Accuphase DC-37 User Manual

● MDSD type D/A converter using eight parallel circuits ● Direct Balanced

Filter with totally separate line and balanced signal paths ● Support for

5.6448 MHz 1-bit 2-channel DSD and 384 kHz 32-bit 2-channel PCM ● Six
digital interface inputs including HS-LINK and USB ● Phase selector for
balanced outputs ● Sampling frequency and quantization bit display for input
signal ● Separate power tra nsformer s for digital and analog sections

State-of-the-Art Digital Processor — Innovative MDSD (Multiple Double Speed DSD)
digital processing circuitry with double-speed high-precision moving-average filter
circuit configuration for straight D/A conversion of DSD signal. Support for playback
of high-resolution sources in 5.6448 MHz (1-bit 2-channel DSD) and 384 kHz (32-bit
2-channel PCM) format. Six digital inputs including HS-LINK and USB. Informative
readout shows sampling frequency and number of quantization bits of input source,
based on actual measurement.

In 2011, Accuphase introduced the ultra high-end
separate type Precision SA-CD/CD Transport DP-900
and Precision MDSD Digital Processor DC-901 combo,
which was positioned as the second entry in the

any's 40th anniversary commemorative model

comp
lineup. In 2013 Accuphase followed these with the
integrated type SA-CD/CD player DP-720 featuring a
further evolved MDSD D/A converter with support for a
variety of sources. Both the technical excellence and
stunning sound quality of these products were highly
lauded, earning them a secure place as reference
components in Japan as well as abroad.
The DC-37 inherits the outstanding technology of the
DC-901 and DP-720, while opening a new chapter in
ultra-advanced and innovative digital signal processing

technology. It features an MDSD type D/A conve
that achieves straight conversion of the DSD signal and
supports 5.6448 MHz (1-bit 2-channel DSD) sources.
In keeping with this development, the HS-LINK
interface has also been upgraded to Version 2
significantly expanded sampling frequency and
quantization support up to 5.6448 MHz (1-bit 2-channel
DSD) and 384 kHz (32-bit 2-channel PCM).
The DC-37 also offers convenience and flexible
fun

ctionality. External digital sources can be connected
via a total of six digital inputs: HS-LINK, COAXIAL 1,
COAXIAL 2, OPTICAL 1, OPTICAL 2, and USB.
Accepting digital data for example from a computer o
other components, this new standalone processor turns
the information into musical signals of unprecedented

■ Ample clean power is provided by separate power supplies

for the digital and analog sections, each with a dedicated
power transformer and large filtering capacitors.

■ Ultra-high-speed FPGA (Field Programmable Gate Array)

harnesses digital processing power to implement innovative
MDSD reproduction with double-speed high-precision
moving-average filter circuit.

■ MDS++ type D/A converter with eight circuits driven in

parallel.

One 32-bit Hyperstream™ DAC chip (ES9018 from ESS

Technology Inc.) is used per channel, each comprising eight
circuits driven in parallel. This improves overall performance
by a factor of about 3 as compared to a single converter circuit,
thereby achieving outstanding low-distortion results.

■ Direct Balanced Filter uses high-precision op-amps and

performs totally separate analog filtering for line and
balanced signal paths, to prevent any risk of interference
when both are used simultaneously.

■ Six digital inputs: HS-LINK, coaxial (2), optical (2), USB.

■ Line and balanced analog outputs (1 each). Phase selector

switch for balanced output.

Features and Functions

Assembly with MDSD and analog output circuitry

USB chipHigh-precision op-amp

Digital signal processing assembly

quality. A front panel display shows not only the sampling

rter

frequency of the selected so

urce, but also the number of
quantization bits, based on actual measurement of the
signal. Two completely separate power supplies, each

with

with a dedicated power transformer, are used for the
digital and an

alog sections, to prevent any possibility of
RF noise or electrical interference that could degrade the
sonic purity of the output.
The DC-37 is a digital processor that redefines the
state-of-the

art and has its sights firmly set on the future,
including computer-based and high-resolution audio. Only
strictly selected circuit components, materials and other

r

parts of the highest quality are used,
immense richness of information that translates into a
spectacular musical experience.

Power transfo rmer

Input selector

Assembly with 6 digital inputs

Phase selecto r

Power supply assembly

Parts selected for high sound quality and reliability

resulting in an

Digital
Inputs

Remote Commander

HS-LINK

Coaxial 1

Coaxial 2

Optical 1

Optical 2

USB

Infrared

Receiver

From

HS-LINK
Receiver

Coaxial

Receiver

Coaxial

Receiver

Optical

Receiver

Optical

Receiver

USB

Receiver

Master

Control

Computer

Key

Matrix

Interface
Decoder

Display

Block Diagram

MDSD（Multiple Double Speed DSD）System

Delay

Delay

DSD Signal

PCM Signal

MDSD（Multiple Double Speed DSD）System

Delay

Delay

DSD Signal

PCM Signal

D/A Conversion

DAC

×

D/A Conversion

DAC

×

MDS

8

MDS

8

＋＋

＋＋

5-Pole

Butterworth

Low Pass Filter

5-Pole

Butterworth

Low-Pass Filter

5-Pole

Butterworth

Low Pass Filter

5-Pole

Butterworth

Low Pass Filter

5-Pole

Butterworth

Low Pass Filter

5-Pole

Butterworth

Low Pass Filter

Line

Balanced

Line

Balanced

Left
Analog
Outputs

Right
Analog
Outputs