Marantz SC-7S1 - Manual (Page 6)

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3. Main features of this product
● 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 meaning of “Super Audio.”
This is why we have designed the input and output cir-
cuitry, volume control section, and power supply circuits
according to this philosophy.
The result: an astonishing channel separation of over
100dB at 20kHz.
● Fully balanced control amp with an linear
volume control
The SC-7S1 is a full balanced, two-channel control amp
providing the channel separation you need for Super
Audio. Based on our own high quality four-gang active
volume control we have developed an even better linear
control volume that reduces gang errors from 0 to 100dB,
±0.5dB. By adding an additional HDAM SA (High Defini-
tion Amplifier Module), 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.
● HDAM SA
The feedback impedance of the Current Feedback cir-
cuit 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 SAs on each input-
output buffer and another four units on the V/I converter.
● 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.
● Floating control bus system
We make it possible to synchronously drive two or more
control amps by using a floating control bus system con-
nected 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 ste-
reo performance can be accomplished 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 chan-
nel separation.