Accuphase marks its 50th anniversary with the DP/DC1000, that is 5th generation separate SACD/CD playbacksystem.
In 2000, Accuphase launched the DP/DC-100 as the 1stSACD separate system, it’s gone down in history with its
overwhelming sound quality and electrical performance.
The new DP/DC-1000 is the superior SACD/CD player thatwill bear the next generation with an array of the latest
technologies renewed from the DP/DC-950 in 2016.
With the significant revision of circuit configurations andPCB arrangement, the DC-1000 achieved immense stride
in advance for both electrical performance and soundquality.
The DC-1000 provides the provocative experience derived
from the spectacular music playback.
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DC-1000 cab show the sampling frequency and thenumber of effective bits of input signals on front panel
display.
Sampling frequency and the number of effective bits are
actually measured internally, not simply showing the data
which is attached with the signals.
While the former DC-950 shows the sampling frequencyof DSD signals in “kHz”, the DC-1000 displays in “MHz”
with a smaller number of digits.

2The DC-1000 has symmetrical layout same as the former
DC-950, but the number of components are greatlyincreased, it also contributes to the DC-1000’s advancedevolution.

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For D/A Converter section, Accuphase adopts the ESS
Technology’s 32bit Hyperstream DAC ES9038PRO.
Each channel uses 1 DAC chip which incorporates 8converters, and has them drive in parallel.
These DACs are essential for our original circuits,
MSD++ (Multiple Delta-Sigma) converter for PCM signals
and MDSD (Multiple Double Speed DSD) principle for
DSD signals.

4Multiple Delta Sigma++(MDS++) is a technique to make
DACs parallel. The same digital signal is supplied toeach converter. The output of each DAC is combined.
The Audio signal values are added up but the conversion
error and noise are canceled. The ratio between thesignal and conversion errors increases. So the converter
performance is improved.
The improvement degree works by a square root of thenumber of DACs.
In DC-1000, all performances are improved by a factor of2.8.
As the output current of D/A Converters is very large, thenumber of I-V converters are increased to 4 circuits eachat ± output from 1 circuit each in DC-1000.
Furthermore, in I-V converters, the ANCC which is anAccuphase original technology for reducing noise anddistortion is installed.
**Refer to the Appendix for the details of ANCC
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MDSD stands for Multiple Double Speed DSD.
The DSD signals have a large amount of noise at thehigh frequency. It must be removed.
MDSD works as a low pass filter to remove the noise in
the high frequency and also works as the MDS++
principle to improve the characteristics in the lowfrequency.
The point of MDSD is the delay elements.
DSD signal in DC-1000 is D/A converted with halfdelayed clocks and is combined when it comes to theoutput.
As the analog output becomes half-clock time resolution,it allows double speed operation.
This configuration is a moving-average filter.
It works as a complete linear phase low pass filter andremoves high frequency noise of DSD signals.

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To demonstrate the superior performance of MDS++,MDSD, the DAC chips and I-V converters need to beplaced as close as possible.
In the DC-1000, DAC chip and I-V converters aremounted on the one PCB so the electrical performance isdrastically improved.
** DC-950 incorporated DAC chips and I-V converters on
2 separate PCBs.
Furthermore, the output voltage at I-V converters is set at
higher than the former DC-950, so the noise
performance is improved that the noise generated in thelatter filter amp is relatively decreased.

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The fully balanced post-filter eliminates the image noisein high frequency of D/A converter output.
The I-V converter in the D/A converter circuit works as
the 1st order low pass filter as well, and it passes throughtwo 2nd order filters inside the post-filter, so it iscomposed of 5th order low pass filter in total.
Newly-developed Dual Direct Balanced Filter that drives
two circuits of Direct Balanced Filter in parallel isinstalled at the final stage of the post-filter, it contributes
to the further improvement for noise and distortion
characteristics.
The DC-1000 is the first model that features this cuttingedge technology.
**Direct Balanced Filter is the circuit configuration thathas each independent output circuit not to mutuallyinterference the line output and balance output by theloading effect.
8The Filter amp assembly contains the post-filter
subsequent to the D/A converter.
The monophonic construction with appropriate clearance
between left channel and right channel circuits isadopted for the good channel separation.
Moreover, the power supply circuit or GND patterns also
feature the independent configurations for each channel,
and it just prevents the mutual interference.
The glass cloth fluorocarbon resin with gold-plate
processing is used for the PCB, which has excellent
high-frequency and heat-resistant characteristics.

9Ultra Low Noise is one of the main technical features ofDC-1000.
DC-1000 guarantees 123dB** Signal to Noise ratio whichmeans 1.8μV of output noise voltage.
** 0dB: 2.5V
The former model, DC-950 still shows the excellent noise
performance, however, DC-1000 achieves 10% lower
output noise voltage than DC-950.

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The Dynamic Range is the value that indicates the ratioof maximum playable signal to minimum.
The higher Dynamic Range is, the higher thereproducibility of the small signal is.
The former model, DC-950 still has the high Dynamic
range performance, however, DC-1000 achieves 2dB
higher than DC-950.
** “2dB higher” means 25% up.

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DC-1000 proves itself the great Total HermonicDistortion(THD) + Noise characteristics which are quite
important for music playback.
DC-1000 has a major improvement for this, that shows
less than 0.0001% in most frequency band.

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DC-1000 is equipped with 5 types of 8 digital inputs.
USB Input accepts 384kHz/32bit-PCM or 11.2896MHzDSD. DSD data can be received both DoP（DSD overPCM, up to 5.6448MHz） and ASIO2.1(up to11.2896MHz).
HS-LINK function supports both Ver.1 and Ver.2, the DC1000 automatically recognizes which version istransmitted.

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ANCC: “Accuphase Noise and distortion CancelingCircuit” is Accuphase unique technology to cancel thenoise and distortion generated in the amplifiers withfeedforward technique.
Output noise and distortion reduced to 1/gain come up at
the input terminal which is applied with negative
feedback.
ANCC detects the noise and distortion at the main-amp
input terminal with sub-amp, and cancels them bysubtracting from main-amp output.

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