|1,000,000 yen(one set, the December, 1997 release)
Monophonic power amplifier developed aiming at the constant-voltage drive of an
The high power transistor of the collector loss 130W and
collector current 15A is adopted. This was constituted from a 22-parallel push
pull, and super-low impedance-ization is measured. And these elements are attached on the huge heat sink by aluminum die-casting, and efficient heat
dissipation processing is carried out.
The power excellent also in the load
drive capability to have realized the Oide power power amplifier even with
linear super-low impedance load, and for the reactance component to have been
includeded is demonstrated as a result of this degree of margin.
current feedback type magnification circuit which returns an output signal in
the form of current is adopted.
First, the impedance of the input terminal
by the side of a return is lowered, and current is detected. I-V
(current-voltage) conversion of the current is carried out with a transformer
impedance amplifier, and an output signal is made.
Since the impedance of a
return input portion is very low, it is hard to generate phase rotation and, as
a result, most phase compensation is not needed.
Thereby, since many characteristics are sharply improvable by a little
NFB, it excelled in dynamic characteristics, such as a standup, and the
natural energy response has been obtained also in respect of sound quality.
By bridge connection
which uses two sets of M-2000, an output can be reinforced 4 times.
connection inputs the signal of an inversion phase mutually on the same voltage, and connects a speaker to two sets of amplifier at the output end of both
in the time of bridge connection, 4 times as many outputs can be
obtained and it is 1000W/8 ohm -- super- -- a crossbow -- it becomes class
The balance contact button which cannot receive
visitor guidance noise easily is carried.
The parts which a signal
passes are performing plate-ization with gold on this in M-2000, although copper
with usually high purity is used.
Improvement in the thorough sound
qualities, such as a grounded plate, a capacitor terminal, an input terminal, a
speaker terminal, etc. in which a printed board Copper-foil side and big ripple
current flow, is aimed at.
The hypermarket ring type toroidal transformer of the large power capacity
of about 1.5 kVA is adopted as a power-source part.
This transformer is excellent in heat conduction, using
the high load material of the vibrationproofing effect, adheres to the
unresonated aluminum case of efficient heat dissipation structure, and is
intercepting the influence on the exterior.
Furthermore, the section of the
iron core was close to the circle, the coil could also be rolled closely
circularly, and since adhesion nature is good, the loss has made weight light
few. The leakage flux at the time of load is also small, and a roar and
vibration are also small. Moreover, iron loss and in rushes current are made
small by enlarging the rate of a bulk density of copper wire for the
cross-sectional area of an iron core small.
Moreover, two large-sized things
of 40,000 micro F / 120WV are adopted as an electrolytic condenser.
phase switch which reverses the phase of the whole equipment is carried.
Since the method of changing only replaces plus and minus of the balance amplifier input unit, it does not have degradation of sound quality.
logarithm compression type large-sized power meter is carried.
meter operation and lighting is possible.
It can respond also to a very thick speaker cable -- the large-sized speaker
terminal is overly carried.
begun to delete brass Naked material, and a material forms it into a golden
plate, and has put the mould cap of the insulated purpose on it.
||Monophonic power amplifier
|Rated continuation average output
20Hz - 20kHz)
|1ohm load: 2000W (it restricts to a music
2ohm load: 1000W
4ohm load: 500W
8ohm load: 250W
||1ohm load: 0.1%
2ohm load: 0.05%
4ohms - 16ohm load: 0.03%
||At the time of a rated continuation average
output: 20Hz-20000Hz+0 -0.2 dB
At the time of 1W output: 0.5Hz-160000Hz+0
||At the time of a continuation output: 2ohms
At the time of a music signal: 1ohm - 16ohms
|Input sensitivity (8-ohm load)
||At the time of a rated continuation average
At the time of 1W output: 0.11V
||120dB (at the time of input short-circuit
and a rated continuation average output)
|Power output meter
||Logarithm compression type
- 60dB -
+3dB, and an output Direct-reading scale
||At the time of no inputting: 180W
Electrical Appliance and Material Control Law: 950W
At the time of an
8ohm Output power: 585W
||Width 475x height 252x depth of 545mm