||750,000yen(around the 1999 time)
Stereo power amplifier which sublimated further the
design concept cultivated by MC500, and raised completeness more.
MC352, the voltage and the linearity of current amplification are strictly
managed on each stage.
Therefore, it sorts out at a time 16 units of elements which are excellent
in a performance characteristic and have the stable electric-current gain
to an output transistor, and they are used for it, respectively. The linearity
of the impedance is raised applying a feedback to two balance stages in
front of an amplification stage so that the load impedance of each amplification
stage may become others fixed according to the level of an input signal.
Moreover, the capacitor and the high precision
part with little variation to a resistor were adopted, and the linearity at the
time of the Koide power is also improved by reducing crossover distortion by an
automatic tracking bias system.
Since the output transformer is adopted
and the optimal impedance matching becomes possible to the load intensity of any
speakers, an operation in a best condition is always possible for an output
Moreover, a dynamic behavior and sense of stability are improved
by adopting the first balance coil in a mac MC352.
The capacity of the
transformer of a power-source part and a size up of a filter capacitor are
performed, and the supply capacity and the SN ratio of the power source are
The rigid high stainless steel chassis is adopted as a chassis, a power transformer is arranged in the center, and it has become the mono-block
construction which reduced the crosstalk with arranging output auto FOMA right
Moreover, the power transistor is attached to the high heat sink
of the cooling effect called the surface area of 2,800 square inches, and does
not need the cooling fan.
The original power guarding system is carried.
If a power guarding indicator lights up and also distortion increases when
an output signal wave is compared with an input signal and the height harmonic
distortion by an over drive exceeds 0.3%, a power guarding circuitry will work
and an input signal will be controlled.
Moreover, in MC352, since output
auto FOMA is adopted, the damage to the speaker by direct current is not
generated theoretically. Furthermore, even if a speaker short-circuits or it
becomes a super-low-impedance load intensity, the sentry monitor circuitry
operates and a power stage is guarded.
A mac and blue large-scale-with
illumination peaking capacity window meter are carried.
off-position is also carried in this meter.
The speaker termination in
which the gilding treatment was performed is adopted.
perception of overheat carries the temperature protection which carries out the
mute of the input.
The latency turn-off circuitry which reduces the
shocking noise at the time of power activation is carried.
It can be used also as monophonic amplifier of 700W by parallel connection.
||Stereo power amplifier
(20Hz - 20kHz, sine wave)
|stereo: 350W+350W (2ohm, 4ohm, an 8-ohm load
intensity, the succession minimum mean-value power output value)
parallel: 700W (1ohm, 2ohm, a 4-ohm load intensity, the succession minimum
mean-value power output value)
||20Hz - 20kHz
|Output load impedance
||stereo: 2 ohms, 4ohm, 8ohm
mono: 1 ohm,
||20Hz-20kHz+0 -0.25 dB
||0.005% or less (250mW - an Output power,
20Hz - 20kHz, both ch(es) drive)
|Cross modulation distortion
(SMPTE, both channel drive)
|0.005% (instant peek power output <=
Output-power x2, 20Hz - 20kHz)
|SN ratio (A-Weighted)
||Unbalance: 85dB (116dB and below an Output
Balance: 115dB (124dB and below an Output power)
||40 or more
||Prevention from clipping
(less than over-drive 14dB, 1kHz)
||AC100V, 50Hz/60 Hz, 14.4A (Underwriters
||Width 445x height 240x depth of 495mm (a
knob, a terminal included)