Audio Database

The

McIntosh MC352 750,000yen(around the 1999 time)

Description
 
Stereo power amplifier which sublimated further the design concept cultivated by MC500, and raised completeness more.

In 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 transistor.
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 raised.

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 and left.
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.
The illumination off-position is also carried in this meter.

The speaker termination in which the gilding treatment was performed is adopted.

A sensor's 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.

Rear
Upper

Rating of a mode
Form Stereo power amplifier
Output power
(20Hz - 20kHz, sine wave)
stereo: 350W+350W (2ohm, 4ohm, an 8-ohm load intensity, the succession minimum mean-value power output value)
mono parallel: 700W (1ohm, 2ohm, a 4-ohm load intensity, the succession minimum mean-value power output value)
Output-power bandwidth 20Hz - 20kHz
Output load impedance stereo: 2 ohms, 4ohm, 8ohm
mono: 1 ohm, 2ohm, 4ohm
Input sensitivity/impedance 2.2V/10kohm
Frequency characteristic 20Hz-20kHz+0 -0.25 dB
10Hz-100kHz+0 -3 dB
THD 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 power)
Balance: 115dB (124dB and below an Output power)
Sensitivity Unbalance: 1.9V
Balance: 3.8V
Input impedance Unbalance: 20kohm
Balance: 40kohm
Dumping factor 40 or more
Power guarding Prevention from clipping
THD <=2% (less than over-drive 14dB, 1kHz)
Power source AC100V, 50Hz/60 Hz, 14.4A (Underwriters Laboratories/CSA specification)
Dimensions Width 445x height 240x depth of 495mm (a knob, a terminal included)
Weight 47.63kg