(27-11-2015 18:13)VasilTech писал(а): И, кстати, микросхема ЦАП в 550-ом используется всего одна, а не 4, как расписали на всевозможных сайтах.
вот тут вообще в точку.....не верь никому!
http://www.accuphase.com/cat/dp-550_e.pdf
MDS+ is a revolutionary approach that employs multiple delta-sigma type
D/A converters connected in parallel, for drastically improved performance.
The same digital signal is supplied to each converter, and the output of the
converters is summed before being sent to subsequent stages. The signal
components in the combined output are simply added up, thereby increasing
their level, but components that are due to conversion
errors may cancel each other out, causing
a reduction in level compared to simple summing.
This is turn increases the ratio of the target signal
to error components, resulting in a drastic improvement
in all relevant aspects of converter performance,
such as accuracy, S/N ratio, dynamic
range, linearity, and THD. (When the number of
converters is taken as "n", the improvement is √n.)
In the DP-550, four Hyperstream™ DACs (ES9008 from ESS Technology
Inc.) are used in parallel. Compared to a single converter, this results in an
overall performance improvement by a factor of 2 (= √4).
Because the performance improvement afforded by the MDS principle is
not dependent on signal frequency or signal level, noise at very low levels
that has plagued the output of conventional delta-sigma converters can also
be reliably reduced.
Features and Functions of Digital Processor Section
■ MDS+ type D/A converter with four DACs driven in parallel.
■ Digital level control allows adjustment down to -80 dB.
■ Separate transport and processor sections, with inputs and
outputs for HS-LINK, coaxial, optical, and USB (input only).
■ Sampling frequency indication
(kHz) during transport operation
and when using external input.
■ Triple layer bottom plate and carbon
cast iron insulator feet with superior damping characteristics
absorb vibrations for optimum sound quality.
■ Phase selector for balanced outputs.
■ Balanced and line analog outputs (1 set each).
■ High-grade SA-CD/CD drive.
q Highly rigid and precise construction with sturdy, heavyweight
chassis to absorb external vibrations.
w Traverse mechanism achieves floating design with newly developed
viscous dampers.
e Massive bridge cover.
r Non-resonant design and low center of gravity further reduce vibrations.
t High-quality disc tray extruded from an aluminum block, plus superquiet
and smooth disc loading
mechanism.
■ SA-CD/CD transport outputs
ultra pure digital signal.
■ Single lens/twin pickup high- speed access mechanism.
■ Accuphase’s proprietary
high-quality digital audio
interface HS-LINK (carries both
SA-CD and CD signal).
■ New chucking magnet design
using neodymium with high
flux density, together with 8- pole mag- netizing
yoke firmly
and evenly
grasps the
turntable
and pre- vents disc
wobble.
■ Support for DSD discs
recorded using DSF file format on a computer or similar.
Direct Balanced Filter With Separate Line/Balanced Circuitry
The analog filter designed to
remove so-called aliasing
noise in the very high frequency
range employs 5-pole
Butterworth analog filters
with extremely flat frequency
response in the passband. In
order to prevent unwanted interaction,
completely separate
low-pass filters are provided
for the line and balanced
signal paths.
