Marantz MA-9S1 - Manual (Page 6)

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3. Main features of this product
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The concept : Instantaneous current
delivery capability
Even if amplifiers have the same power specifications, their
performance may not be the same due to a difference in
current delivery capability.
The delivery capability of power amplifiers depends on how
instantaneous the current supply is.
That’s why the power supply for the MA-9S1 was completely
revamped to give it a truly instantaneous current supply ca-
pability that has been increased three times as much com-
pared to any Marantz product designed before.
●
Fully balanced monaural power amp
To minimize the influence of strong “return current” occurring
from the loudspeaker system, the circuit for the power amp
consists of two amplifiers giving a voltage gain amp of 23dB,
in a push-pull balanced construction, for the final buffer amp
of 6dB.
●
HDAM SA
The feedback impedance of the Current Feedback circuit was
reduced to its minimum to make it faster.
We developed a new High Definition Amplifier Module
(HDAM), a separated module operating as a buffer for
the amplifier.
●
Choke input system
The power supply of the voltage gain amplifier’s adopted
choke input system has few ripples and is durable with load
changes.
This can prevent noise from the amplifier as well as reduce
noise from the primary winding, resulting in a clean power
supply.
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Ultra low impedance amplifier
The buffer amplifier’s power supply block, which supports the
high current delivery capability, uses a capacitance input
system to realize very low impedance.
The Super Ring Power transformer, the low impedance elec-
trolytic capacitors, the very large gauge internal wiring, and
the thick pattern PCB all contribute in supplying the required
power.