audio-video power amplifier which carries 2ch / 4ch change
Shortest-ization of the thorough signal path is attained
and the direct construction is carried.
In a direct construction, an input
signal goes into the main volume unit prepared in the shortest location
controlled by a brass long shaft from the part of a front direct, after passing
through the selector stored in the shielding case which took the measures
against a noise.
The signal by which level adjustment was carried out is led
to an amplification part in the shortest distance, and is straight outputted to
a speaker termination.
The circuitry layout considered so that unreasonableness might not start the fluence of this signal has realized shortest-ization of 80cm. And the using of the wire rod used as distortion of a signal or the factor of the tone-quality failure is made into the minimum.
In the power
amplifier part, in order to cancel the nonlinearity of a transistor, the
original super linear circuit of Pioneer is adopted.
This is pulling out the
property which is combining the nonlinearity which the transistor has with
another transistor which completely has a reverse property, is a flume detour
way technology which negates a mutual nonlinearity and suits, and was excellent
in the low distortion.
For this reason, it becomes possible to stop very slightly the amount of feedbacks in the whole amplification stage, and the number and capacity of a capacitor which have an ill effect on a tone quality are also decreasing.
In order that the noise electric current generated in a
power-source part or a large-current part may prevent degrading an input signal
by invading into a signal path, the clean grand system is adopted.
transformer and heat sink which were only being conventionally fixed to the
chassis were attached as a severe insulated structure, the contact into which a
noise invades was reduced as much as possible, and the path of an input signal
and the break-in path of a noise are separated.
Furthermore, the it1 setups
is carried out so that it may return to the power source which is a source of a
noise, and the ill effect by a noise electric current is low stopped by these
Various oscillations from the interior or the outside shake
the circuit board, and cause the instability of a circuitry, and in order to
prevent becoming a cause of a noise or a distorted occurrence, no vibrating and
an absent-resonance-ized design are put into practice.
A hybrid chassis with
a vinyl chloride sheet, the bottom plate which improved the periodic-damping
property greatly according to the sandwich construction of the heterogeneous
material of a steel plate, and a shielding case is begun,A variance and
absorption effect of an oscillation are high, and the firm high-rigidity
structure by the heat sink and honeycomb frame of the honeycomb form whose
intensity also improved simultaneously is built.
insulators which support a chassis frame directly are adopted.
By the same to each channel circuit-design and super linear circuit, direct
construction, and powerful power-source part, it is at the 2ch drives time,
and is at the 120W+120W and 4ch drives time, and the output of 70Wx4 (all
are 6ohm) is realized.
2ch / 4ch change functionality is carried, and, also in
two-line three inputs, and a speaker output, the inputs are two-line three
By an input selector, a functionality is possible as power amplifier of
2ch, 2chx2, and 4ch.
For the reason at the time of using
combining digital surround field processor SP-91D etc., the auto output selector
This has a functionality of a surround field control and a Dolby
prologic decode, for example in SP-91D, and placements of the speaker outputted
like a processing front speaker and a center speaker, respectively differ in
these two mode plays.
In an auto output selector, if the input mode to
reproduce is chosen, according to it, it will switch to a processing front
speaker or a center speaker automatically.
||audio-video power amplifier
|Output power (20Hz - 20kHz)
|Twoch drives :
||150W+150W (4 ohm, 0.02%)
120W+120W (6 ohm, 0.01%)
100W+100W (8 ohm, 0.009%)
|Fourch drives :
||75Wx4 (4 ohm, 0.04%)
70Wx4 (6 ohm, 0.03%)
55Wx4 (8 ohm, 0.02%)
|Dynamic power (EIAJ testing signal)
|THD (2ch drives)
||0.005% (20Hz - 20kHz, 50W, 8ohm)
||Amp1 and 2:1V/40kohm
||5Hz-150kHz+0 -3 dB
|SN ratio (A network, a short circuit)
||Twoch drives: 120dB
|Power consumption (Electrical Appliance and
Material Control Law)
||Width 420x height 163x depth of 424mm