Marantz MA-9S1 650,000yen(October, 2002 release)

　
It is the monophonic power amplifier which improved thoroughly the power amplifier circuitry, and a power source and a feed line, and realized the conventional about 3 time (150A SM-5 ratio) thing momentary-current supply capacity.

In order to suppress the influence from counter-electromotive force to the minimum, the amplifying circuit is considered as 2 amplifier stream compositions of voltage amplifier (voltage amplifying circuit) 23dB of 3 parallel push pull full balance stream composition, and power buffer amplifier (power amplification circuitry) 6dB.

The ripple component of a rectification wave has adopted very little choke input scheme strong also against a load variation as the power circuit for voltage amplifier. Thereby, since there is also little power-source higher harmonic, the noise to the off-site audio equipment through a primary side can be reduced.
The noise which invades from a primary side is also reduced. And the clean power source can be conjointly supplied to the small signal circuitry with "schottky diode / noise-killer element."

The impedance has adopted as the power-source part for power buffer amplifier the capacitor input scheme which makes large-current supply capacity elated low. The large-current supplying is enabled by the super-low-impedance block capacitor, very-thick distribution cable, and thick foil substrate which were developed to the super ring large-sized toroidal transformer or the special purpose.

In order to aim at a feedback-impedance reduction of a current feedback circuit and to realize further high speed-ization, the separate module HDAM SA for buffer amplifier to which HDAM of Marantz original was evolved further is newly developed, and it carries in MA-9S1.
In MA-9S1, it carries in the power buffer amplifier part at two pieces and four voltage amplifier parts.

The center power meter is carried.

A six-step Attenuator is carried.

It begins to delete to an imbalanced input terminal, and the gilding terminal is used.
Moreover, the speaker terminal by German WBT is carried in the speaker termination corresponding to bi-wiring.

About 7.0kg large-sized aluminum extrusion heat sink is adopted.

The copper plating double layered bottom chassis of thickness "3.2mmx2" is adopted. 

Form	Monophonic power amplifier
Output power (20Hz - 20kHz)	600W (4ohm) 300W (8ohm)
THD (20Hz - 20kHz, 8ohm)	0.01%
Output bandwidth (an 8-ohm load intensity, 0.05%)	5Hz - 55kHz
Frequency characteristic (1W or 8-ohm load intensity)	3Hz-120kHz+0 -3 dB
Dumping factor (8 ohm, 20Hz - 20kHz)	200
Input sensitivity/impedance	Balanced: 1.7V/20kohm Unbalanced: 1.7V/20kohm
S/N (IHF-A network)	Balanced:120dB Unbalanced:120dB
Voltage amplification	Balanced:29dB Unbalanced:29dB
ATT set point	0, -3, -6, -9, -12, -infinitydecibel
Supply voltage	AC100V, 50Hz/60Hz
Power consumption	450W (Electrical Appliance and Material Safety Law) 1200W (at the time of a 4-ohm Output power)
The maximum Dimensions	Width 459x height 198x depth of 451mm
Weight	35.8kg
Adjunct	AC cable

Posted in: Marantz, Marantz-Amplifier, Marantz-Amplifier-Separate, Marantz-Amplifier-Separate-Monophonic