Marantz SM-1151 - Manual (Page 8)

2
ENGLISH
This unit was developed with many of the same functions as
the flagship model MA-9S2 and with a 2-channel function,
without compromising the sound quality.
¶
HDAM-SA3
The HDAM-SA3 is an amp module equipped with a new circuit
that has further improved stability from the previous HDAM-SA
and HDAM-SA2.
The HDAM-SA3 is an essential part of this unit’s amp module,
incorporated into many components such as the voltage-
current converter and input buffer.
¶
Dual Structure Voltage Amplifier
+ Power Buffer Amplifier
Speakers with powerful magnetic circuits have large back
electromotive force, and are therefore not easy to drive.
Therefore, in the same way as the MA-9S2, this unit was
developed with the dual structure of a voltage amplifier and
power buffer amplifier so that there is no influence from the
back electromagnetic force.
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Differential Input Voltage Amplifier
The current feedback voltage amplifier that is equipped with
the newly developed HDAM-SA3 and features differential
input amplifies the voltage of the balanced input signals and
unbalanced input signals.
Furthermore, it can also be switched between gain conversion
or stereo mode to BTL monaural mode.
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New Current Feedback Power Buffer Amplifier
The power buffer amplifier that powerfully drives the speakers
incorporates a voltage-current conversion circuit that contains
a newly developed Complimentary Cascade Push-pull Circuit,
which greatly increases stability.
Furthermore, the combination of the Wilson current mirror
circuit and Cascade bootstrap circuit in the current amplification
circuit provides power amplification with low distortion in the
super-high frequency.
DISPLAY DISPLAY
POWER ON/OFF POWER ON/OFF
METER METER MODE MODE
BALANCED BALANCED
UN- UN- BALANCED BALANCED
SPEAKERS SPEAKERS 1
SPEAKERS SPEAKERS 2
STANDBY STANDBY
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Improved Instantaneous Current Delivery
Capacity
The final stage of the power buffer amp has a LAPT special
power transistor parallel push-pull construction to improve
delivery, and the block capacitor and power buffer amplifier
are unified.
Also, the block capacitor and unified power buffer enable the
reduction of the current loop path, creating superior channel
separation.
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Input Buffer
Each input has its own input buffer that directly uses HDAM-
SA3 technology to prevent interference between channels or
input sources.
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BALANCED/UNBALANCED Individual Gain
Setting Function
The gain can be set individually for BALANCED input and
UNBALANCED input according to the intended use.
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Digital Power Meter
The actual output power can be indicated on the display by
detecting the speaker output voltage and output current.
Considering overall sound quality, a PLD (programmable logic
device) is used instead of DSP for the digital processing to
minimize the amount of digital noise.
¶
Remote Power Control
The Power to this unit can be switched ON/OFF in sync with
the Marantz SC-11S1 stereo control amplifier ON/OFF control
using the remote power control function.
The connection with the SC-11S1 is made without a ground
loop being formed, therefore sound quality is not adversely
affected.
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