The Integrated Amplifier to which improvement corresponding to a next-generation
audio was performed based on PMA-1500R.
The power amplifier circuit etc.
was improved and the maximum of the frequency response at the time of real use
is improved to 100kHz.
Furthermore, by using low impedance volume, the noise
generated within amplifier at the time of real use is reduced, and resolving
power is raised.
Since high-quality-sound-izing and speaker drive
capability are compatible with the magnification element of the minimum unit,
large current type magnification element UHC-MOS has been adopted as a
magnification element. Power of expression and high power are reconciled by the
single push pull circuit using UHC-MOS.
The twin transformer parallel
connection which improves the characteristic of a magnetic circuit and each
winding wire sharply is adopted.
Moreover, by making influence of magnetic
etc. into the L.C. (Leakage Cancelling) mount system canceled mutually, the
leakage flux of the power transformer which is a noise source in amplifier was
reduced, and improvement in current supply capability and low-noise-ization are
The Schottky barrier diode adopted by PMA-2000III etc. is
adopted as a rectifier circuit. The sound quality which stopped the noise more
has been obtained by the low-noise characteristic and the large current
characteristic by high-speed operation.
The independent composition of a
power amplifier block is begun and sound quality degradation by the mutual
intervention between circuits or inflow of a noise is suppressed by making it
the block structure which also separated the circuit where other signal levels
Moreover, the influence on the sound quality by the interference during
each block, such as adding a radiator stabilizer to the power amplifier
part radiator which is easy to be influenced by vibration, is eliminated.
since a chassis examines and adopts the thickness of the sheet steel and also
puts deterrence of vibration into practice, it is made into the transformer base
sheet steel and the combination of special resin.
In order to stop the
power consumption by the standby at the time of remote power-off, the power
transformer for exclusive use is carried in each of a microcomputer circuit and
an audio circuit. This has eliminated not only reduction of the power
consumption at the time of standby but the interference with the microcomputer
to an audio circuit.
While hearing it, when a microcomputer does not control, the microcomputer stop mode which stops all the operation of a microcomputer automatically is carried. While this is usually hearing it, the clock oscillation of the microcomputer stopped and inflow of the noise to an audio system is canceled.
appearance of the speaker terminal is carried out, it plates with gold at a
part, and is reducing the transmission loss. Moreover, the large-sized speaker
cable is also supported by setting the bore diameter of a clamp part to phi6mm.
Furthermore, bi-wiring connection is possible for two speaker terminals.
The phone equalizer part has composition which adopted low-noise FET as
the first rank circuit of discrete composition.
Moreover, the cartridge of
each MM/MC is supported by switch change.
The pre-out terminal is
Parts, such as a gilding terminal, high-quality sound carbon
resistance, a capacitor, are adopted.
Moreover, the attachment-and-detachment type is adopted as a power cord.
control is attached and CD of DENON, MD, the cassette deck, and the tuner are also supported.
Moreover, the independent power transformer is adopted as
controlling-circuit power sources, such as remote control, and the interference
to an audio circuit is reduced.
|<Power amplifier part>
|Output power (both channel drive, CD->SP out)
||70W+70W (8 ohms, 20Hz - 20kHz, THD 0.07%)
140W+140W (4 ohms, 1kHz, THD 0.7%)
||0.01% (Output-power-3dB o'clock, 1kHz,
|Speaker output terminal
||Speaker AorB: 4ohms - 16ohms
Bi-wiring load: 4ohms - 16ohms
||Phono MM: 2.5mV/47kohm
Line: 150mV/47kohm (Source-Direct-off)
||Equalizer amplifier output: 150mV
||5Hz-100kHz+0 -3 dB
|Signal to noise ratio (the auditory
sensation weighting A, input short circuit)
||Phono MM: 91dB (at the time of a 5mV input)
Phono MC: 76dB (at the time of a 0.5mV input)
||Bass: }8dB (100Hz)
Treble: }8dB (10kHz)
||switched: Three lines, the sum total
|Power supply voltage
At the time of standby:
|Dimensions (a base, a knob, a terminal
||Width 434x height 134x depth of 407mm
||System remote control