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| DENON PMA-2000IV |
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| 120,000yen(March, 2002 release) |
The Integrated Amplifier which improvement was performed and was born as the 4th
generation of the PMA-2000 series.
UHC(Ultra High Current)-MOS is
adopted as an output element. This element has 3 to 10 times [ usual ] as many
current supply capacity with the magnification element of the minimum unit, and
coexistence of power of expression and high power is aimed at with constituting
from a single push pull circuit.
The High Current Dynamic power supply
circuit which adopted the newly developed block capacitor for audios is adopted
as a power-source part. Current supply stabilized over all the zones is enabled
for rectification with the large current type Schottky barrier diode or the
newly developed block type electrolytic condenser.
A power transformer
improves electricity and a magnetic property sharply by carrying out parallel
connection of the two transformers, and is reducing the leakage flux which is
adopting the L.C. (Leakage Canceling) mount system which cancels the influence
of mutual magnetism, and is a noise source in amplifier.
Moreover, the means
of attachment of the transformer also heightened the floating effect combining
special resin, a rubber cushion, etc., and have eliminated the influence on
sound quality.
In order to aim at correspondence to a next-generation
audio, each of a volume circuit, a tone circuit, and a power amplifier circuit
is improved, and the maximum of the play frequency at the time of real use is
100kHz.
The pre-out terminal and the power direct input terminal are
carried.
The power direct input terminal can choose power direct with the selector
of the front panel, if the switch of the back panel is changed. By other
positions, it operates as an Integrated Amplifier.
The input change to
power amplifier is using the relay selected carefully, and is attaining
high-quality sound-ization, such as also outputting a pre-out terminal from the
discrete composition flat amplifier of a MOS-FET output used by PRA-S1.
In order to reduce the noise which flows into the grand circuit used as
the standard of signal magnification and to attain stabilization of grand
electric potential, the Precision Signal Ground circuit is carried.
In order to suppress the mutual intervention of each circuit, and inflow
of a noise, a power amplifier block is considered as the twin monophonic
composition allotted symmetrically, and also cover is put into practice
according to a signal level, and it is considered as the 6-block Separated
structure which uses the 1.6-mm-thick black processing sheet steel.
Precision Mechanical
Ground structure is adopted and interference with other sources of vibration,
such as a power transformer, is suppressed by carrying out direct attachment of
the radiator dumped by the gum elastic and the radiator stabilizer at the
nearness of FOOT. Moreover, top covering and the volume knob which took the
measures against vibrationproofing are adopted.
A phone equalizer part
is having adopted the equalizer of discrete composition of having adopted
low-noise FET as the first rank, and also stabilizing according to an exclusive
power source, and is attaining high-quality sound-ization.
MC cartridge is
also supported by the switch change of a back panel.
Parts, such as a
power radiator excellent in OFC internal wiring material, an inactive gas
enclosure relay and high-quality sound carbon resistance, or the heat
dissipation effect, are adopted.
the large-sized speaker terminal which
carried out brass shaving appearance and plated with gold at the part is
adopted. The bore diameter of a clamp part also supports the very-thick speaker
cord by being referred to as phi6mm.
Moreover, two speaker outputs are
prepared and bi-wiring connection is possible.
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| Form |
Integrated Amplifier |
| <Power amplifier part>
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Output power
(Both channel drive, CD->SP out) |
80W+80W (8 ohms, 20Hz - 20kHz, THD 0.07%)
160W+160W (4 ohms, 1kHz, THD 0.7%) |
| Input sensitivity/impedance |
Power amp direct: 0.9V/47kohm
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| Speaker output terminal |
Speaker AorB: 4ohms - 16ohms
Speaker
A+B: 8ohm-16ohm |
| <Preamplifier part>
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| Input sensitivity/impedance |
Phono MM: 2.5mV/47kohm
Phono MC:
0.2mV/100 ohms
Line: 135mV/47kohm (Source-Direct-off)
135mV/13kohm
(Source-Direct-on) |
| RIAA deflection |
20Hz-20kHz±0.5dB |
| Output power |
Equalizer amplifier output (Rec out): 150mV
Pre out: 0.9V (135mV of Line input o'clock) |
| <Synthesis>
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| Frequency response |
5Hz - -100kHz three dB |
| THD |
0.01% (CD->SP out, Output-power-3dB, 8
ohms, 1kHz) |
Signal to noise ratio (A network)
Input
short circuit |
Phono MM: 90dB (at the time of a 5mV input)
Phono MC: 73dB (at the time of a 0.5mV input)
Line:108dB
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| Tone control |
Bass: ±8dB (100Hz)
Treble: ±8dB (10kHz)
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| Power receptacle |
switched: Two lines, a total of 120W
unswitched: One line, 240W |
| Power supply voltage |
AC100V, 50Hz/60Hz |
| Power consumption |
275W |
| Dimensions |
Width 434x height 180x depth of 478mm
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| Weight |
23.5kg |
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