Dual drive amplifier which gazed at it and developed the DVD-Audio age as a compilation of the direct energy MOS FET which Pioneer has cultivated.
The speaker drive scheme in the 3 mode can be chosen by power amplifier
loading of a total of four channels.
At a separate mode, it operates as
four-channel independent power amplifier, and the cross interferencee of a
speaker inter-unit is eliminated by bi-wiring interconnection by a dual mode.
Moreover, in bridge mode, it operates as two-channel high power amplifier by
The direct energy MOS FET of the Pioneer original
development is carried.
The direct energy MOS FET has very few energy
losses, and has the distinctive characteristics excellent in a power linearity
and low load-intensity drive capacity. This power element was
large-capacity-ized further, and the operating error between channels is put
into practice and eliminated by adopting as all the channels only the sorting
article which it kept choosing further from high qualities.
adopting the very small ceramic sheet of thermal resistance as the insulating
material of a large-sized heat sink and MOS FET, the temperature rise over an
interconnection signal input and the momentary temperature rise over a pulse
nature input are minimized, and the speed of the retroaction at the time of the amount input of Oto and the transparency of sound are improved.
newly developed Z bias circuit that controls the temperature coefficient of MOS
FET was carried in the temperature compensation of the idle current, the drift
of an idle current has been improved sharply, and the tone quality stabilized
from immediately after the power source on is realized.
linear circuit which can obtain gain required of a current feedback type
one-step amplifying circuit was brushed up further, and the perfect discrete
stream composition not using DC servo or operational amplifier is realized. The
clear low-pass play is enabled by keeping NFB constant from super-low-pass one.
The Digital Accurate Control attenuator in a digital analog converter
which overly controls a sound volume with high precision using a precision
resistance element is carried in the volume. By two input switchings and a DAC
attenuator functionality, the direct input from a compact disk player etc. is
A DAC attenuator does not have aggravation of the SN ratio by the interlocking
error or attenuator location between right-and-left channels, or a separation.
Moreover, the ill effect by oscillation can be reduced.
Moreover, for the reason in the case of
using it, connecting with a preamplifier, an attenuator through functionality
can be used.
The newly developed low-impedance electric-field capacitor
and the very-thick wire were used abundantly on the power source and the grand
line, the Ultra Low Inpedance power circuit which put low-impedance-ization into
practice is adopted, and the supply capacity of a momentary large current is
The right-and-left independent twin stereo stream composition
is adopted from a power source to the input/output terminal of a rear panel.
Furthermore, a signal path is formed into the simple & shortest, by
carrying out the isolated rate of each block with a shielding case, the
thorough analysis of the potential difference in a chassis, the magnetic
field in a set, a temperature, the oscillation, etc. is conducted, and
the environment is homogenized.
The newly developed aluminum extrusion material of the wall
thickness type which achieved the right-and-left independency is adopted as a
Three brass stays which made brass Naked material this and it
took are combined with a hybrid, and it has become a construction holding heavy
loads, such as a power transformer, an electric-field capacitor, and a heat
sink. This is improving the rigidity of the component.
In order to
protect an input/output terminal from the sound pressure of a speaker, the 2mm
thickness steel plate which gave the copper plating is adopted as a rear
stabilizer. Furthermore, brass Naked material is adopted also as an insulator
and the oscillation is controlled.
Conductivity was raised to the
chassis, the rear panel, the shielding case, etc., and the high conduction
chassis by the copper plating steel plate which stops a RF noise is adopted.
Moreover, he chooses even one one-point part carefully, and is examining the
tone quality by set package.
The hypermarket ring toroidal transformer
of 355VA is carried in a power-source part, and low load-intensity drive
capacity is improved.
Moreover, in the mass toroidal transformer, the
power-source higher-harmonic regulation made difficult is cleared.
||Dual drive amplifier
|Output power (all the channel drives)
||230Wx2/220Wx2 (1kHz/20 Hz - 20kHz, 0.15%, 6
200Wx2/190Wx2 (1kHz/20 Hz - 20kHz, 0.09%, 8 ohms, Bridge)
115Wx4/110Wx4 (1kHz/20 Hz - 20kHz, 0.15%, 3 ohms, Dual/Separate)
100Wx4/90Wx4 (1kHz/20 Hz - 20kHz, 0.09%, 4 ohms, Dual/Separate)
65Wx4/60Wx4 (1kHz/20 Hz - 20kHz, 0.08%, 8 ohms, Dual/Separate)
||0.08% (20Hz - 20kHz, 100W, 8ohm, Bridge)
0.06% (20Hz - 20kHz, 30W, 8ohm, Dual/Separate)
||5Hz-150kHz+0 -3 dB
||125dB (Attenuator through on )
||115dB (20Hz - 20kHz, Dual/Separate)
104dB (20Hz - 20kHz, Bridge)
300 (20Hz - 20kHz)
||Input1 and 2:1V/47kohm
||Width 440x height 178x depth of 420mm