Marantz Reference Series PM-15S1 - Manual (Page 6)

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ENGLISH
Marantz has surpassed itself with the new PM-15S1 stereo
integrated amplifier, which incorporates many of the design
concepts of the PM-11S1 flagship model amplifier.
Amplifier
• HDAM     
SA2
As in the PM-11S1 model, the PM-15S1 also incorporates the
HDAM
 SA2 as the main amp module. The HDAM  SA2 in-
cludes an input buffer, linear control volume and power buffer.
• Linear Control Volume
PM-15S1 inherits the Linear Control Volume system used in
the PM-11S1, which offers smooth volume control of
±0.5dB
steps in a range of 0dB - 100dB.
• Current Feedback Phono Equalizer
The Phono Equalizer, which has MM/MC type cartridge sup-
port, also inherits the Current Feedback Phono Equalizer used
in PM-11S1.
• Input Buffer
The input buffer is composed of the HDAM  SA2 in the input
section, which enables signals from the input source to be
transmitted precisely to the linear control volume.
• Power Amplifier
Following closely in the footsteps of its predecessor, the PM-
11S1 is designed using a two-amplifier construction. By using
a two-amplifier system, the power buffer uses high power to
drive the speakers, therefore cutting the effects of Back EMF
from the speakers.
FEATURES
Power
• Power Transformers
Newly developed Toroidal power transformers are used in the
PM-15S1 because they produce less vibration and magnetic
leak than ordinary laminate design transformers. Vibration re-
duction is achieved by using ring shaped core materials, while
rigorous controls are maintained on the manufacturing pro-
cess. Furthermore, the transformer periphery is covered with
a ring core and short ring to reduce magnetic flux leak.
• LC Ripple Filter
An LC Ripple Filter has been incorporated into the pre-amp
power circuit, which provides “clean” power to the pre-amp
section. “Clean” power is achieved by cutting out rectifier noise
generated by the rectifier circuit, as well as external high fre-
quency noise.
Functions
• Bi-Amp Mode
The complete bi-amp connection proposed by Marantz with
the SC-7S1 and MA-9S1 reproduces a sound environment
never before experienced. This same bi-amp connection has
been made possible with the PM-15S1. Two PM-15S1s are
connected by F.C.B.S. in a bi-amp mode that enables each to
work as a monaural integrated amplifier.
• Floating Control Bus System
A Floating Control Bus System (FCBS) enables the user to
connect up to four PM-15S1s, making possible a diversity of
applications with complete bi-amp and multiple channel
connections.(pg. 6, 7) Moreover, a ground loop is not formed
between multiple connected PM-15S1s, therefore sound qual-
ity is not adversely affected.
• Display
The PM-15S1 adopts an LCD to display input source and vol-
ume level. Compared to other types of display panels, an LCD
generates less drive noise and radiated noise, hence the ef-
fect on sound quality is minimal.