||850,000yen(December 1, 2002 release)
Stereo power amplifier which adopted the double
A balance amplifying circuit is
constituted by making every two of four push pull signal circuits into a pair, and it consists of original double differential-amplifier circuits which
re-unify an output by output auto FOMA of a final stage. Thereby, a signal
system realizes a completely symmetrical balance transmit from an input to an
output, and is reducing all the noises and distortion.
sorting of the output transistor element is carried out, and the linearity is
Output auto FOMA of mac tradition which is not concerned with
the impedance of a speaker but can maintain a fixed operation is carried.
Moreover, the counter-electromotive force from a speaker was absorbed by
this auto FOMA, and the distorted incrementation is prevented.
power guarding functionality is carried, the wave of an input and an output is
always compared and the difference exceeds 0.3%, gain will be lowered
automatically and distortion will be suppressed.
When the sentry monitor
is carried and the output current and a voltage are likely to exceed a default
value by output short-circuit or an unusually low load impedance, it lowers to
safe level automatically and an outage is prevented.
If the temperature
protection is carried and a sensor detects overheat, an input will be
intercepted, and if a temperature falls, it will return automatically.
The rush current at the time of power activation is restricted, and the
in rushes protection which eases the stress to a power circuit is carried.
A startup of amplifier is delayed for about 2 seconds at the time of
power activation, and the turn-on delay which protects a speaker from a
transient noise etc. is carried.
By DC protection, when a direct current
component begins to leak to an output, output auto FOMA makes a grounding bypass
and protects a speaker.
The power meter of MC402 measures not a simple
signal-voltage meter but a voltage and an electric-current value, and displays
the electrical-power value actually outputted to the speaker termination.
a WATTS position, the peek power window with a slow recovery functionality is
given, and in a HOLD position, it returns slowly, holding indicated value by the
maximum peak level.
Moreover, LIGHTS OFF serves as a position which is a
WATTS window and the back light switches off.
3 dimension design of 12mm
heavy glass and the illumination panel using light emitting diode / optical
diffusion fiber are adopted.
The stainless steel plate is adopted as a
chassis and it has become a natural air cooling system by a large-sized heat
The remote power control which can perform package on/off of a
power source from the control amplifier made from a mac is carried.
||Stereo power amplifier
||stereo: 400W+400W (2ohm, 4ohm, 8ohm)
mono parallel: 800W (1ohm, 2ohm, 4ohm)
||20Hz-20kHz+0 -0.25 dB
||A maximum of 0.005% (250mW - Output power)
|Cross modulation distortion
||A maximum of 0.005% (at the time of SMPTE
and an Output power)
||Unbalance: 1.9V / 10kohm (with VR)
Balance: 3.8V / 20kohm (with VR)
|SN ratio (A-criteria)
||Prevention from clipping, THD <=2% (less than
over-drive 14dB, 1kHz)
||AC100V, 50Hz/60 Hz, 12A (Underwriters
||Width 445x height 226x depth of 445mm