return first, and detects current. I-V (current-voltage)
conversion of the current is carried out with a transformer impedance amplifier, and an output signal is made.
Since it is hard to generate phase rotation since the impedance of a return
input portion is low, and there is also almost no necessity for phase compensation,
many characteristics can be sharply improved by a little NFB, and a natural
energy response is possible.
Gain control of the amount change system of NFB is possible by the current
feedback magnification circuit which there is no disorder of the phase
by NFB, and is proud of the outstanding stability.
since a noise ingredient
will also fall simultaneously by this system if the gain of an amplifier is
lowered -- the crown of a high efficiency speaker or a multi-amplifier system --
power is demonstrated to reduction of the remains noises for regions etc.
The large-sized transformer of the efficient large power capacity of about
400 VA is adopted as a power-source part. This transformer is excellent
in heat conduction, is enclosed with a case using the high load material
of the vibrationproofing effect, and is intercepting the influence on the
Moreover, two large scale and high-quality sound types 47,000-micro F are
carried in the aluminum electrolytic capacitor for smooth. This capacitor is
insulated applying the heat contraction sleeve of wall thickness, and it has
structure which absorbs vibration.
By a changeover switch on the back,
bridge connection is possible.
Bridge connection inputs a negative phase signal into two polar different
amplifier, is a system which connects a speaker to the output end of both
amplifier, and can upgrade it to monophonic amplifier with this system.
Moreover, by the dual mono-position of a
changeover switch, a mono-output is used, the output for center Woofers is used,
or a 片 channel signal is outputted from both the speaker terminal, and it can be
used as an object for the by amplifier drive only for low-pass / high region.
The balance contact button which cannot receive visitor guidance noise
easily is carried.
The analog type large-sized power meter which can
carry out the Direct reading of the large power range by a logarithm compression
formula is carried.
Moreover, the switch which turns on and off operation
and lighting of meter is also equipped.
Copper is used for the parts
which a signal passes, and also plate-ization with gold is performed on this.
Improvement in the thorough sound qualities, such as a printed board
Copper-foil side, an input terminal, an output terminal, is aimed at.
is begun to delete brass Naked material, it is formed into a golden plate, and
the large-sized speaker terminal on which the mould cap of the insulated purpose
was put is carried on it.
||Stereo power amplifier
|Rated continuation average output
20Hz - 20kHz)
|At the time of stereo specification (both
channel simultaneous operation)
At the time of monophonic specification (bridge connection)
||At the time of stereo specification (both
channel simultaneous operation)
2ohms : 0.05%
4-16ohms : 0.02%
the time of monophonic specification (bridge connection)
4-16ohms : 0.02%
||At the time of a rated continuation average
output: 20Hz - 20,000Hz, and +0 -0.2 dB
At the time of 1W output: 0.5Hz -
160,000Hz, and +0 -3.0 dB
||28.0dB (at the time of GAIN switch MAX
o'clock, a stereo / monophonic specification)
||At the time of stereo specification:
At the time of monophonic specification: 4-16ohms
||At the time of stereo specification: 120
At the time of monophonic specification: 60
|Input sensitivity (8-ohm load)
||At the time of stereo specification
0.50V (at the time of a rated continuation average output)
0.11V (at the
time of 1W output)
At the time of monophonic specification
1.00V (at the
time of a rated continuation average output)
0.11V (at the time of 1W
|S/N (A compensation)
||110dB (at the time of input short-circuit
and a rated continuation average output)
|Power meter level
||A logarithm compression type, with a display
||At the time of no inputting: 160W
Electrical Appliance and Material Control Law: 250W
At the time of an
8ohm Output power: 180W
||Width 475x height 170x depth of 426mm