Main Feature Of Product - Marantz SC-7S1 User Manual

3. Main feature of product

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The concept: channel separation for super
wide range & dynamic audio
We think it's of the utmost importance to extend high frequency
response as well as channel separation so you can hear the
true meating of "Super Audio."
This is why we have designed the input and output circuitry,
volume control section, and power supply circuits according
to this philosophy.
The result: an astonishing channel separation of over 100dB
at 20kHz.
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Fully balanced control amp with an linear
volume control
The SC-7S1 is a full balanced, two-channel control amp pro-
viding the channel separation you need for Super Audio.
Based on our own high quality four-gang active volume con-
trol we have developed an even better linear control volume
that reduces gang errors from 0 to 100dB, ±0.5dB. By add-
ing an additional HDAM SA (High Definition Amplifier Mod-
ule), we improved the Common Mode Reject Ratio (CMRR)
dramatically, attaining an incredible ultra-wide frequency band
of 150kHz and succeeded in producing the perfect control
amplifier for Super Audio CD.
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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 Modules (HDAM), a separeted
module operating as a buffer for the amplifier. The SC-7S1
has four HDAM SA on each input-output buffer and another
four units on the V/I converter.
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Choke input system
In the power supply section, the choke input topology was
adopted to drastically reduce rectifier harmonic noise. This
system is especially suitable for a control amplifier in which
very small signal amplification occurs.
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Floating control bus system
We make it possible to synchronously drive two or more con-
trol amps by using a floating control bus system connected
to as many as 6 sets of control amplifiers. We also enable you
to trim levels using the remote control, making it easy to set
up the optimal sound field on a multi-channel configuration.
The highest achievable stereo performance can be accom-
plished when a system configured with two sets of SC-7S1
and four sets of MA-9S1 are connected in a bi-amped mode.
You will experience superb sound with unbelievable channel
separation.
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