Marantz SM-1151 manual Features, ¶HDAM-SA3, ¶Differential Input Voltage Amplifier, ¶Input Buffer

ENGLISH

FEATURES

	METER
DISPLAY	MODE
SPEAKERS	BALANCED
1
	STANDBY
SPEAKERS	UN-
2	BALANCED
	POWER ON/OFF

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.

¶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.

¶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.

¶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.

¶Input Buffer

Each input has its own input buffer that directly uses HDAM- SA3 technology to prevent interference between channels or input sources.

¶BALANCED/UNBALANCED Individual Gain Setting Function

The gain can be set individually for BALANCED input and UNBALANCED input according to the intended use.

¶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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